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  • How does IPv6 subnetting work and how does it differ from IPv4 subnetting?

    - by Michael Hampton
    This is a Canonical Question about IPv6 Subnetting. Related: How does IPv4 Subnetting Work? I know a lot about IPv4 Subnetting, and as I prepare to (deploy|work on) an IPv6 network I need to know how much of this knowledge is transferable and what I still need to learn. IPv6 seems at first glance to be much more complex than IPv4. So I would like to know: IPv6 is 128 bits, so why is /64 the smallest recommended subnet for hosts? Related to this: Why is it recommended to use /127 for point to point links between routers, and why was it recommended against in the past? Should I change existing router links to use /127? Why would virtual machines be provisioned with subnets smaller than /64? Are there other situations in which I would use a subnet smaller than /64? Can I map directly from IPv4 subnets to IPv6 subnets? My interfaces have several IPv6 addresses. Must the subnet be the same for all of them? Why do I sometimes see a % rather than a / in an IPv6 address and what does it mean? Am I wasting too many subnets? Aren't we just going to run out again? In what other major ways is IPv6 subnetting different from IPv4 subnetting?

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  • Slow Memcached: Average 10ms memcached `get`

    - by Chris W.
    We're using Newrelic to measure our Python/Django application performance. Newrelic is reporting that across our system "Memcached" is taking an average of 12ms to respond to commands. Drilling down into the top dozen or so web views (by # of requests) I can see that some Memcache get take up to 30ms; I can't find a single use of Memcache get that returns in less than 10ms. More details on the system architecture: Currently we have four application servers each of which has a memcached member. All four memcached members participate in a memcache cluster. We're running on a cloud hosting provider and all traffic is running across the "internal" network (via "internal" IPs) When I ping from one application server to another the responses are in ~0.5ms Isn't 10ms a slow response time for Memcached? As far as I understand if you think "Memcache is too slow" then "you're doing it wrong". So am I doing it wrong? Here's the output of the memcache-top command: memcache-top v0.7 (default port: 11211, color: on, refresh: 3 seconds) INSTANCE USAGE HIT % CONN TIME EVICT/s GETS/s SETS/s READ/s WRITE/s cache1:11211 37.1% 62.7% 10 5.3ms 0.0 73 9 3958 84.6K cache2:11211 42.4% 60.8% 11 4.4ms 0.0 46 12 3848 62.2K cache3:11211 37.5% 66.5% 12 4.2ms 0.0 75 17 6056 170.4K AVERAGE: 39.0% 63.3% 11 4.6ms 0.0 64 13 4620 105.7K TOTAL: 0.1GB/ 0.4GB 33 13.9ms 0.0 193 38 13.5K 317.2K (ctrl-c to quit.) ** Here is the output of the top command on one machine: ** (Roughly the same on all cluster machines. As you can see there is very low CPU utilization, because these machines only run memcache.) top - 21:48:56 up 1 day, 4:56, 1 user, load average: 0.01, 0.06, 0.05 Tasks: 70 total, 1 running, 69 sleeping, 0 stopped, 0 zombie Cpu(s): 0.0%us, 0.0%sy, 0.0%ni, 99.7%id, 0.0%wa, 0.0%hi, 0.0%si, 0.3%st Mem: 501392k total, 424940k used, 76452k free, 66416k buffers Swap: 499996k total, 13064k used, 486932k free, 181168k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 6519 nobody 20 0 384m 74m 880 S 1.0 15.3 18:22.97 memcached 3 root 20 0 0 0 0 S 0.3 0.0 0:38.03 ksoftirqd/0 1 root 20 0 24332 1552 776 S 0.0 0.3 0:00.56 init 2 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kthreadd 4 root 20 0 0 0 0 S 0.0 0.0 0:00.00 kworker/0:0 5 root 20 0 0 0 0 S 0.0 0.0 0:00.02 kworker/u:0 6 root RT 0 0 0 0 S 0.0 0.0 0:00.00 migration/0 7 root RT 0 0 0 0 S 0.0 0.0 0:00.62 watchdog/0 8 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 cpuset 9 root 0 -20 0 0 0 S 0.0 0.0 0:00.00 khelper ...output truncated...

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  • mysql settings - using the available resources

    - by Christian Payne
    I've got a lot of processing work I need to run on a mysql server. I've installed mysql 5.1.45-community on a Win 2007 64bit. Its running on a xenon, 3ghz 6 processors with 8 gig ram. It doesn't seem to matter what queries I run (or the number I run at the same time), when I look in task manager, I'll see one processor is out at 100%. The other 5 are idol. Memory is static at 1.54 gig. When I installed mysql, I used the wizard and selected the default "server" (not workstation) option. I feel like I should be getting more bang for my buck. Is there something else I should be monitoring or something I should change to use the other system resources???

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  • Windows Server 2003 R2 Standard: Locks MS Office files, but not Adobe .AI and .PSD files?

    - by Bruce Garlock
    We have some shares setup on a Windows 2003 R2 server, and the MS Office files people save behave properly: The first person to open the file gets read/write, and the second person to open the file while the first person still has the file open, gets a read-only version. This is not true for the graphics files, like Adobe Illustrator .AI files, and Photoshop .PSD files. Anyone who goes to open these files has full read/write, even if someone else is already working on the file! This has lead to numerous file corruption issues, as well as other lost work, since it always saves the last changes to the file. How do we get Windows to properly lock these files so when someone is working on a file, and someone else wants to open one, they get read-only access? Many thanks, Bruce

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  • SSH keys fail for one user

    - by Eli
    I just set up a new Debian server. I disabled root SSH and password auth, so you've gotta use a key file. For my primary user, everything works exactly as expected. I used ssh-keygen -t dsa and got myself a public and private key. Put one in authorized keys, put the other in a pem file locally. I wanted to create a user that I can deploy things with, so I did basically the same process. I addusered it, made a .ssh folder, ran ssh-keygen -t dsa (I also tried RSA), put the keys in their appropriate locations. No luck. I'm getting a Permission denied (publickey) error. When I use the exact same keys as the account that works, same error. When I enable password authentication, I can log in via SSH with the password. How do I debug this?

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  • Apache2, Tomcat6, and proxy redirects

    - by Randal Hale
    So here is my question - go easy and slow. I'm a GIS Consultant and general hack with linux. I inherited this volunteer job essentially because I knew more than the rest of the team - or the rest of the team isn't as stubborn as I am... With that said a number of people have been mucking around in the server before I got involved so I've been cleaning up a lot of things. The domain names have been changed to protect the innocent. I have a server running Apache2 (port 80) and tomcat6 (8080) running on ubuntu server 10.4. There is a virtual host on Apache2 called "Runner" (the domain is runner.org). I have mod_proxy loaded. I am trying to redirect everyone that visits runner.org to http://some.ip.address:8080/openrunner-webapp/ So far I've gotten runner.org assigned to the apache2 server. Someone set up a redirect in the httpd.conf file but I believe it needs to go into the virtualhost. I tried setting the redirect in the virtualhost as: *ProxyPass / http://localhost:8080/openrunner-webapp All that does is show me the root of the Apache webserver. Anyway I'm stuck

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  • supervise apache with daemontools

    - by perlwle
    I am trying to setup daemontools for two apaches in one server. one apache 2.2 listening on port 80 proxy request to a second apache 1.3 listening on port 8888. ./run script as following: #!/bin/sh # apache 1.3 exec /apache_1_3/apache/bin/httpd -F #!/bin/sh # apache 2.2 exec /apache_2_2/apache/bin/httpd -D FOREGROUND daemontools monitors both apache fine. however, If I stop apache2.2 (using svc -t or apachectl), the apache 1.3 will see the following error in error_log [crit] (98)Address already in use: make_sock: could not bind to port 8888 I had to manually apachectl stop the apache1.3 to stop the error message clobber the log file. There is no such problem before using daemontools. any idea why this is happening?

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  • virturalmin webmin dose not respond

    - by Miranda
    I have installed Virtualmin on a CentOS remote server, but it dose not seem to work https://115.146.95.118:10000/ at least the Webmin page dose not work. I have opened those ports http ALLOW 80:80 from 0.0.0.0/0 ALLOW 443:443 from 0.0.0.0/0 ssh ALLOW 22:22 from 0.0.0.0/0 virtualmin ALLOW 20000:20000 from 0.0.0.0/0 ALLOW 10000:10009 from 0.0.0.0/0 And restarting Webmin dose not solve it: /etc/rc.d/init.d/webmin restart Stopping Webmin server in /usr/libexec/webmin Starting Webmin server in /usr/libexec/webmin And I have tried to use Amazon EC2 this time, still couldn't get it to work. http://ec2-67-202-21-21.compute-1.amazonaws.com:10000/ [ec2-user@ip-10-118-239-13 ~]$ netstat -an | grep :10000 tcp 0 0 0.0.0.0:10000 0.0.0.0:* LISTEN udp 0 0 0.0.0.0:10000 0.0.0.0:* [ec2-user@ip-10-118-239-13 ~]$ sudo iptables -L -n Chain INPUT (policy ACCEPT) target prot opt source destination ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:20 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:21 ACCEPT udp -- 0.0.0.0/0 0.0.0.0/0 udp dpt:53 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:20000 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:10000 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:443 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:993 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:143 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:995 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:110 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:20 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:21 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:53 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:587 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:25 ACCEPT tcp -- 0.0.0.0/0 0.0.0.0/0 tcp dpt:22 Chain FORWARD (policy ACCEPT) target prot opt source destination Chain OUTPUT (policy ACCEPT) target prot opt source destination Since I need more than 10 reputation to post image, you can find the screenshots of the security group setting at the Webmin Support Forum. I have tried: sudo iptables -A INPUT -p tcp -m tcp --dport 10000 -j ACCEPT It did not change anything. [ec2-user@ip-10-118-239-13 ~]$ sudo yum install openssl perl-Net-SSLeay perl-Crypt-SSLeay Loaded plugins: fastestmirror, priorities, security, update-motd Loading mirror speeds from cached hostfile * amzn-main: packages.us-east-1.amazonaws.com * amzn-updates: packages.us-east-1.amazonaws.com amzn-main | 2.1 kB 00:00 amzn-updates | 2.3 kB 00:00 Setting up Install Process Package openssl-1.0.0j-1.43.amzn1.i686 already installed and latest version Package perl-Net-SSLeay-1.35-9.4.amzn1.i686 already installed and latest version Package perl-Crypt-SSLeay-0.57-16.4.amzn1.i686 already installed and latest version Nothing to do [ec2-user@ip-10-118-239-13 ~]$ nano /etc/webmin/miniserv.conf GNU nano 2.0.9 File: /etc/webmin/miniserv.conf port=10000 root=/usr/libexec/webmin mimetypes=/usr/libexec/webmin/mime.types addtype_cgi=internal/cgi realm=Webmin Server logfile=/var/webmin/miniserv.log errorlog=/var/webmin/miniserv.error pidfile=/var/webmin/miniserv.pid logtime=168 ppath= ssl=1 env_WEBMIN_CONFIG=/etc/webmin env_WEBMIN_VAR=/var/webmin atboot=1 logout=/etc/webmin/logout-flag listen=10000 denyfile=\.pl$ log=1 blockhost_failures=5 blockhost_time=60 syslog=1 session=1 server=MiniServ/1.585 userfile=/etc/webmin/miniserv.users keyfile=/etc/webmin/miniserv.pem passwd_file=/etc/shadow passwd_uindex=0 passwd_pindex=1 passwd_cindex=2 passwd_mindex=4 passwd_mode=0 preroot=virtual-server-theme passdelay=1 sessiononly=/virtual-server/remote.cgi preload= mobile_preroot=virtual-server-mobile mobile_prefixes=m. mobile. anonymous=/virtualmin-mailman/unauthenticated=anonymous ssl_cipher_list=ECDHE-RSA-AES256-SHA384:AES256-SHA256:AES256-SHA256:RC4:HIGH:MEDIUM:+TLSv1:!MD5:!SSLv2:+SSLv3:!ADH:!aNULL:!eNULL:!NULL:!DH:!ADH:!EDH:!AESGCM

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  • OSX Server 10.5 - Cannot log into Workgroup Manager - diradmin password is correct

    - by Mister IT Guru
    I've got a setup where I am trying to rescue a broken AD. We can no longer authenticate on the Workgroup manager, with passwords being rejected all the time - even though it is correct. I can connect using the workgroup manager on another server and I get the user list as expected, but when I click the padlock to make changes, I get the following screen: The problem is, I know the password is correct, I just used it to connect to the server in the first place. I can log into the server using the local admin, and services such as AFP, VPN and SMB continue to serve users. I have about 300 or so users on this server, and I would very much like to avoid having a rebuild. As there is much configuration that has been done without my knowledge (it's a client machine), I'd like to attempt to fix it, and then create another server and migration OD off this broken machine, then decommission it "gently". Ultimately this would mean no disruption of services. What I'd like it some tips as to how to fix the problem with authenticating to make changes in the work group manager, and maintenance on open directory in general. Thanks

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  • is there anyway to know if your supposedly fully dedicated server is really a virtually resource-sha

    - by siran
    Hi, sometimes I feel my server not responding as smoothly as I would expect (i have a Intel(R) Xeon(TM) CPU 2.80GHz Quad Core), given that for example, the 'top' commands reports a low load < 0.5, CPU are almost completely idle ... I maybe have internet connectivity issues, so I don't really know if it's me or if it's the server itself. Is there anykind of benchmarking script (or something analogous) I could run and see the actual performance of the server ?

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  • ClamD server Currently Down

    - by RedLEON
    I'm getting this error message after install ClamAV from direcadmin message system. OS: CentOs 5. The service 'clamd' on server star.tunahost.net is currently down This message has been automatically generated notifying you that the service clamd is currently down. Why can I get this error for each hour? I checked up cron jobs and I couldn't find any job about it. How to control Clamd service? OS: CentOS with DirectAdmin

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  • Should my web server add trailing slashes to URLs or remove them?

    - by jnm2
    I've read in several places that you should decide whether you want trailing slashes or no trailing slashes in your site URLs and stick to your choice consistently. This makes sense, but which should I pick? Is there a convention I ought to follow, performance to be gained, or is it totally up to my taste? (I notice that the StackExchange sites link without trailing slashes, but SE doesn't redirect if you add a slash.)

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  • How to increase video memory in libvirt/KVM gui?

    - by Dejan
    In the 'Virtual Hardware details', it lists the model as 'cirrus' with 9MB of RAM. The RAM field cannot be changed, but how to increate the video RAM? My host OS is RH6 and gust OS is Fedora16. EDIT: From guest OS, when I run xvinfo it displays 'no adaptors present'. I was trying to play a video using gstreamers xvimagesink plugin (XFree86 video output plugin using Xv extension). The problem is that xvimagesink is using hardware acceleration for video performance and hence the error Could not initialize Xv output. I guess I'll have to configure hardware acceleration for the guest.

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  • amavisd + postfix + dovecot blocks gif images

    - by David W
    I occasionally have a client who tries to email me and says his email gets blocked by my server. When I check the logs, I see this: Sep 6 18:12:52 myers amavis[15197]: (15197-08) p.path BANNED:1 [email protected]: "P=p003,L=1,M=multipart/mixed | P=p002,L=1/2,M=application/ms-tnef,T=tnef,N=winmail.dat | P=p004,L=1/2/1,T=image,T=gif,N=image001.gif,N=image001.gif", matching_key="(?-xism:^\\.(exe|lha|tnef|cab|dll)$)" And then a little later... Sep 6 18:12:58 myers amavis[15197]: (15197-08) Blocked BANNED (.image,.gif,image001.gif,image001.gif), [213.199.154.205] [157.56.236.229] <[email protected]> - > <[email protected]>, quarantine: banned-g4QhZGvwJvDF, Message-ID <6A9596BE385EC1499F83E464FA9ECCA20C668320@BY2PRD0611MB417.namprd06.prod.outlook.com>, mail_id: g4QhZGvwJvDF, Hits: -, size: 20916, 8439 ms From this and the bounce that he forwards me (to a different address I give him), I determine that its bouncing because of the file in his signature (image001.gif). However, that does NOT match the "key" in this part of the log: matching_key="(?-xism:^\\.(exe|lha|tnef|cab|dll)$)" Furthermore, the .gif extension is nowhere to be found in the /etc/amavisd.conf file (i.e. I'm not blocking emails because they contain .gif images). Am I missing something here? This is strange... and annoying.

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  • Certain clients (IP range) can not ping server

    - by Logman
    I just virtualized a Windows 2003 Server SP2 x32. The server contained our help desk server (Spiceworks) and our anti virus management server (ESET RAC). The host computer actually contained the virtualized server originally; I created the vhd and then I wiped this system clean and installed Windows 2008 R2 x64 Datacenter and added the virtualized 2003 onto the Hyper-V 2008 R2 Server. I got the server running fine except for... certain ip ranges. Local clients can get updates from the AV server from my 192.168.180.xxx & 192.168.181.xxx BUT NOT from any 192.168.182.xxx, 192.168.183.xxx, 192.168.184.xxx etc... I can not ping the server from any clients except for the 180. & 181. ranges. Now I created 2 other virtualized servers (win2008 & a win7 pro) and they exist on the same virtual host as the 2003 server. And at first I could not ping those until I went to the "\Network and Sharing Center\Advanced sharing settings" and Turned On File and Print Sharing. Then I could ping and access those virtualized guests. Win2003 server isn't quite the same. But I am sure I have it on. But now when I ping from a client on one of those ranges that would not work I get this: As you can see the ping leaves our network. We have 2 ad/dns servers (one 180. & the other in the 181. range). Is it DNS? Both AD/DNS servers are Windows 2003. And we plan on upgrading both to 2008 R2 within a month or two but I need to fix this issue pronto (esp the AV end). btw, I did rename that 2003 Server (Spiceworks/AV) hostname. And I tried a CNAME. But I do not think that is the problem. EDIT: OR because this server existed on this hardware/computer before becoming virtualized?

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  • Java Deployment Ruleset not working

    - by adbertram
    I've created a Java Deployment Ruleset that looks like this: <ruleset version="1.0+"> <rule> <id location="http://hpfweb.mydomain.com/" /> <action permission="run" version="1.6.0_20" /> </rule> <rule> <id location="http://*.mydomain.com" /> <action permission="run" /> </rule> <rule> </ruleset> I've created a self-signed cert, added it into the keystore as well as Trusted Certification Authorities. I have an app at http://hpfweb.mydomain.com that requires Java v1.6.20 and will error out if any other version is attempted. When only this version is installed on the computer the application works. However, if a newer version is installed, it does not. As you can see, I've attempted to force the version to 1.6.0_20 in the ruleset. I've confirmed the deployment rule set is being applied successfully by going into the Java Control Panel -- Security and "view the active deployment rule set". It is exactly as you see here. I've also looked at the web source for the application and all references point to http://hpfweb* links. When the applet is launched I've brought up task manager and have confirmed the java.exe launched is coming from the jre6 directory. When the newer version is installed, I'm getting the error "accesscontrolexception - access denied (java.awt.AWTPermission.accessEventQueue".

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  • Why does httpd handle requests for wrong hostnames in SSL mode?

    - by Manuel
    I have an SSL-enabled virtual host for my sites at example.com:10443 Listen 10443 <VirtualHost _default_:10443> ServerName example.com:10443 ServerAdmin [email protected] ErrorLog "/var/log/httpd/error_log" TransferLog "/var/log/httpd/access_log" SSLEngine on SSLProtocol all -SSLv2 SSLCipherSuite HIGH:MEDIUM:!aNULL:!MD5 SSLCertificateFile "/etc/ssl/private/example.com.crt" SSLCertificateKeyFile "/etc/ssl/private/example.com.key" SSLCertificateChainFile "/etc/ssl/private/sub.class1.server.ca.pem" SSLCACertificateFile "/etc/ssl/private/StartCom.pem" </VirtualHost> Browsing to https://example.com:10443/ works as expected. However, also browsing to https://subdomain.example.com:10443/ (with DNS set) shows me the same pages (after SSL certificate warning). I would have expected the directive ServerName example.com:10443 to reject all connection attempts to other server names. How can I tell the virtual host not to serve requests for URLs other than the top-level one?

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  • Wordpress Directory Permission to allow uploads, plugin folders, etc

    - by user1015958
    I have a wordpress pre-made site which were developed on my localmachine, and i uploaded it too a vps running on debian6, using nginx, mysql, php. Following this guide: 1) Create an unprivilaged user, this could be say 'karl' or whatever, and make them belong to the www-data group. So that if I were to login as karl and create a web root in say /home/karl/www/ , all the files will be owned by karl:www-data 2) Set up nginx as the user www-data in nginx.conf 3) Set up PHP-FPM to run as www-data 4) Place your files in /home/karl/www/[domain name maybe]/public_html/, upload as 'karl' so you don't have to chown everything again. when i type ls -l inside public_html/ it shows that all the files inside are owned by karl:karl. But the public_html directory is owned by karl:www-data. I chmod 0755 the folder wp-content but i still get the error: ERROR: Path ../wp-content/connection_images does not seem to be writeable. I know i shouldn't set it too 777 due to security reason, how should i set it too proper permission? and what should i set also to allow my users to upload,write posts,edit articles? Sorry for my english by the way.

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  • Create a new Plesk CLI user

    - by mattdwen
    I am trying to create a user which has rights to the Panels (v11) CLI tools. I've added the user to the psaadm group, as the documentation indicates, as well as the swkey-data group, as I was getting access denied for that dir. I am using sudo to run the command as that user: sudo -u mcp /usr/local/psa/bin/subscription --info test.com But I am receiving this error: Unable to connect to database: get_admin_password() failed: file_get_contents() failed: Suggestions?

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  • Iptables - Redirect outbound traffic on a port to inbound traffic on 127.0.0.1

    - by GoldenNewby
    I will be awarding a +100 bounty to the correct answer once it is available in 48 hours Is there a way to redirect traffic set to go out of the server to another IP, back to the server on localhost (preferably as if it was coming from the original destination)? I'd basically like to be able to set up my own software that listens on say, port 80, and receives traffic that was sent to say, 1.2.3.4. So as an example with some code. Here would be the server: my $server = IO::Socket::INET->new( LocalAddr => '127.0.0.1', LocalPort => '80', Listen => 128, ); And that would receive traffic from the following client: my $client = IO::Socket::INET->new( PeerAddr => 'google.com', PeerPort => '80', ) So rather than having the client be connecting to google.com, it would be connecting to the server I have listening on localhost for that same server. My intention is to use this to catch malware connecting to remote hosts. I don't specifically need the traffic to be redirected to 127.0.0.1, but it needs to be redirected to an IP the same machine can listen to. Edit: I've tried the following, and it doesn't work-- echo 1 > /proc/sys/net/ipv4/ip_forward iptables -t nat -A PREROUTING -p tcp --dport 80 -j DNAT --to-destination 127.0.0.1:80 iptables -t nat -A POSTROUTING -j MASQUERADE

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  • PHP scripts randomly becoming really slow to respond - Database lockup?

    - by webnoob
    Hi All, I wasn't sure whether to post this here or on stackoverflow, so apologies if its in the wrong place. I have about 7 php scripts running on a centOS VPS. Each of these scripts contacts a game server and processes the logs, with the logs it either does some database queries or sends info back to the game server. I am having an issue where some of the scripts will randomly become REALLY slow to respond and I don't know where to start with my debugging. Each script connects to its own database schema but on the same MySQL server. Each script will do about 4 inserts per second and twice as many select statements on their respective databases. I thought a database lockup may cause the issue but some console messages that are read from the database are sent to the game servers console without issue every 30 seconds, even when the script is slow to responding to other commands. Non of the scripts are using a lot of memory or CPU power. About 0.1% each. I know this information is really vague but I don't know linux very well at all (in fact, top is about my limit) and I really don't know where to start debugging this. Thanks.

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  • Raid-5 Performance per spindle scaling

    - by Bill N.
    So I am stuck in a corner, I have a storage project that is limited to 24 spindles, and requires heavy random Write (the corresponding read side is purely sequential). Needs every bit of space on my Drives, ~13TB total in a n-1 raid-5, and has to go fast, over 2GB/s sort of fast. The obvious answer is to use a Stripe/Concat (Raid-0/1), or better yet a raid-10 in place of the raid-5, but that is disallowed for reasons beyond my control. So I am here asking for help in getting a sub optimal configuration to be as good as it can be. The array built on direct attached SAS-2 10K rpm drives, backed by a ARECA 18xx series controller with 4GB of cache. 64k array stripes and an 4K stripe aligned XFS File system, with 24 Allocation groups (to avoid some of the penalty for being raid 5). The heart of my question is this: In the same setup with 6 spindles/AG's I see a near disk limited performance on the write, ~100MB/s per spindle, at 12 spindles I see that drop to ~80MB/s and at 24 ~60MB/s. I would expect that with a distributed parity and matched AG's, the performance should scale with the # of spindles, or be worse at small spindle counts, but this array is doing the opposite. What am I missing ? Should Raid-5 performance scale with # of spindles ? Many thanks for your answers and any ideas, input, or guidance. --Bill Edit: Improving RAID performance The other relevant thread I was able to find, discusses some of the same issues in the answers, though it still leaves me with out an answer on the performance scaling.

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  • How can I download Maven artifacts in chef?

    - by recampbell
    I want to do something like this in a chef recipe: maven_artifact "/opt/foo/my.jar" do source "com.foo:my:0.1:jar" end But I can't find a cookbook which provides this. I've written something which basically does this but it doesn't handle snapshots, which requires parsing maven-metadata.xml. Before I plunge into this, I wanted to be sure I wasn't missing something obvious since this seems like a basic usecase.

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  • Large File Uploads? SWFUpload?

    - by Ethabelle
    So, we offer video services and have run into an issue with people uploaded large file sources. I realized that our developer was utilizing php HTTP uploads to handle this and that was causing the slow times & breakdowns. Now, they keep coming at me wanting to use SWFUpload, quoting it is utilized by YouTube, but I'm adamantly against it because -- well, flash. However, I don't really know of a -better- solution that works across all browsers. So I was wondering SWFUpload, which hasn't been updated in a year, is really the viable solution?

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