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• Manually accessing GMail via IMAP

  - by Jeff Mc

  I'm trying to connect to gmail imap, but I am unable to execute any commands after login. I'm running openssl s_client -connect imap.gmail.com:993 to connect then, * OK Gimap ready for requests from 128.146.221.118 42if6514983iwn.40 . CAPABILITY * CAPABILITY IMAP4rev1 UNSELECT IDLE NAMESPACE QUOTA XLIST CHILDREN XYZZY SASL-IR AUTH=XOAUTH . OK Thats all she wrote! 42if6514983iwn.40 . LOGIN {email removed} {password removed} * CAPABILITY IMAP4rev1 UNSELECT LITERAL+ IDLE NAMESPACE QUOTA ID XLIST CHILDREN X-GM-EXT-1 UIDPLUS COMPRESS=DEFLATE . OK {email removed} authenticated (Success) . CAPABILITY at which point it simply hangs with the connection open. I'm guessing gmail pushes you off to a node in a cluster after it authenticate me?

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• Weird Windows 2003 MSDTC and SQL 2005 issue

  - by seagull surfer

  scenario: Windows 2003 sp2 x64 enterprise edition. SQL 2005 sp2 cu9 x64 Enterprise edition After restarting the resource groups on two node active-active cluster, 3 SQL 2005 instances start up fine. The 4th one starts up but starts throwing the following error. "Enlist operation failed: 0x8004d00e(XACT E NOTRANSACTION). SQL Server could not register with Microsoft Distributed Transaction Coordinator (MS DTC) as a resource manager for this transaction. The transaction may have been stopped by the client or the resource manager." MSDTC is fine since the other 3 function normally. The only way to "fix" it is to take the 4th instance offline and bring it online again. Is there any way to fix this enlistment without restarting?

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• Why does ganglia think my host is down?

  - by NZKoz

  I have ganglia set up to monitor our staging server, it's working great but I'm confused by the definition of 'down' to ganglia. There's a single node, running gmetad, gmond and the web frontend, but some small percentage of the time the web frontend shows some confusing output. Despite the fact that it's a single server in the cluster, and that server is the one serving the web interface, the dashboard output insists that the host is down. Then below that it has a graph which shows 50% down, 50% up. You can see an example of this here: http://i.imgur.com/MCWaS.jpg There's obviously something confusing ganglia somewhere, but I'm not sure where to start looking. Unfortunately googling for any combination of 'ganglia' 'down' 'metric name' seems return nothing but other people's ganglia installations displaying the same nonsense. Any tips on where to start looking would be greatly appreciated

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• How to host a scalable social networking app

  - by christopher-mccann

  I am in the middle of developing a social networking application for a very select user niche which could scale to a few million users. Right now I have always hosted applications on RackSpace Cloud and I have no issues with them at all - always been a really good service and never had any downtime. My question is though does anyone think that cloud computing is not the way to host scalable web apps? Or can anyone with experience of this recommend a better solution. I have always shunned trying to run big servers from my own facilities as I think it seems silly to go to the expense of bringing in big alternative power supplies and all the other necessary precautions when other companies already do this. I looked at managed hosting services but this proved to be a bit too expensive for us at the start and the scalability of it wasnt good enough - it would take a day or two to get a new server provisioned. Therefore I ended up on a cloud platform. If anyone has any recommendations or advice it would be greatly appreciated.

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• Using the same VPC image on multiple workstations

  - by justSteve

  I haven't used an VMs before so brand new to the party. I'm running Win7 off an honest to goodness MSDN license so OS licensing is not an issue. I'd like to think that I could create a VPC image on a USB/eSATA hard drive and move that drive from one Win7-based workstation/laptop to another and I'd have the same services/desktop/computing environment at all of them. I'm a developer working against the IIS7/SQL08 stack with VS10 so i'm working with apps and services as deeply embedded with the OS as you can get. Should I expect to be able to pull this off? thx

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• Virtualization deployment for datacenter

  - by bogha

  Hi, my company is going to deploy an IT Infrastructure on a virtual platform, can you please help me with the following: 1- which one do you recommend, Cisco Unified computing system ( cisco + emc + vmware )or HP Blades( virtualization solution + HP Storage )? 2- i Need to install a DNS Server, Web server, cpanel for managing hosting packages and Microsoft layer of product for usingg in the corporate infrastructur ( active directory, Local DNS, Exchange server, DHCP, Global catalog ) what is the minimum requirments for these servers ( in terms of CPU and Memory ) . 3- what is the best way to implement a redundant solution in a virtual environment. thank you

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• Memory upgrade - is the site reliable?

  - by Yuval

  Hi, I have a late-2008 unibody macbook model with 2 GB of ram. I am looking to upgrade to 4 GB of ram. I looked about a month ago at Other World Computing's 4 GB upgrade kit and I remember it being around $80. I looked today, finally getting to buy it and it went up to almost $100. I found another site, memoryupgrade.pro that calls itself "Pro memory upgrade" and it looks legitimate - it sells the memory for around $80 in its own brand. The only thing is, I haven't been able to find any reviews about it, and I'm not sure if it actually is reliable. Does anybody have any experience with this site? Does anybody have any other suggestions for buying macbook memory? I have friends who bought from OWC and were happy, should I just spend the extra $30 (including shipping) and buy from them? Thanks!

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• Configure all hosts, then create a list of the config for all hosts?

  - by AME

  I deployed a huge number of hosts with Ansible - which did work very nice. Each host got its individual settings and configuration. Now I'd like to generate a config file for another system that uses these hosts. For it, I need for every host a part of the generated configuration (the one that configures the database). Here is an example of the situation with two hosts having different configuration and the other system that uses a part of the Ansible-generated configuration: host1 ansible configured dbA host2 ansible configured dbQ The other system: host1 = dbA host2 = dbQ The values are computed differently (dbQ instead of dbB for host2 for example) if it belongs in a different cluster and so on, making it unpractical to just read out host configuration from the host_vars. I believe I would need to iterate over the hosts and let Ansible figure out the computed values for the variables like it would when deploying, but I do not know how to put that result in one template. Please advise :)

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• Windows Server Task Scheduler: Running scheduled executable fail-safe?

  - by Mikael Koskinen

  I have an executable which I've scheduled to run once in every five minutes (using Window's built-in Task Scheduler). It's crucial that this executable is run because it updates few time critical files. But how can I react if the virtual server running the executable goes down? At no point there shouldn't be more than 15 minutes break between the runs. As I'm using Windows Server and its Task Scheduler, I wonder is it possible to create some kind of a cluster which automatically handles the situation? The problem is that the server in question is running on Windows Azure and I don't think I can create actual clusters using the virtual machines. If the problem can be solved using a 3rd party tool, that's OK too. To generalize the question a little bit: How to make sure that an executable is run once in every 5 minutes, even if there might be server failures?

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• 912 stream processor available in OpenCL

  - by tugrul büyükisik

  I am thinking of assembling this system: AMD CPU (A8-3870 APU which has Radeon HD 6550D inside: 400 stream processors:xxx GFLOPS) nearly 110$ AMD Graphics card: HD 7750 (512 stream processors:819 GFLOPS peak performance) nearly 170$ Appropriate ram (1600MHz bus) Mainboard What GFLOPS level can I reach as a stable mode with using OpenCL and similar programs? Can I use all 912 stream processors at the same time? I am not trying to do a VS question. I need to know what could be better for scientific computing (%75 of the time) and gaming (%25 of the time) because I have a low budget. With "scientific calculations" I mean fluid dynamics/solid state physics simulating; with games I mean those that need openCL and PhysX.

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• MySQL proxy HA with no need to reconnect after node failure

  - by Matthias

  I use MySQL with Galera wsrep to get synchronous replication, that part it's up and running I need to setup a kind of proxy to handle client connections. Since any node in cluster can fail, clients will not connect nodes directly, but only via proxy. Currently I use Galera Load Balancer which does it work, but with one exception: if one node fails, all clients connected via proxy to that node get connection error and need to reconnect. I have no control over server applications connected to proxy and some of them can't reconnect automatically and need manual restart. So the question is how to force proxy automatically redirect already connected applications to new data node, without need to reconnect?

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• Multiple servers acting like a single one with all the hardware?

  - by marc.riera

  Hello, by now I have 10 servers for hpc, power computing oriented. My users need to launch several processes using qmake. The users are used to work with ubuntu 9.10, and the software from the repositories is switable for them. I've deployed ubuntu 9.10 to all 10 servers (pxe rocks). By now we work with parallel-ssh and cluster-ssh, which allows as to launch the same process to all servers. With this tools this tools the servers remain as independent but with the same software and the same launched command. Now we would like to go to next step and see all the servers as a single one with all the resources from the other 9 as if was its resources. The difference would be substantial in time to process and also time to design the command to launch. Any advice on wich software to use will be very useful? Thanks

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• Azure Linux Virtual Machines Price per Hour, Computation or Running?

  - by Arjun Bajaj

  first of all, I couldn't find a StackExchange site on Cloud Computing. I think this is the most appropriate site, because some of you might be using Azure. So I just wanted to know: The Windows Azure Pricing Page shows Linux Virtual Machine Price as $0.013/hr for an extra small VM. The monthly price comes up to about $10. Is this price charged as number of hours of computation done on the VM or number of hours of running the VM? And if I shutdown the VM, will I be charged anything?

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• master-slave-slave replication: master will become bottleneck for writes

  - by JMW

  hi, the mysql database has arround 2TB of data. i have a master-slave-slave replication running. the application that uses the database does read (SELECT) queries just on one of the 2 slaves and write (DELETE/INSERT/UPDATE) queries on the master. the application does way more reads, than writes. if we have a problem with the read (SELECT) queries, we can just add another slave database and tell the application, that there is another salve. so it scales well... Currently, the master is running arround 40% disk io due to the writes. So i'm thinking about how to scale the the database in the future. Because one day the master will be overloaded. What could be a solution there? maybe mysql cluster? if so, are there any pitfalls or limitations in switching the database to ndb? thanks a lot in advance... :)

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• Complete solution to upgrade PostgreSQL on debian production server

  - by Daimon

  I'm using Debian 6 (Squeeze) in production for a couple of websites. I decided to use postgresql backports so that I could use PostgreSQL 9.0 features. I thought that it would remain 9.0 and receive updates to that major version. Unfortunetly Squueze backports were updated to PostgreSQL 9.1 so probably I won't receive updates to 9.0. I'm planning upgrading to 9.1 but I know that it's not done automatically. I've read about official pg_upgrade and debian's pg_upgradecluster, but I would appreciate complete guide to upgrade. What are steps to do (first apt-get install postgresql, then pg_upgradecluster, then remove old cluster)? List of steps would be nice. What are possible failure scenarios? How to prepare to failures and react on them? I can stop database for a couple of hours only so I want to be prepared

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• How to Delete File stderr1 on a SAP System?

  - by Techboy

  I have a file called stderr1 in the work directory of several of the SAP servers in my production cluster. It has grown to around 19GB's to fill the hard disk on each server. I have deleted all trace files and WP files from within transaction SM50 but that hasn't deleted it (or re-named it to .old). If I try to rename or delete it manually, it says I can't because the file is in use. Please can you tell me how I can delete or shrink the stderr1 file?

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• Mounting Gluster Volumes

  - by Roman Newaza

  I have created Hosted Zone with 2 IP addresses of Gluster Cluster, both IP are returned by dig. After mounting Gluster, I cannot ls mount point as it takes long time. mount shows me it's mounted, but df doesn't. Finally, I have this: ls: cannot access /mnt/storage: Transport endpoint is not connected. But if I mount it with the one of the IP, no problem - volume contents is accessible OS: Ubuntu 11.10 GlusterFS: 3.2.6 Log: http://pastie.org/private/2jgp4h1hnqgzych3djtg I have can telnet storage from client - ports are open.

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• LinkSys WRT54GL + AM200 in half-bridge mode - Setup guide recommendations?

  - by Peter Mounce

  I am basically looking for a good guide on how to set up my home network with this set of hardware. I need: Dynamic DNS Firewall + port-forwarding VPN Wake-on-LAN from outside firewall VOIP would be nice QoS would be nice (make torrents take lower priority to other services when those other services are happening) DHCP Wireless + WPA2 security Ability to play multiplayer computer games I am not a networking or computing neophyte, but the last time I messed with network gear was a few years ago, so am needing to dust off knowledge I kinda half have. I have read that I should be wanting to set up the AM200 in half-bridge mode, so that the WRT54GL gets the WAN IP - this sounds like a good idea, but I'd still like to be advised. I have read that the dd-wrt firmware will meet my needs (though I gather I'll need the vpn-specific build, which appears to preclude supporting VOIP), but I'm not wedded to using it. My ISP supplies me with: a block of 8 static IPs, of which 5 are usable to me a PPPoA ADSL2+ connection

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• How to correctly set up iWARP? Preferably on loopback

  - by ajdecon

  iWARP is a protocol for doing remote direct memory access (RDMA) on top of TCP/IP, so that it can work with Ethernet and other network types as opposed to Infiniband. It works with many of the standard IB interfaces - the IB verbs, for example - so it's all pretty transparent. I'm doing some IB-verbs programming (mostly for the sake of learning about how they work better), and it'd be wonderfully convenient for me if I could use iWARP to do RDMA over my loopback interface, so that I could test some of my code without getting on our IB-connected cluster. :-) But I cannot figure out how to get a "local development environment" set up: there are no tutorials I'm aware of for even setting up iWARP from scratch on a server or a network interface. Can anyone give me a tutorial or point me in the right direction? Environment is Fedora 16 running in VirtualBox.

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• Sun Grid Engine (SGE) Jobs Not Visible After Adding virtual_free

  - by Gary Richardson

  I'm trying to to use virtual_free to limit the number of large memory jobs running each grid node in my cluster. This seems to be working as expected. After I modified my code to submit jobs with the memory instances, qstat -f -q $queueName no longer shows a list of jobs waiting for a slot. The jobs are submitted with a specific queue (-q $queueName). I'm guessing this is happening due to the magic of SGE queue selection. Is there a way to make my jobs show up as before? Thanks! UPDATE I'm using: qstat -f -u * -q $queueName to view the queue. If I drop the queue argument, I can see the jobs. If I examine a specific job, I can see that it has the correct hard_queue_list value set. I'm also using Sun Grid Engine 6.1u4

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• SQL server 2000 reporting bad values to ASP.Net Application

  - by Ben

  I have an instance of SQL server 2000 (8.0.2039) with a rather simple table. We recently had users complain about an application I wrote returning bad values for some of the dates in the databse. When I query the table directly via Server Management Studio, it will return the correct values, however the identical queries from my application report the wrong values, but only for a couple of dates. I have been over the code, and it is solid. If the error was in the code, all of the dates reported should be wrong. I have also run the code on an identical test database, and everything is reported properly. I believe the problem may lie in the sql instance itself, which is why I am posting in Server Fault. My question is, has anyone heard of a database reporting bad (incorrect) date values when queried via web application? It should be noted that this particular server was once manually rebuilt after having a cluster clean run on it.

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• Staggering java linux process startup to prevent OOM

  - by ctennis

  I am running a number of java processes on a single Linux machine. From a memory and computing standpoint, everything is fine when things are static. However, periodically we use a configuration management package up upgrade the jar or war files, and restart the java process. The problem is, that is restarts them all relatively quickly, and so we get 10 or so java VMs restarting all at the same time (we use daemontools for the service stops/starts), which wreaks havoc on the machine, in terms of OOMs or just really slow. This is because it's spawning the JVM 10x at the same time. Other than trying to stagger the startups, is there a smarter way of handling this? Maybe a sysctl tuning performance parameters, or a JVM parameter?

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• LinkSys WRT54GL + AM200 in half-bridge mode - UK setup guide recommendations?

  - by Peter Mounce

  I am basically looking for a good guide on how to set up my home network with this set of hardware. I need: Dynamic DNS Firewall + port-forwarding VPN Wake-on-LAN from outside firewall VOIP would be nice QoS would be nice (make torrents take lower priority to other services when those other services are happening) DHCP Wireless + WPA2 security Ability to play multiplayer computer games I am not a networking or computing neophyte, but the last time I messed with network gear was a few years ago, so am needing to dust off knowledge I kinda half have. I have read that I should be wanting to set up the AM200 in half-bridge mode, so that the WRT54GL gets the WAN IP - this sounds like a good idea, but I'd still like to be advised. I have read that the dd-wrt firmware will meet my needs (though I gather I'll need the vpn-specific build, which appears to preclude supporting VOIP), but I'm not wedded to using it. I live in the UK and my ISP supplies me with: a block of 8 static IPs, of which 5 are usable to me a PPPoA ADSL2+ connection

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• LinkSys WRT54GL + AM200 in half-bridge mode - UK setup guide recommendations?

  - by Peter Mounce

  Crossposted from here I am basically looking for a good guide on how to set up my home network with this set of hardware. I need: Dynamic DNS Firewall + port-forwarding VPN Wake-on-LAN from outside firewall VOIP would be nice QoS would be nice (make torrents take lower priority to other services when those other services are happening) DHCP Wireless + WPA2 security Ability to play multiplayer computer games I am not a networking or computing neophyte, but the last time I messed with network gear was a few years ago, so am needing to dust off knowledge I kinda half have. I have read that I should be wanting to set up the AM200 in half-bridge mode, so that the WRT54GL gets the WAN IP - this sounds like a good idea, but I'd still like to be advised. I have read that the dd-wrt firmware will meet my needs (though I gather I'll need the vpn-specific build, which appears to preclude supporting VOIP), but I'm not wedded to using it. I live in the UK and my ISP supplies me with: a block of 8 static IPs, of which 5 are usable to me a PPPoA ADSL2+ connection

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• SGE: downtime planning

  - by mousee

  I need to plan a downtime for a maintenance of my environment (or some part of my environment) by means of Sun Grid Engine. Is it possible to somehow use backfilling information to tell the grid engine to plan only those jobs on cluster which are able to finish (i have backfilling information) till let's say 10 am next day? Can I then at 10 am rely on the fact that all compute nodes are clean, jobs are only queued, no job is planned and so that I can start maintenance? Thank you for your time. mousee

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