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• Remove Kernel Lock from Unmounted Mass Storage USB Device from the Command Line in Linux

  - by Casey

  I've searched high and low, and can't figure this one out. I have a older Olympus Camera (2001 or so). When I plug in the USB connection, I get the following log output: $ dmesg | grep sd [20047.625076] sd 21:0:0:0: Attached scsi generic sg7 type 0 [20047.627922] sd 21:0:0:0: [sdg] Attached SCSI removable disk Secondly, the drive is not mounted in the FS, but when I run gphoto2 I get the following error: $ gphoto2 --list-config *** Error *** An error occurred in the io-library ('Could not lock the device'): Camera is already in use. *** Error (-60: 'Could not lock the device') *** What command will unmount the drive. For example in Nautilus, I can right click and select "Safely Remove Device". After doing that, the /dev/sg7 and /dev/sdg devices are removed. The output of gphoto2 is then: # gphoto2 --list-config /Camera Configuration/Picture Settings/resolution /Camera Configuration/Picture Settings/shutter /Camera Configuration/Picture Settings/aperture /Camera Configuration/Picture Settings/color /Camera Configuration/Picture Settings/flash /Camera Configuration/Picture Settings/whitebalance /Camera Configuration/Picture Settings/focus-mode /Camera Configuration/Picture Settings/focus-pos /Camera Configuration/Picture Settings/exp /Camera Configuration/Picture Settings/exp-meter /Camera Configuration/Picture Settings/zoom /Camera Configuration/Picture Settings/dzoom /Camera Configuration/Picture Settings/iso /Camera Configuration/Camera Settings/date-time /Camera Configuration/Camera Settings/lcd-mode /Camera Configuration/Camera Settings/lcd-brightness /Camera Configuration/Camera Settings/lcd-auto-shutoff /Camera Configuration/Camera Settings/camera-power-save /Camera Configuration/Camera Settings/host-power-save /Camera Configuration/Camera Settings/timefmt Some things I've tried already are sdparm and sg3_utils, however I am unfamiliar with them, so it's possible I just didn't find the right command. Update 1: # mount | grep sdg # mount | grep sg7 # umount /dev/sg7 umount: /dev/sg7: not mounted # umount /dev/sdg umount: /dev/sdg: not mounted # gphoto2 --list-config *** Error *** An error occurred in the io-library ('Could not lock the device'): Camera is already in use. *** Error (-60: 'Could not lock the device') ***

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• Apache Bad Request "Size of a request header field exceeds server limit" with Kerberos SSO

  - by Aurelin

  I'm setting up an SSO for Active Directory users through a website that runs on an Apache (Apache2 on SLES 11.1), and when testing with Firefox it all works fine. But when I try to open the website in Internet Explorer 8 (Windows 7), all I get is "Bad Request Your browser sent a request that this server could not understand. Size of a request header field exceeds server limit. Authorization: Negotiate [ultra long string]" My vhost.cfg looks like this: <VirtualHost hostname:443> LimitRequestFieldSize 32760 LimitRequestLine 32760 LogLevel debug <Directory "/data/pwtool/sec-data/adbauth"> AuthName "Please login with your AD-credentials (Windows Account)" AuthType Kerberos KrbMethodNegotiate on KrbAuthRealms REALM.TLD KrbServiceName HTTP/hostname Krb5Keytab /data/pwtool/conf/http_hostname.krb5.keytab KrbMethodK5Passwd on KrbLocalUserMapping on Order allow,deny Allow from all </Directory> <Directory "/data/pwtool/sec-data/adbauth"> Require valid-user </Directory> SSLEngine on SSLCipherSuite ALL:!ADH:!EXPORT56:RC4+RSA:+HIGH:+MEDIUM:+LOW:+SSLv2:+EXP:+eNULL SSLCertificateFile /etc/apache2/ssl.crt/hostname-server.crt SSLCertificateKeyFile /etc/apache2/ssl.key/hostname-server.key </VirtualHost> I also made sure that the cookies are deleted and tried several smaller values for LimitRequestFieldSize and LimitRequestLine. Another thing that seems weird to me is that even with LogLevel debug I won't get any logs about this. The log's last line is ssl_engine_kernel.c(1879): OpenSSL: Write: SSL negotiation finished successfully Does anyone have an idea about that?

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• Dell Perc 6i with FreeBSD 8.1 errors with mfi0: COMMAND xxxxxxxx TIMEOUT AFTER xxx SECONDS

  - by jDempster

  We've recently bought two Dell PowerEdge R710 servers with Perc 6i controllers and 6x 135GB SAS Drives. We'd done some pretty extensive testing on a Dell PowerEdge R510 server with a Perc 6i and 4x 135GB SAS Drives running FreeBSD 8.1 for it's wonderful ZFS support and mfiutil. We hadn't had any problems with the R510 and had got to a point where we where happy with the performance of ZFS. Since running FreeBSD 8.1 on the R710 we've been getting errors from the RAID controller. mfi0: COMMAND 0xffffff80005d1770 TIMEOUT AFTER 6178 SECONDS This usually brings the system to a stand still. But it doesn't always happen, and performs very well up until it does happen. We've been running the disk as 3 mirrored drives striped in ZFS. So far we've noticed that running the drives with RAID10 on the RAID seems to work without errors (still testing). At first I thought hardware error as we'd been running FreeBSD on the R510 with the same controller without any issues. But both R710 have the same issue. All controllers are running the same firmware.

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• DNS slow after losing DNS Server

  - by Tim

  We have set up a small Windows Server 2008 R2 network with a domain controller which is also acting as the DNS server for the network (we opted to install DNS when setting up the domain). This network isn't connected to the Internet in any way, so all machines have been configured to use the IP address of the domain controller as their primary DNS and no secondary DNS server has been configured. If we shut down or unplug the network cable from the domain controller, DNS lookups become quite slow and the performance of the network suffers. For example, running a ping command using a hostname takes around 5-6 seconds to resolve the name. I presume this is because it is looking for the DNS, then falling back to some other method of resolving the names as the DNS server is now gone. All the machines have static IP addresses so we are considering just putting all entries in the HOSTS file of each machine. However, it would be nice to have a centralised DNS in case we one day change the IP of one of the machines. Is there a better way to speed this up?

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• Use RAID for desktop computer?

  - by NickAldwin

  I'm building a new computer over the summer. I'm fairly competent in computer hardware, and am thus building the computer from scratch. I have everything planned out, but I was wondering if I should consider RAID/what RAID to use. I plan to purchase 2x1TB drives. Currently I'm leaning toward RAID 1 for the redundancy -- I've heard newer super-capacity drives fail more often than one would think, and I don't want to have a problem and lose all my data. What do you think? My mobo supports RAID 0/1/5/10. Is it worth it to use RAID at all, or should I just use a backup service like Mozy? Should I consider RAID 0 instead, for the performance? I'm kind-of going back and forth on this one. Thanks a lot for your help. EDIT: I'd like to avoid the OS drive different from Data drive situation, because that can get frustrating when programs like to store a lot of data in their program files folder. I've lived with that situation before and it gets annoying after a while.

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• pfSense Firewall or Linsys/Cisco router for small offices

  - by Tim Meers

  I'm about to start switching some networks around for multiple small offices. Each office has about 10 to 15 users and 10 to 15 computers. Each office has a spread of generic routers and access points. The routers vary from being used as routers, to just being an access point for wireless. Nothing formal has really ever beem implemented for each of the 10 offices. What I'm wanting is to set up a pfSense box for each office to configure things like: traffic shaping (for VoIP QOS) URL Filtering DHCP static routing multiple VLANs I'll then use some of the existing hardware for wireless. Maybe even integrate the wireless right into the firewall depending on the office layout. So my question, would this be better to do a full blown firewall box, or but a new business class or high end consumer class Linksys router to do the URL filtering, QOS and DHPC? Each option could allow for remote access and VPN for remote maintnance and each would only cost a nominal about of money for something decent, i.e. under $250.

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• What is there in Win 7 Pro (or Ultimate) that is not there in Home Premium? - Especially considering this situation..

  - by Senthil

  I want to know the REAL difference between Windows 7 Home Premium and Professional/Utimate. In India, the cost of different versions: Ultimate - 11,200 INR Professional - 10,700 INR Home Premium - 6,600 INR The absolute cost of the first two is so high to me that the difference (500 INR) doesn't matter. So to me there is really no choice between the first two - If I decide to buy the Professional version, I'd rather go for Ultimate itself. What I want to know is, whether Home Premium is enough for my needs. I tried searching for comparison but many look like just marketing junk from MS. They are short and vague. According to this page, the major differences between Pro and HomePremium are Run many Windows XP productivity programs in Windows XP Mode. Connect to company networks easily and more securely with Domain Join. You can do both in Pro but not in Home Premium. I intend to use my Windows 7 for a small business - just starting up. So I'll be dealing with the following: All kinds of development tools, servers Very important - I will run Virtual Machine Software (MS VPC or VMWare or Sun VirtualBox etc..) My system will be acting as the server for most purposes till I can afford dedicated servers. Connect the system to a variety of network devices (PCs, Printers, etc..) Run productivity, business and financial apps Any other small software startup business requirement that I haven't thought of yet. Professional (and Ultimate) is twice as expensive as Home Premium. So it'd be great if someone can point out the things you cannot do with Home Premium, when you use it like I explained above, so that I can make a decision about which one to buy. I need some real-life experiences so that I can make an informed decision - not a decision based on marketing junk.

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• QoS basics on a Cisco ASA

  - by qbn

  Could someone briefly explain how to use QoS on Cisco ASA 5505? I have the basics of policing down, but what about shaping and priorities? Basically what I'm trying to do is carve out some bandwidth for my VPN subnets (in an object-group called priority-traffic). I've seen this Cisco QoS document, however configuring shaping and priority-queue don't seem to have any effects in my test. A full download of the linux kernel from kernel.org will boost a ping to a server via VPN sky high. Policing has been successful in passing this test, although it doesn't seem as efficient (I cap non-vpn traffic at 3 of my 4.5 megabits of bandwidth). Am I misunderstanding the results of the test? I think there is some simple concept I'm not grasping here. EDIT: Here is my config thus far (I have 4.5 megabits of bandwidth): access-list priority-traffic extended permit ip object-group priority-traffic any access-list priority-traffic extended permit ip any object-group priority-traffic access-list priority-traffic extended permit icmp object-group priority-traffic any access-list priority-traffic extended permit icmp any object-group priority-traffic access-list non-priority-traffic extended deny ip object-group priority-traffic any access-list non-priority-traffic extended deny ip any object-group priority-traffic access-list non-priority-traffic extended permit ip any any priority-queue outside queue-limit 440 class-map non-priority-traffic match access-list non-priority-traffic class-map priority-traffic match access-list priority-traffic class-map inspection_default match default-inspection-traffic policy-map type inspect dns preset_dns_map parameters message-length maximum 512 policy-map global_policy class inspection_default inspect dns preset_dns_map inspect ftp inspect h323 h225 inspect h323 ras inspect rsh inspect rtsp inspect sqlnet inspect skinny inspect sunrpc inspect xdmcp inspect sip inspect netbios inspect tftp policy-map outbound-qos-policy class non-priority-traffic police input 2500000 police output 2500000 class priority-traffic priority service-policy global_policy global service-policy outbound-qos-policy interface outside

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• How can I forward an application with X11 in grayscale

  - by ??????? ???????????

  I am trying to run a graphical application at home and display it on a it on a laptop which is located about six routing hops away. The problem is that the connection is so slow (or rather there is so much GOOEY being transfered) that the mouse is unresponsive and it takes a "long time" to redraw the window even at a resolution of 800x600 pixels. The connection speeds are 10MBit up at home and about 1MBit down on the laptop, which I think should be sufficient for looking at some GUI in (almost) real time. Since this traffic is sent over over a secure shell, I have enabled Compression with highest CompressionLevel along with Ciphers set to blowfish-cbc. This has substantially improved the responsiveness of the application, making it nearly usable. However, my goal is to improve the performance even further by sacrificing colors and even frame rate. The application to be displayed a Qemu SDL window with a graphically-oriented OS in it. This is not strictly relevant, but perhaps there are options to tweak the SDL output which I am not aware of. A possible workaround would be to run the application in a "hidden" X server and enabling TigerVNC on that X server. This would automatically give me the benefits of an optimized VNC viewport, but the goal is to do without (reduce complexity). The question I'm asking is what are my options for reducing the data-rate generated on the server in order to make the graphical application more usable on the client. As mentioned, colors are not important and I could probably work with 5-16 fps. Both machines are running Gentoo with the software in question being: workstation X.Org X Server 1.10.4 OpenSSH_5.8p1-hpn13v10, OpenSSL 1.0.0e QEMU emulator version 0.15.1 (qemu-kvm-0.15.1) laptop X.Org X Server 1.12.2 OpenSSH_5.8p1-hpn13v10lpk, OpenSSL 1.0.0j

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• Unexplained CPU and Disk activity spikes in SQL Server 2005

  - by Philip Goh

  Before I pose my question, please allow me to describe the situation. I have a database server, with a number of tables. Two of the biggest tables contain over 800k rows each. The majority of rows are less than 10k in size, though roughly 1 in 100 rows will be 1 MB but <4 MB. So out of the 1.6 million rows, about 16000 of them will be these large rows. The reason they are this big is because we're storing zip files binary blobs in the database, but I'm digressing. We have a service that runs constantly in the background, trimming 10 rows from each of these 2 tables. In the performance monitor graph above, these are the little bumps (red for CPU, green for disk queue). Once ever minute we get a large spike of CPU activity together with a jump in disk activity, indicated by the red arrow in the screenshot. I've run the SQL Server profiler, and there is nothing that jumps out as a candidate that would explain this spike. My suspicion is that this spike occurs when one of the large rows gets deleted. I've fed the results of the profiler into the tuning wizard, and I get no optimisation recommendations (i.e. I assume this means my database is indexed correctly for my current workload). I'm not overly worried as the server is coping fine in all circumstances, even under peak load. However, I would like to know if there is anything else I can do to find out what is causing this spike? Update: After investigating this some more, the CPU and disk usage spike was down to SQL server's automatic checkpoint. The database uses the simple recovery model, and this truncates the log file at each checkpoint. We can see this demonstrated in the following graph. As described on MSDN, the checkpoints will occur when the transaction log becomes 70% full and we are using the simple recovery model. This has been enlightening and I've definitely learned something!

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• Ubuntu virtual memory caches suck up memory

  - by Tom

  Hey all, I've got an Ubuntu 9.10 64-bit server that seems to use up all available memory. According to my munin graphs, almost all of the memory used up is in the swap cache, cache, and slab cache. (I take this to mean virtual memory caches, am I right in assuming this?) Once memory usage approaches 100%, some (although not all) system services such as SSH become sluggish and unresponsive. After rebooting the system, performance and memory usage become normal for a time. Some interesting tidbits: The system runs Apache 2, MySQL, Munin, and sshd. The memory usage spikes happen at the same time every night (at 10 PM sharp.) There appears to be nothing in the crontab for any of the users, and nothing in /etc/cron.d/* out of the ordinary, let alone something that would occur at 10 PM. My question is, how do I figure out what is causing the memory suckage? I've tried the usual utilities (e.g. ps, top, etc) but I can't seem to find anything unusual. Any ideas? Thanks in advance!

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• Reverse proxy for mailserver (SMTP + HTTP for web client)

  - by gaqzi

  I'm looking at doing some reverse proxy work for a mail server with corresponding web client. Both servers are running on the same machine, this is not a server with a high load. :) The solution I've discussed with friends is having the mail server/web client on our internal network. Then to put a reverse proxy on the DMZ to service both SMTP and web client HTTP-traffic to the mail server on the internal network. From what I understand this is the recommended secure solution? So far I've thought for the SMTP-proxy part of using postfix which will receive mail, do some spamhause and similar anti-spam measures and if it all checks out, send the mail to the mail server on the inside. The mail server on the inside will send all outgoing mail to the proxy which will then send it out on the Internet. For the web client I'm not sure exactly which software I should be running on the proxy machine, I've been thinking about using Squid -- but that's basically based on the fact that I know squid is a http proxy. The web client data will be sent out over SSL. Reading around some here on Serverfault I've seen other people using Apache with mod_proxy+mod_security for similar situations. Am I thinking correctly for this solution? What software would you guys use and with which modules? Thanks in advance for the help! :)

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• Remove Kernel Lock from Unmounted Mass Storage USB Device from the Command Line in Linux

  - by Casey

  I've searched high and low, and can't figure this one out. I have a older Olympus Camera (2001 or so). When I plug in the USB connection, I get the following log output: $ dmesg | grep sd [20047.625076] sd 21:0:0:0: Attached scsi generic sg7 type 0 [20047.627922] sd 21:0:0:0: [sdg] Attached SCSI removable disk Secondly, the drive is not mounted in the FS, but when I run gphoto2 I get the following error: $ gphoto2 --list-config *** Error *** An error occurred in the io-library ('Could not lock the device'): Camera is already in use. *** Error (-60: 'Could not lock the device') *** What command will unmount the drive. For example in Nautilus, I can right click and select "Safely Remove Device". After doing that, the /dev/sg7 and /dev/sdg devices are removed. The output of gphoto2 is then: # gphoto2 --list-config /Camera Configuration/Picture Settings/resolution /Camera Configuration/Picture Settings/shutter /Camera Configuration/Picture Settings/aperture /Camera Configuration/Picture Settings/color /Camera Configuration/Picture Settings/flash /Camera Configuration/Picture Settings/whitebalance /Camera Configuration/Picture Settings/focus-mode /Camera Configuration/Picture Settings/focus-pos /Camera Configuration/Picture Settings/exp /Camera Configuration/Picture Settings/exp-meter /Camera Configuration/Picture Settings/zoom /Camera Configuration/Picture Settings/dzoom /Camera Configuration/Picture Settings/iso /Camera Configuration/Camera Settings/date-time /Camera Configuration/Camera Settings/lcd-mode /Camera Configuration/Camera Settings/lcd-brightness /Camera Configuration/Camera Settings/lcd-auto-shutoff /Camera Configuration/Camera Settings/camera-power-save /Camera Configuration/Camera Settings/host-power-save /Camera Configuration/Camera Settings/timefmt Some things I've tried already are sdparm and sg3_utils, however I am unfamiliar with them, so it's possible I just didn't find the right command. Update 1: # mount | grep sdg # mount | grep sg7 # umount /dev/sg7 umount: /dev/sg7: not mounted # umount /dev/sdg umount: /dev/sdg: not mounted # gphoto2 --list-config *** Error *** An error occurred in the io-library ('Could not lock the device'): Camera is already in use. *** Error (-60: 'Could not lock the device') ***

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• SSL on nginx + unicorn got "Error 102 (net::ERR_CONNECTION_REFUSED)"

  - by panggi

  I tried to deploy my app on EC2 (opened port: 22, 80, 443) App: Rails 3.2.2 Server: nginx 1.2.1 unicorn gem (latest) ubuntu 12.04 Deployer: Capistrano I tried to follow the instruction in Railscasts : http://railscasts.com/episodes/335-deploying-to-a-vps (Sorry, it's a Pro Episode) Anything fine with normal port 80 http but i got Error 102 after trying to use SSL, here is the nginx.conf content: upstream unicorn { server unix:/tmp/unicorn.frontend.sock fail_timeout=0; } server { server_name beta.sukeru.com; listen 443 default; root /home/deployer/apps/appname/current/public; ssl on; ssl_certificate server.crt; ssl_certificate_key server.key; ssl_session_timeout 5m; ssl_protocols SSLv2 SSLv3 TLSv1; ssl_ciphers HIGH:!aNULL:!MD5; ssl_prefer_server_ciphers on; location / { proxy_set_header Host $host; proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for; proxy_set_header X-Forwarded-Proto https; proxy_redirect off; proxy_pass http://unicorn; } error_page 500 502 503 504 /500.html; } In production.rb i set: config.force_ssl = true Can anyone give a solution for this? :)

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• Hardware reserved memory issue

  - by Robert Koritnik

  I've seen lots of folks having problem with hardware reserved memory issue in Windows 7/Server 2008 R2. I have it myself but not as huge as others have. Problem description When you install Windows 7 (or its bigger brother Windows Server 2008 R2) your memory may not be fully utilised. If you look at Task Manager > Performance Tab > Resource Monitor > Memory Tab And scroll to the bottom of the list you will see a graphical representation of your memory. Some of it may be hardware reserved. Previous Windows versions didn't have this problem. System was able to utilise all memory available. Question Is there any solution to lower/remove hardware reserved memory? Sidenote I tried installing 32 and 64 bit versions but to no avail. I also tried both Windows: 7 and Server 2008 R2. But always get the same amount reserved by HW. On previous Windows versions I had more memory available because I'm simultaneously running 2 VMs on host (so three machines all together). And my memory peaks much higher now as it did on older versions.

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• ssl_error_rx_record_too_long connection error with SSL site in Firefox

  - by Thomas

  I am trying to set up SSL in Apache but when I go to the server in Firefox I get the following error message: An error occurred during a connection to sludge.home. SSL received a record that exceeded the maximum permissible length. (Error code: ssl_error_rx_record_too_long) My virtual host config file looks like this. <IfDefine SSL> <VirtualHost *:443> ServerName sludge.home SSLEngine on SSLCertificateFile /usr/local/apache/cert/server.crt SSLCertificateKeyFile /usr/local/apache/cert/server.pem SSLProtocol -SSLv2 SSL CipherSuite HIGH:!ADH:!EXP:!MD5:!NULL DocumentRoot "/usr/local/apache/htdocs" ServerAdmin [email protected] <Location /> AuthType Digest AuthName "private area" AuthDigestDomain / AuthDigestProvider file AuthUserFile /usr/local/apache/passwd/digest_pw Require valid-user </Location> <Directory /usr/local/apache/htdocs/bugz> AddHandler cgi-script .cgi Options +Indexes +ExecCGI DirectoryIndex index.cgi AllowOverride Limit FileInfo Indexes </Directory> <Directory /usr/local/apache/htdocs/bugzilla> AddHandler cgi-script .cgi Options +Indexes +ExecCGI DirectoryIndex index.cgi AllowOverride Limit FileInfo Indexes </Directory> <Directory /> Options FollowSymLinks AllowOverride None Order deny,allow Deny from all </Directory> <Directory "/usr/local/apache/htdocs"> Options Indexes FollowSymLinks Allow Override None Order allow,deny Allow from all </Directory> <IfModule dir_module> DirectoryIndex index.html </IfModule> <FilesMatch "^\.ht"> Order allow,deny Deny from all Satisfy All </FilesMatch> </VirtualHost> </IfDefine> A telnet to this server reveals that server is sending plain HTML back. Further more it seems as though mod_ssl is not loaded/working even though when I httpd -l it shows up as being statically compiled in. I have exhausted most avenues I can think of.

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• SSL Certifcate Request s2003 DC CA DNS Name not Avaiable.

  - by Beuy

  I am trying to submit a request for an SSL certificate on a Domain Controller in order to enable LDAP SSL, and having no end of problems. I am following the information provided at http://support.microsoft.com/default.aspx?scid=kb;en-us;321051 & http://adldap.sourceforge.net/wiki/doku.php?id=ldap_over_ssl Steps taken so far: Create Servername.inf with the following information ;----------------- request.inf ----------------- [Version] Signature="$Windows NT$ [NewRequest] Subject = "CN=servername.domain.loc" ; replace with the FQDN of the DC KeySpec = 1 KeyLength = 1024 ; Can be 1024, 2048, 4096, 8192, or 16384. ; Larger key sizes are more secure, but have ; a greater impact on performance. Exportable = TRUE MachineKeySet = TRUE SMIME = False PrivateKeyArchive = FALSE UserProtected = FALSE UseExistingKeySet = FALSE ProviderName = "Microsoft RSA SChannel Cryptographic Provider" ProviderType = 12 RequestType = PKCS10 KeyUsage = 0xa0 [EnhancedKeyUsageExtension] OID=1.3.6.1.5.5.7.3.1 ; this is for Server Authentication ;----------------------------------------------- Create Certificate request by running: certreq -new Servername.inf Servername.req Attempt to submit Certificate request to CA by running: certreq -submit -attrib "CertificateTemplate: DomainController" request.req At which point I get the following error: The DNS name is unavailable and cannot be added to the Subject Alternate Name. 0x8009480f (-2146875377) Trouble shooting steps I have taken so far 1. Modify the Domain Controller Template to supply Subject Name in Request restart Certificate Service, include SAN in Request, same error. 2. Re-installed Certificate Services / IIS / Restarted machine countless times Any help resolving the issue would be greatly appreciated.

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• Outgrew MongoDB … now what?

  - by samsmith

  We dump debug and transaction logs into mongodb. We really like mongodb because: Blazing insert perf document oriented Ability to let the engine drop inserts when needed for performance But there is this big problem with mongodb: The index must fit in physical RAM. In practice, this limits us to 80-150gb of raw data (we currently run on a system with 16gb RAM). Sooooo, for us to have 500gb or a tb of data, we would need 50gb or 80gb of RAM. Yes, I know this is possible. We can add servers and use mongo sharding. We can buy a special server box that can take 100 or 200 gb of RAM, but this is the tail wagging the dog! We could spend boucoup $$$ on hardware to run FOSS, when SQL Server Express can handle WAY more data on WAY less hardware than Mongo (SQL Server does not meet our architectural desires, or we would use it!) We are not going to spend huge $ on hardware here, because it is necessary only because of the Mongo architecture, not because of the inherent processing/storage needs. (And sharding? Please! Cost aside, who needs the ongoing complexity of three, five, or more servers to manage a relatively small load?) Bottom line: MongoDB is FOSS, but we gotta spend $$$$$$$ on hardware to run it? We sould rather buy commercial SW! I am sure we are not the first to hit this issue, so we ask the community: Where do we go next? (We already run Mongo v2) Thanks!!

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• Subversion gives Error 500 until authenticating with a web browser

  - by Farseeker

  We used to use Collabnet SVN/Apache combo on a Windows server with LDAP authentication, and whilst the performance wasn't brilliant it used to work perfectly. After switching to a fresh Ubuntu 10 install, and setting up an Apache/SVN/LDAP configuration, we have HTTPS access to our repositories, using Active Directory authentication via LDAP. We're now having a very peculiar issue. Whenever a new user accesses a repository, our SVN clients (we have a few depending on the tool, but for arguments sake, let's stick to Tortoise SVN) report "Error 500 - Unknown Response". To get around this, we have to log into the repo using a web browser and navigate 'backwards' until it works E.G: SVN Checkout https://svn.example.local/SVN/MyRepo/MyModule/ - Error 500 (bad) Webbrowse to https://svn.example.local/SVN/MyRepo/MyModule/ - Error 500 (bad) Webbrowse to https://svn.example.local/SVN/MyRepo/ - Error 500 (bad) Webbrowse to https://svn.example.local/SVN/ - Forbidden 403 (correct) Webbrowse to https://svn.example.local/SVN/MyRepo/ - OK 200 (correct) SVN Checkout https://svn.example.local/SVN/MyRepo/MyModule/ - Error 500 (bad) Webbrowse to https://svn.example.local/SVN/MyRepo/MyModule/ - OK 200 (correct) SVN Checkout https://svn.example.local/SVN/MyRepo/MyModule/ - OK 200 (correct) It seems to require authentication up the tree, starting from the svnparentpath up through to the module required. Has anyone seen anything like this before? Any ideas on where to start before I ditch it back to Collabnet's SVN server?

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• Windows Audio Issue

  - by Nikki

  This one is driving me nuts. Hoping someone can shed some light. I'm running windows 7 using onboard audio. It's been fine for over 2 years but lately there's a problem every time I play audio. I hear a small soft burst of static and the volume turns itself down from 50% to 23%. Once at 23%, it plays fine. No related events logged in viewer. No reported problems with the device. Different headphones, same problem. I played around with audio settings for hours but the problem persists. EDIT: ok more info: Motherboard: ECS G31T-M LGA775 System info displays this: Name High Definition Audio Device Manufacturer Microsoft Status OK PNP Device ID HDAUDIO\FUNC_01&VEN_1106&DEV_E721&SUBSYS_10192683&REV_1001\4&3D4E739&0&0001 Driver c:\windows\system32\drivers\hdaudio.sys (6.1.7600.16385, 297.00 KB (304,128 bytes), 14/07/2009 9:51 AM) I'll keep adding info as I find it. The question I want resolved is; Is it faulty hardware? If so, I can buy a sound card. I can't imagine software is responsible since I haven't installed anything new for weeks. Virus scans are clear as well. The static burst is irritating to say the least. Tried 2 different headphones and separate speakers. Same problem. I know it's not an easy problem but I was hoping someone had encountered the same thing.

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• Apache not Forwarding Client x509 Certificate to Tomcat via mod_proxy

  - by hooknc

  Hi Everyone, I am having difficulties getting a client x509 certificate to be forwarded to Tomcat from Apache using mod_proxy. From observations and reading a few logs it does seem as though the client x509 certificate is being accepted by Apache. But, when Apache makes an SSL request to Tomcat (which has clientAuth="want"), it doesn't look like the client x509 certificate is passed during the ssl handshake. Is there a reasonable way to see what Apache is doing with the client x509 certificate during its handshake with Tomcat? Here is the environment I'm working with: Apache/2.2.3 Tomcat/6.0.29 Java/6.0_23 OpenSSL 0.9.8e Here is my Apache VirtualHost SSL config: <VirtualHost xxx.xxx.xxx.xxx:443> ServerName xxx ServerAlias xxx SSLEngine On SSLProxyEngine on ProxyRequests Off ProxyPreserveHost On ErrorLog logs/ssl_error_log TransferLog logs/ssl_access_log LogLevel debug SSLProtocol all -SSLv2 SSLCipherSuite ALL:!ADH:!EXPORT:!SSLv2:RC4+RSA:+HIGH:+MEDIUM:+LOW SSLCertificateFile /usr/local/certificates/xxx.crt SSLCertificateKeyFile /usr/local/certificates/xxx.key SSLCertificateChainFile /usr/local/certificates/xxx.crt SSLVerifyClient optional_no_ca SSLOptions +ExportCertData CustomLog logs/ssl_request_log \ "%t %h %{SSL_PROTOCOL}x %{SSL_CIPHER}x \"%r\" %b" <Proxy *> AddDefaultCharset Off Order deny,allow Allow from all </Proxy> ProxyPass / https://xxx.xxx.xxx.xxx:8443/ ProxyPassReverse / https://xxx.xxx.xxx.xxx:8443/ </VirtualHost> Then here is my Tomcat SSL Connector: <Connector port="8443" protocol="HTTP/1.1" SSLEnabled="true" address="xxx.xxx.xxx.xxx" maxThreads="150" scheme="https" secure="true" keystoreFile="/usr/local/certificates/xxx.jks" keypass="xxx_pwd" clientAuth="want" sslProtocol="TLSv1" proxyName="xxx.xxx.xxx.xxx" proxyPort="443" /> Could there possibly be issues with SSL Renegotiation? Could there be problems with the Truststore in our Tomcat instance? (We are using a non-standard Truststore that has partner organization CAs.) Is there better logging for what is happening internally with Apache for SSL? Like what is happening to the client cert or why it isn't forwarding the certificate when tomcats asks for one? Any reasonable assistance would be greatly appreciated. Thank you for your time.

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• "Windows detected a hard drive" issue in Windows 7 x64

  - by Jasiu

  I upgraded to the OCZ-Agility3 120GB from a 60 OCZ Vertex2 SSD. I cloned the drive from the Vertex to the new Agility. Everything seemed to have gone well and have not had any problems. Recently in the passed month I have gotten this error: I downloaded teh OCZToolboxMP and ran the SMART utility and don't see anything wrong: SMART READ DATA ModelNumber : OCZ-AGILITY3 Serial Number : OCZ-Y1945X77438P4NU6 WWN : 5-e8-3a-97 ebea5ba76 Revision: 10 Attributes List 1: SSD Raw Read Error Rate Normalized Rate: 70 total ECC and RAISE errors 5: SSD Retired Block Count Reserve blocks remaining: 100% 9: SSD Power-On Hours Total hours power on: 968 12: SSD Power Cycle Count Count of power on/off cycles: 28 171: SSD Program Fail Count Total number of Flash program operation failures: 0 172: SSD Erase Fail Count Total number of Flash erase operation failures: 0 174: SSD Unexpected power loss count Total number of unexpected power loss: 11 177: SSD Wear Range Delta Delta between most-worn and least-worn Flash blocks: 0 181: SSD Program Fail Count Total number of Flash program operation failures: 0 182: SSD Erase Fail Count Total number of Flash erase operation failures: 0 187: SSD Reported Uncorrectable Errors Uncorrectable RAISE errors reported to the host for all data access: 4145 194: SSD Temperature Monitoring Current: 30 High: 30 Low: 30 195: SSD ECC On-the-fly Count Normalized Rate: 120 196: SSD Reallocation Event Count Total number of reallocated Flash blocks: 100 201: SSD Uncorrectable Soft Read Error Rate Normalized Rate: 120 204: SSD Soft ECC Correction Rate (RAISE) Normalized Rate: 120 230: SSD Life Curve Status Current state of drive operation based upon the Life Curve: 100 231: SSD Life Left Approximate SDD life Remaining: 100% 241: SSD Lifetime writes from host lifetime writes 893 GB 242: SSD Lifetime reads from host lifetime reads 968 GB Does anyone have any ideas of what might be wrong and or how I can go about fixing this? Please let me know if there is other information I can provide. Thanks for your help Windows 7 x64 SP1 AMD Phenom II X4 940 8GB RAM

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• Large virtual memory size of ElasticSearch JVM

  - by wfaulk

  I am running a JVM to support ElasticSearch. I am still working on sizing and tuning, so I left the JVM's max heap size at ElasticSearch's default of 1GB. After putting data in the database, I find that the JVM's process is showing 50GB in SIZE in top output. It appears that this is actually causing performance problems on the system; other processes are having trouble allocating memory. In asking the ElasticSearch community, they suggested that it's "just" filesystem caching. In my experience, filesystem caching doesn't show up as memory used by a particular process. Of course, they may have been talking about something other than the OS's filesystem cache, maybe something that the JVM or ElasticSearch itself is doing on top of the OS. But they also said that it would be released if needed, and that didn't seem to be happening. So can anyone help me figure out how to tune the JVM, or maybe ElasticSearch itself, to not use so much RAM. System is Solaris 10 x86 with 72GB RAM. JVM is "Java(TM) SE Runtime Environment (build 1.7.0_45-b18)".

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• How does it hurt to use Linux (Ubuntu) as a guest OS for all my tasks?

  - by sauparna

  I have a machine running Windows, where the disk has two partitions C (50 GB) and D (250GB). I do research in Information Retrieval and need to work with a large corpus (more than 50 GB) and in Linux. So if I want to install Linux on the existing system, keeping the Windows installation intact, will it be fine to run it in a virtual box? (say, QEMU, VMWare, etc.) An alternative is using Wubi. In that case the Linux installation has to be on drive C. Then, if I keep a small Linux installation (say 5GB) on C, and my corpus on D (mounted in Linux), how will it affect the performance of my programs which would be accessing the mounted Windows drive D. Is it feasible to use Linux this way? Which of the above is better if at all they are a way out? Note : Since my post in July 2010, I have been using and have tried several ways of maintaining a disk-image that I can mount in Linux. I had a 100GB qcow2 disk and a 100GB raw disk, both formatted to an EXT3 file system. I was mounting and connecting to the qcow2 disk using qemu-nbd. The problem was that every now and then, the connection to the disk would get lost and the running programs would throw disk I/O errors. The raw disk would mount and work fine as a loop mounted device, but when writing data to it, the mount.ntfs program would hog the CPU and the process would take an enormous amount of time. I was in fact running make on a piece of software located on this raw disk, and after a point of time make was waiting while mount.ntfs would show 100% CPU usage.

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• Why datacenter water cooling is not widespread?

  - by MainMa

  From what I read and hear about datacenters, there are not too many server rooms which use water cooling, and none of the largerst datacenters use water cooling (correct me if I'm wrong). Also, it's relatively easy to buy an ordinary PC components using water cooling, while water cooled rack servers are nearly nonexistent. On the other hand, using water can possibly (IMO): Reduce the power consumption of large datacenters, especially if it is possible to create direct cooled facilities (i.e. the facility is located near a river or the sea). Reduce noise, making it less painful for humans to work in datacenters. Reduce space needed for the servers: On server level, I imagine that in both rack and blade servers, it's easier to pass the water cooling tubes than to waste space to allow the air to pass inside, On datacenter level, if it's still required to keep the alleys between servers for maintenance access to servers, the empty space under the floor and at the ceiling level used for the air can be removed. So why water cooling systems are not widespread, neither on datacenter level, nor on rack/blade servers level? Is it because: The water cooling is hardly redundant on server level? The direct cost of water cooled facility is too high compared to an ordinary datacenter? It is difficult to maintain such system (regularly cleaning the water cooling system which uses water from a river is of course much more complicated and expensive than just vacuum cleaning the fans)?

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