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  • AWS RDS connection count

    - by wmarbut
    I am using AWS RDS with MySQL for a project and have a "large" instance. The documentation is clear on what this means as far as compute resources and RAM goes, but I can't find anything that documents how many open database connections that I can have. The app that I am using is PHP and it utilizes PDO with persistent connections. This means that the number of open connections could reach the maximum number of PHP child processes running at any given point. How do I ensure that my RDS instance has a max connections setting high enough to be comfortable with this?

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  • PostgreSQL 9.1 Database Replication Between Two Production Environments with Load Balancer

    - by littleK
    I'm investigating different solutions for database replication between two PostgreSQL 9.1 databases. The setup will include two production servers on the cloud (Amazon EC2 X-Large Instances), with an elastic load balancer. What is the typical database implementation for for this type of setup? A master-master replication (with Bucardo or rubyrep)? Or perhaps use only one shared database between the two environments, with a shared disk failover? I've been getting some ideas from http://www.postgresql.org/docs/9.0/static/different-replication-solutions.html. Since I don't have a lot of experience in database replication, I figured I would ask the experts. What would you recommend for the described setup?

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  • How to get IIS7 to release a locked file?

    - by Jarrod Dixon
    During our production builds, a very large (10 megabyte) static content file in the root directory will sometimes be locked by IIS and cannot be deleted by the clean task. This is presumably because it is being actively served to one or more clients at the time. The build process stops the website before cleaning via c:\Windows\System32\inetsrv\appcmd.exe stop site http://oursite.com However, this does not release the file - we have to restart IIS to get the process to relinquish its lock. appcmd.exe allows you to take IIS down completely; we do not want to do this! Are there any other ways to get IIS to let go of a locked file, without restarting IIS? Simply stopping and starting the individual website is definitely not working to release the file lock.

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  • Problems with SCP stalling during file copy over VPN

    - by MattC
    I have a series of files I need to copy via SCP over a VPN to a remote linux server each night. The files are not large, we're talking about tens of megabytes here, but the file copy almost always stalls after a few seconds. Running the SCP command with -vvv, I see the following over and over throughout the attempted copy process: debug2: channel 0: rcvd adjust 131072 debug2: channel 0: rcvd adjust 131072 debug2: channel 0: rcvd adjust 131072 Any thoughts? I see this question being asked in various places out there, but never any answers. Any help would be appreciated.

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  • Cannot install xdebug

    - by Nathan Mann
    I'm getting a large number of undefined references when using $ld xdebug.so I have added the "zend_extension="/bla/xdebug.so"" to the conf for apache and it is giving me a config test failed because it cannot find the file. The file has been chown'd to www-data, so I do not believe it is a permissions error. I have run the wizard at xdebug.org/wizard.php to make sure the version would be correct, I updated to the version it recommended with an install from source and still receive the same error with apache and same output from $ld. I originally installed xdebug with: $apt-get install php5-xdebug And have also tried with: $pecl install xdebug

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  • Server crashes when too much memory is allocated

    - by lindenb
    Hi all, my server crashes whenever one of my users is running a 'R' script (this script requires a large amount of memory). Below is the last top I saw: top - 11:32:39 up 20 min, 4 users, load average: 1.08, 0.85, 0.46 Tasks: 336 total, 2 running, 334 sleeping, 0 stopped, 0 zombie Cpu(s): 6.1%us, 0.2%sy, 0.0%ni, 93.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.0%st Mem: 65939968k total, 5131440k used, 60808528k free, 88256k buffers Swap: 68124664k total, 0k used, 68124664k free, 1077612k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 10392 cdina 25 0 3702m 3.5g 2428 R 100.0 5.6 7:51.82 R 10430 root 15 0 12872 1272 804 R 0.7 0.0 0:02.42 top 1 root 15 0 10348 704 592 S 0.0 0.0 0:02.95 init 2 root RT -5 0 0 0 S 0.0 0.0 0:00.00 migration/0 is there a way to prevent my server from crashing ("don't run that script" is not an option :-) ) ? something like fixing a 'quota' for the memory allowed ?

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  • Extract reply to addresses from all emails in an outlook folder

    - by RodH257
    I've got to send a bulk email out to a bunch of people in reply to emails they sent me. I've got all the original emails stored in a single outlook folder. I want to extract all of the reply-to addresses from the emails in that folder so I can send an email to all of them. http://thetechieguy.wordpress.com/2008/04/22/extracting-email-address-from-outlook-2007-folder/ shows you how to export the FROM address of these emails, however a large amount of them came from a web service that sends emails 'on behalf of' the person I'm trying to mail to. So I need the reply-to address, and the export wizard doesn't do that. Does anyone have a tip on how to do this? This is Outlook 2007 on Exchange 2010.

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  • ADSIEdit freezes gettings properties of a group with hundred of thousands members

    - by ixe013
    Doing performance testing on an AD-LDS (Server 2008 R2 64 bits), we created a milion user in a single OU. We also created a single group object and made those milion users member of that group. When we try to list the milion of users ADSIEdit times out with an error message saying it cannot display that many users. Fine. But if we open the properties for the group, ADSIEdit freezes, eating up all available memory and CPU trashing (nearly 60M page faults in under an hour). AD-LDS (running on another computer) is barely hitting the 1% CPU mark, servicing other ldap requests as if nothing were. We can throw more memory at the problem, but more users will have to be managed one day and we will be back at square one. Is there a way to set a limit in ADSIEdit so that it will not hang the computer when retreving a very large multi-value object ?

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  • Perforce Restore From Multiple Checkpoint Files?

    - by AJ
    Hi all, I am working with a very large (~11GB) checkpoint file and trying to do a -jr (journal restore) operation. About half way through the file, I'm hitting an entry which causes an error to occur. I'm unable to come up with a conventional way to print, edit, and save changes to the offending line. So right now I'm splitting the checkpoint into files of 500k lines each...up to 47 files and counting. My question is, once I have these separate files: Can I run journal restore on each one separately to check for errors? Once fixed, is it necessary to merge them back together again to do my full journal restore? Any other ideas on how to tackle this problem would be appreciated. Thanks in advance, -aj

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  • mac osx cannot connect to windows 7 machine

    - by Binary X
    I have a Mac OSX (Snow Leopard 10.6.6) setup on a network with several Windows 7 machines. When trying to place a large file on a Windows share the connection to the Windows share gets lost and I am unable to reconnect until I reboot the Mac. I know this is on the Windows side because the Mac can connect and transfer files to Server 2008 and XP without issue. Looking in the log file I see this message SharePointBrowser::handleOpenCallBack returned 12 I have tried restarting the com.apple.netauth.sysagent service but that did not resolve the situation. I can do an nslookup to the Windows 7 machine, but trying to ping the machine by hostname always gives a hostname lookup failure (I can ping via IP address). I cannot connect to the machine via IP adress either. Any help would be appreciated.

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  • Ubuntu 10.04 with HD flash

    - by Brad Robertson
    Just noticed that 10.04 is out. My media server has been packed away for a few months but I might dust if off and give 10.04 a shot but I thought I'd see if anyone has any success stories with HD flash in either Chrome or Firefox. I'm currently running Ubuntu 9.10 and it was a large enough pain to get VDPAU working with my Zotac Ion-ITX-C board (eventually found an mplayer PPA that had it compiled in) From reading the 10.04 docs it looks like this is standard now, but I'm wondering about streaming HD, from, say flash or Divx. I've never been able to get HD flash to play without it being extremely choppy, and I chalk this up to the lack of hardware assisted decoding like VDPAU (a guess). My board certainly isn't a competitor in CPU power or memory, which is why i've needed the HW accelerated decoding for HD vids in the past. Just wondering if anyone has had any success stories playing HD vid online (flash, divx or what have you)

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  • nginx terminates connection after 65k bytes

    - by David Wolever
    I've got nginx configured as a front-end to a Python application running under gunicorn, but nginx is terminating connections after about 65k of data have been sent. For example, I've got a view which looks like this: def debug_big_file(request): return HttpResponse("x" * 500000) But when I access that URL through nginx, I only get 65283 bytes: $ curl https://example.com/debug/big-file | wc … curl: (18) transfer closed with outstanding read data remaining 0 1 65283 Note that everything works as expected when accessing gunicorn directly: $ curl http://localhost:1234/debug/big-file | wc … 0 1 500000 The relevant nginx config: location / { proxy_pass http://localhost:1234/; proxy_redirect off; proxy_headers_hash_bucket_size 96; } And nginx version 1.7.0 Some other facts: The number of bytes is consistent from request to request, but it varies based on the content (I first noticed it with a large PNG file, which was cut off after 65,372 bytes, not 65,283) 110k bytes are sent correctly (ie, "x" * 110000 returns all 110,000 bytes), but 120k bytes are not tcpdump suggests that nginx is sending a RST packet to gunicorn:

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  • Windows Home Server style redundancy/multi-disk-support on Windows Server 2008 R2?

    - by user19597
    I'm setting up a fileserver for our department. It'll be connected to the domain. I want it to have a very large amount of storage (several TB). Ideally, it should also preserve disk space by identifying identical files and only storing them once. It should be fault tollerant so that if one of the drives fails, that drive can be replaced without losing any data. All of these features are available in Microsoft's consumer offering - Windows Home Server. However, I can't find these kind of features within the enterprise Windows Server 2008 R2. Am I missing something? I know that I could buy a Drobo, or similar, and use this instead. However, I would prefer to use a built-in feature of Windows Server should it exist. It seems surprising to me that these features should be available in Home Server but not in an enterprise fileserver.

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  • Big square ads appear in lower right corner of both IE and Chrome

    - by BrianK
    In both IE and Chrome, large ads appear in the lower right corner of the browser window. Sometime they look reputable like for Microsoft, but sometimes they are big flashing boxes that say "You have won". Right now I am looking at "Need to lose 30 lbs?" I ran Microsofot Security Essentials and it didn't find anything. I then ran Windows Defender Offline (boot from CD). WDO found five things lincluding browser hijack that caused the wrong page to appear after clicking a link. It reported that it cleaned successfully, after which I ran a quick scan to confirm. After rebooting I still see the ads. Do I still have an infection? Any other tools to try? What about ComboFix? Thanks Update: Here's a screenshot - on superuser

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  • SQL Server 2008 Hardware Recommendation;

    - by Jay
    Hi,I work for a large fortune 500 company. We have several SQL 2005 Servers running on DELL Poweredge 2950 with 8 GB RAM and 4 CPU's. Storage is DMX RAID 10. We are in the process of migrating to sql 2008. We are planning on consolidating multiple sql 2005 into single SQL 2008 Server.If anyone can suggest hardware I would appreciate. We have looked at DELL R710, I was wondering if there are other servers that are good for running SQL 2008. Thanks

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  • Home CAT6 wiring: CMR vs CMP?

    - by Eddie Parker
    I'm planning on wiring my house with CAT6 cable. I'm finding a large jump in price between CMR and CMP cabling, and I'm confused by what counts as a 'plenum' and what does not. As I'm wiring my house, I'm planning on going through interior (hollow) walls, and through the attic and crawlspace to get to the points I wish to wire. I will be going between floors at one point, which leads me to believe I need at least CMR, and obviously CMP wouldn't hurt either. I don't mind spending the extra money if I need to, but is it overkill going for CMP if the bulk of the wires are either going vertical, or through a crawlspace or attic?

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  • Can I link proxy users from a single LDS instance to multiple domains?

    - by ixe013
    I have an Active Directory Lightweight Directory Services set up. I have objects that represent users in the Active Directory (Domain_A). I have set their objectSID attribute, and users can authenticate to LDS with their Active Directory password. I love it. I want to bring in new users, from a different Active Directory (Domain_B) that has not trust relationship whatsoever with the Active Directory from Domain_A. Is there a way to tell LDS in which domain to look for users or does it always look in the domain it is in, maybe by using another protocol than Kerberos ? +I figured out user provisionning, no need to mention it. Thanks !

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  • How do I stop IIS from sending minutely GET requests to my proxied mongrel server?

    - by brad
    I have a rails application running on Windows Server 2008 running IIS7.5. I am using Application Request Routing to send requests to the Mongrel server via IIS (I didn't want to set it up like this but this was the environment I have been forced to use). IIS seems to send a GET request to the Mongrel server once every minute. This is not a huge deal but it does cause a lot of pollution in my logs and also creates a large amount of unwanted session data. I would really like to stop it from doing this. Is there a way?

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  • Load balancing and HTTPS strategies

    - by Dan
    I am faced with the following problem: Servers get saturated since current load balancing strategy is based on client IP. Some corporate clients access our servers from behind large proxies so all clients appear with same IP to our load balancer. I think we are using some hardware load balancing device (can investigate further if necessary). We need to maintain session affinity (site is constructed in ASP), so all requests with same IP get routed to the same node. Since all the communication goes over the HTTPS, no request data (like session Id) is available to balancer as a client discriminator. Is there a way to use some other data besides the IP to distinguish between clients and route the clients even when coming from same IP to different nodes? Note: I need to maintain the traffic between the balancer and nodes safe (encrypted).

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  • Why is my ogg bigger then my m4a?

    - by acidzombie24
    i am using ffmpeg.exe -i 0123456789 -ab 192k out.m4a ffmpeg.exe -i 0123456789 -f wav - | oggenc2.exe - -r -q 6 -o out.ogg (0123456789 has no extension). My m4a output is 14,608kb while my ogg output is 19,809kb why? AFAIK -q 6 is roughly 192kb. So it should be about even. I could see one file being 1-3mb bigger then the other but 5 is pretty large. the m4a is almost 75% of the ogg! thats a lot! Why is this?

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  • Fail rate of EBS snapshots and AMIs?

    - by user784637
    According to Amazon the fail rate of EBS volumes is: As an example, volumes that operate with 20 GB or less of modified data since their most recent Amazon EBS snapshot can expect an annual failure rate (AFR) of between 0.1% – 0.5%, where failure refers to a complete loss of the volume http://aws.amazon.com/ebs/ However, I was curious to know the fail rate of EBS snapshots and private AMIs that a system admin would take. Since the EBS snapshots and AMIs are stored in Amazon s3, is it safe to assume that the likelihood you cannot rollback to a previous snapshot or AMI the same likelihood that a file gets lost in s3? Amazon S3’s standard storage is: ... Designed to provide 99.999999999% durability and 99.99% availability of objects over a given year. http://aws.amazon.com/s3/

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  • OSX: Python packages fail to install, error message "/usr/local/bin: File Exists"

    - by kylehotchkiss
    I keep trying to install django and other python packages, and I keep getting the exact same error message: Installing django-admin.py script to /usr/local/bin error: /usr/local/bin: File exists So I look to make sure that my /usr/local folder is okay. At first glance it appears okay, until I try cd-ing into my bin. It says it can't because it's not a directory. Peculiar, I thought, so then I tried a Anchorage:local khotchkiss$ ls -a -l total 26168 drwxr-xr-x 6 root wheel 204 Dec 26 20:18 . drwxr-xr-x@ 14 root wheel 476 Feb 24 12:54 .. -rwxr-xr-x@ 1 root wheel 13395080 Oct 22 23:04 bin drwxr-xr-x 8 root wheel 272 Dec 26 20:18 git drwxr-xr-x 4 root wheel 136 Dec 18 11:31 include drwxr-xr-x 12 root wheel 408 Dec 18 11:31 lib And haven't a clue of what the 'bin' is, why its so large, and why its preventing me from installing python packages. Any clue?

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  • Bind9 as a caching resolver fails with mismatch ID on localhost but not external IP

    - by argibbs
    I'm running Ubuntu 12.04 LTS on a machine on my private network. I have bind9 installed (v9.8.1-P1) via aptitude, so it appears to have put all the bits in the right places and the service starts automatically. I plan on adding some zones later, but first I'm just trying to get it working as a caching resolver. I installed bind, configured it, and starting using it. Initially I thought it was working ok, but then I found some sites weren't being resolved. I've pinned it down to being linked to the size of the result and bind failing-over to TCP mode. So: I'm trying to find out why bind is failing when I query for domain info and the result is 512 bytes (causing a truncation and retry on TCP). Specifically it fails with ID mismatches if I point dig at localhost, but works when I query the machine's own IP (192.168.0.2). This appears to be backwards to the problem that most people have when using bind (fails on external ip, works on localhost). If I do dig @localhost google.com (which has a response of <512 bytes) then it works; I get no warnings, and plenty of output. $ dig @localhost google.com ; <<>> DiG 9.8.1-P1 <<>> @localhost google.com [snip lots of output] ;; Query time: 39 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Oct 17 23:08:34 2013 ;; MSG SIZE rcvd: 495 If I do dig @localhost play.google.com (which has a larger response) then I get back something like: $ dig @localhost play.google.com ;; Truncated, retrying in TCP mode. ;; ERROR: ID mismatch: expected ID 3696, got 27130 This seems to be standard, documented behaviour - when the UDP response is large (here 'large' == 512 bytes) it falls back to TCP. The ID mismatch is not expected though. If I do dig @192.168.0.2 play.google.com then I still get the warning about using TCP mode, but it otherwise works $ dig @192.168.0.2 play.google.com ;; Truncated, retrying in TCP mode. ; <<>> DiG 9.8.1-P1 <<>> @192.168.0.2 play.google.com [snip most of the output] ;; Query time: 5 msec ;; SERVER: 192.168.0.2#53(192.168.0.2) ;; WHEN: Thu Oct 17 23:05:55 2013 ;; MSG SIZE rcvd: 521 At the moment I've not set up any zones in my local instance, so it's just acting as a caching resolver. My options config is pretty much unchanged from standard, I've got the following set: options { directory "/var/cache/bind"; allow-query { 192.168/16; 127.0.0.1; }; forwarders { 8.8.8.8; 8.8.4.4; }; dnssec-validation auto; edns-udp-size 4096 ; allow-transfer { any; }; auth-nxdomain no; # conform to RFC1035 listen-on-v6 { any; }; }; And my /etc/resolv.conf is just nameserver 127.0.0.1 search .local The problem definitely seems linked to the failover to TCP mode: if I do dig +bufsize=4096 @localhost play.google.com then it works; no warning about failover to TCP, no ID mismatch, and a standard looking result. To be honest, if there was a way to force bind to use a much larger UDP buffer, that'd probably be good enough for me, but all I've been able to find mention of is max-udp-size 4096 and that doesn't change the behaviour in any way. I've also tried setting edns-udp-size 512 in case the problem is some weird EDNS issue with my router (which seems unlikely since the +bufsize=4096 flag works fine). I've also tried dig +trace @localhost play.google.com; this works. No truncation/TCP warning, and a full result. I've also tried changing the servers used in the forwarder (e.g. to OpenDNS), but that makes no difference. There's one last data point: if I repetitively do dig @localhost play.google.com I don't always get an ID mismatch, but sometimes a REFUSED error. I'm much more likely to get a REFUSED error if I dig the non-localhost IP (192.168.0.2) first: $ dig @localhost play.google.com ;; Truncated, retrying in TCP mode. ; <<>> DiG 9.8.1-P1 <<>> @localhost play.google.com ; (1 server found) ;; global options: +cmd ;; Got answer: ;; ->>HEADER<<- opcode: QUERY, status: REFUSED, id: 35104 ;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0 ;; QUESTION SECTION: ;play.google.com. IN A ;; Query time: 4 msec ;; SERVER: 127.0.0.1#53(127.0.0.1) ;; WHEN: Thu Oct 17 23:20:13 2013 ;; MSG SIZE rcvd: 33 Any insights or things to try would be much appreciated.

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  • Do Seagate Momentus XT SSD Hybrid drives perform better than a good hard drive + flash on ReadyBoost

    - by Chris W. Rea
    Seagate has released a product called the Momentus XT Solid State Hybrid Drive. At a glance, this looks exactly like what Windows ReadyBoost attempts to do with software at the OS level: Pairing the benefits of a large hard drive together with the performance of solid-state flash memory. Does the Momentus XT out-perform a similar ad-hoc pairing of a decent hard drive with similar flash memory storage under Windows ReadyBoost? Other than the obvious "a hardware implementation ought to be faster than a software implementation", why would ReadyBoost not be able to perform as well as such a hybrid device?

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  • How to use qcow2 disk image in Linux?

    - by sauparna
    I have a large qcow2 formatted disk image, which I use as storage. Often I need to move data to and from this disk image. I mount the disk using the qemu-nbd tool as follows: modprobe nbd max_part=63 qemu-nbd -c /dev/nbd0 /host/disk100G.img mount /dev/nbd0p1 /home/rup/disk But disk access fails every now and then in the midst of some I/O operation with an "Input/output error". At that point I have to manually unmount the disk and re-mount it so that I can run the program again: qemu-nbd -d /dev/nbd0 umount joborkhaki/ What could be the reason for this? Is there a better tool that I can use to maintain a qcow2 disk image?

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