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• How well will ntpd work when the latency is highly variable?

  - by JP Anderson

  I have an application where we are using some non-standard networking equipment (cannot be changed) that goes into a dormant state between traffic bursts. The network latency is very high for the first packet since it's essentially waking the system, waiting for it to reconnect, and then making the first round-trip. Subsequent messages (provided they are within the next minute or so) are much faster, but still highly-latent. A typical set of pings will look like 2500ms, 900ms, 880ms, 885ms, 900ms, 890ms, etc. Given that NTP uses several round trips before computing the offset, how well can I expect ntpd to work over this kind of link? Will the initially slow first round trip be ignored based on the much different (and faster) following messages to/from the ntp server? Thanks and Regards.

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• All of ESX4 hosts not responding after rebooting vCenter server

  - by hojyokinmo

  Hello I'm constructing 5ESX+a vCenter serv. I'm testing FT on the system. Today vCenter OS (W2008) demanded system reboot. After rebooting vCenter Serv. All of ESX hosts have alert icon. end indicate "not responding" I tried to connect ESX (version 4) hosts to vCenter again. Once they came back normally, but after few seconds ,They turned red again. All of them have ping connection to vCenter serv. There are no red messages in Tusks and events. Two messages are found in Summary of Cluster ·There aren't sufficient resource for HA failover. ·Can't contact primary HA agent. I'm also not able to reset FT configuration because all of VMS aren't accessed from vCenter What should I do?

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• High Memory Utilization on weblogic

  - by Anup

  My Weblogic App Server shows high Memory Utization. The application seems to perform good without any memeory issues. Now that my traffix is going to increase i am worried about the memory and have a feeling things could go bad and need to take action now and i am confused as to should i increase The JVM memory on the weblogic instances which means adding more physical memory or should i increase the number of managed instances in the cluster. Would like to understand what does having high memory utilization mean and the advantage and disadvantages of adding JVM memory and adding managed instances. Thanks

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• How much processor speed and cores do I need for these tasks?

  - by ajay

  I am planning to buy a new laptop as I find my current one very slow. My question here is specifically related to RAM size and CPU power. I will mostly be doing development (not much games). I would be dabbling in distributed computing, multithreaded and data intensive parallelizable tasks on multi-cores. For e.g. I would want to be able to Concurrent programming in Scala/Java/Clojure etc. and be able to see parallelization. Furthermore, I would want the RAM to be enough. But from a developer machine standpoint, do you think 4GB RAM and 2.53GHz Dual Core processor would be enough. I'm basically looking at this model: http://store.apple.com/us/configure/MC118LL/A?mco=MTM3NDcyODk (link dead)

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• Is the field BusID necessary in XF86Config?

  - by Greg

  Hello, I am using a cluster of machines running on Ubuntu 10.04 LTS which are supposed to be homogeneous, but apparently they are not. In particular, I am configuring the X server on these machines, and I pushed a /etc/X11/XF86Config that includes the following section: Section "Device" Identifier "Device0" Driver "nvidia" VendorName "NVIDIA Corporation" BusID "PCI:5:0:0" EndSection The problem is that the BusID of the graphic card is PCI:5:0:0 for some machines, and PCI:3:0:0 for others. Is there a way that the X server automatically detects the appropriate Device (based on the name for instance)? Thanks,

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• Private cloud solution [Eucalyptus,OpenStack, Nimbus] for Java deployments [Glassfish, Tomcat]

  - by Tadas D.

  I am interested in a way to have private cloud which would host Glassfish (or Tomcat) server. Which option from Eucalyptus, Openstack or Nimbus would be best to deploy java applications on it? Or maybe there is something other and I am looking wrong at the problem? The way I imagine this, that I should have some shared storage that I could expand by introducing new nodes to this cluster and have easy management for glassfish instances: something like virtual machines images that I can start and stop on demand and that image is shared among nodes. I don't need concrete step-by-step solution here but guidelines how this should be done are very welcome.

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• which NoSQL for billions of records [closed]

  - by airtruk

  There are plenty of discussions around NoSQL databases around and a lot of them are about data logging in the social media section. The problem I'm trying to solve falls more into the scientific computing section, where I have several 1000s of billions of pieces of information that I want to query with different a different criteria for each query. All data is at least a 4 dimensional space, which means I have a 3D location (x,y,z) and a time component - plus the value and unit. Say temperature at xyz and 10min in degree Celcius. A typical query result may contain several million results ... I have read about pretty much all NoSQL solutions being exceptionally fast for inserting records, but when it comes to querying them it's a different story. I'm leaning towards MongoDB for the implementation and platform for developing the necessary code since it is more closely related to the current solution using MySQL. Happy to be proven wrong though when it comes to the choice of the NoSQL solution.

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• does heartbeat v3 support same resource agent types of pacemaker?

  - by Emre He

  As we know, Pacemaker supports three types of Resource Agents, ? LSB Resource Agents, ? OCF Resource Agents, ? legacy Heartbeat Resource Agents http://www.linux-ha.org/wiki/Resource_Agents does heartbeat v3 support above 3 types resource agent? or it only support LSB and legacy heartbeat resource agents? because we have only virtual ip and one service need to switch in ha cluster, so we decide not involve pacemaker, so we come to this question, for example we cannot monitor the application service by heartbeat, heartbeat only can handle to start it on active node. thanks, Emre

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• BitchX - Segmentation fault

  - by alexus

  Last login: Tue Mar 16 15:29:57 on ttys002 mbp:~ alexus$ sudo port install bitchx Password: --- Computing dependencies for bitchx --- Fetching ncursesw --- Attempting to fetch ncurses-5.7.tar.gz from http://distfiles.macports.org/ncurses --- Verifying checksum(s) for ncursesw --- Extracting ncursesw --- Configuring ncursesw --- Building ncursesw --- Staging ncursesw into destroot --- Installing ncursesw @5.7_0+darwin_10 --- Activating ncursesw @5.7_0+darwin_10 --- Cleaning ncursesw --- Fetching ncurses --- Verifying checksum(s) for ncurses --- Extracting ncurses --- Configuring ncurses --- Building ncurses --- Staging ncurses into destroot --- Installing ncurses @5.7_0+darwin_10 --- Activating ncurses @5.7_0+darwin_10 --- Cleaning ncurses --- Fetching bitchx --- Attempting to fetch ircii-pana-1.1-final.tar.gz from http://voxel.dl.sourceforge.net/bitchx --- Verifying checksum(s) for bitchx --- Extracting bitchx --- Applying patches to bitchx --- Configuring bitchx --- Building bitchx --- Staging bitchx into destroot --- Installing bitchx @1.1_1+darwin --- Activating bitchx @1.1_1+darwin --- Cleaning bitchx mbp:~ alexus$ BitchX BitchX - Based on EPIC Software Labs epic ircII (1998). Version (BitchX-1.1-final) -- Date (20040326). Process [30864] Segmentation fault mbp:~ alexus$ any ideas why is it doing "Segmentation fault" and how to troubleshoot it?

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• httperrors for Linux

  - by Aaron McRuer

  I'm here because the Google has failed to get me what I need. I just recently graduated from university, and I'm working on a website. Back in college I used the school's web server for my projects, and there were a few tools that aided in the process. One was a Linux program/script/executable/prayer to the computing gods called "httperrors". You typed that into bash, and it would pop up any errors that would occur while running the web server. Specifically, if you had errors in your php code, it would tell you what was wrong. I guess it was a debugger of sorts. I can't find any such program's details online. Does this sound familiar to anyone?

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• How could I represent 1.625 by 0 or a 1 (binary digit)?

  - by pepito

  This is an excerpt from wikipedia about 'full rate' speech coding standard. Full Rate or FR or GSM-FR or GSM 06.10 was the first digital speech coding standard used in the GSM digital mobile phone system. The bit rate of the codec is 13 kbit/s, or 1.625 bits/audio sample. And this one is an excerpt from wikipedia about bit. In computing parlance, bit is the abbreviation for a single binary digit, represented by a 0 or a 1. How could I represent 1.625 by 0 or a 1? Actually, that's my lecturer's question that I could not answer. Some links to papers are more than welcome. Thanks in advance.

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• Google Search Appliance: Limiting Number of Results

  - by senfo

  I am attempting to limit the number of results that are displayed as a result of dynamic result clustering on the Google Search Appliance. I've looked through the XSLT, but I've only come across the following two user-modifiable options: <!-- *** dyanmic result cluster options *** --> <xsl:variable name="show_res_clusters">1</xsl:variable> <xsl:variable name="res_cluster_position">right</xsl:variable> Are there more options that I'm unaware of that I could use to limit the results? Is there another way that I'm missing?

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• GlusterFs - high load 90-107% CPU

  - by Sara

  I try and try and try to performance and fix problem with gluster, i try all. I served on gluster webpages, php files, images etc. I have problem after update from 3.3.0 to 3.3.1. I try 3.4 when i think maybe fix it but still the same problem. I temporarily have 1 brick, but before upgrade will be fine. Config: Volume Name: ... Type: Replicate Volume ID: ... Status: Started Number of Bricks: 0 x 2 = 1 Transport-type: tcp Bricks: Brick1: ...:/... Options Reconfigured: cluster.stripe-block-size: 128KB performance.cache-max-file-size: 100MB performance.flush-behind: on performance.io-thread-count: 16 performance.cache-size: 256MB auth.allow: ... performance.cache-refresh-timeout: 5 performance.write-behind-window-size: 1024MB I use fuse, hmm "Maybe the high load is due to the unavailable brick" i think about it, but i cant find information on how to safely change type of volume. Maybe u know how?

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• SQLServer 2008 FailOver and Load Balancing

  - by Jedi Master Spooky

  I have a project with a 2TB database ( 450.000.000 rows). I need to provide to the proyect a solution that gives FailOver and load Balacing, what do you recommend? We are going to use a NetApp Filer for the Data Files and for the File System of the Proyect. I read that SQl Clustering does not provide load balacing. If I cannnot have this feature and I have to go only to the FailOver what Server ( I presume that the key feature here is memory) would you recomend. We are adding 1.000.000 rows a day. Once the rows is inserted we are doing a lot of updates to that row for about 1 week then the row get static. Because of this I am thinking in some kind of history table or database or something like that. I am open to the Os servers implementation, I was thinking of a windows 2008 server with cluster but this depend of the database solution

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• So how does one use rockmongo to connect to a mongo sharded setup with replicasets?

  - by Tom

  I try to use rockmongo, to connect to our cluster. Our setup is a setup of two shards each consisting of a replicaset. I try to connect to the mongos instance and while rockmongo connects I get an error when trying to list the dbs: Execute failed:not master function (){ return db.getCollectionNames(); } This has something to do with the replica sets and everybody points to: $MONGO["servers"][$i] = array("replicaSet" => "xxxxx"); This is all fine, but I have two replicasets and as far as I understand I should connect to the mongos instance and not directly to the members of the set. So how does one use rockmongo to connect to a mongo sharded setup with replicasets?

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• DB2 users and groups

  - by Arun Srini

  Just want to know everyone's experience and take on managing users/authentication on a multi-node db2 cluster with users groups. I have 17 apps in production (project based company, only 2 online apps), and some 30 users with 7 groups. prodsel - group that has select privilege on all tables produpdt - update group on selective tables (as required by the apps) proddel - delete prodins - insert permissions for the group Now what my company does is when an app uses certain user (called app1user), and needs select and insert privilege on a table, they 1. grant select and insert for prodsel, prodins respectively 2. add the user under those two groups... now this creates one to many relationship between user and privileges, and this app1user also gets select on other tables granted for the prodsel group. I know this is wrong. Before I explain, I need to know how this is done elsewhere. Please share your experiences, even if you use other Databases that uses OS level authentication.

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• Changing memory allocator to Jemalloc Centos 6

  - by Brian Lovett

  After reading this blog post about the impact of memory allocators like jemalloc on highly threaded applications, I wanted to test things on a larger scale on some of our cluster of servers. We run sphinx, and apache using threads, and on 24 core machines. Installing jemalloc was simple enough. We are running Centos 6, so yum install jemalloc jemalloc-devel did the trick. My question is, how do we change everything on the system over to using jemalloc instead of the default malloc built into Centos. Research pointed me at this as a potential option: LD_PRELOAD=$LD_PRELOAD:/usr/lib64/libjemalloc.so.1 Would this be sufficient to get everything using jemalloc?

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• vCenter Server: This host currently has no management network redundancy

  - by goober

  Background I'm on a new VMWare install consisting of: 1 vCenter Server (containing inventory service, SSO, vCenter server, and web client server) 2 ESX Servers configured in a HA group Problem When a I view the summary for any one of my servers, I receive a notice: "" This is expected in our scenario and we're okay with it. Attempted Solutions As I understand from this article and this discussion, the proper way to remove the error message is to ignore it via setting the "das.ignoreRedundantNetWarning" propery to "true". I took the following steps: Logged into vCenter Right-clicked on my HA cluster and chose "Edit Settings..." Clicked "vSphere HA" section Clicked "Advanced Options..." Added the "das.ignoreRedundantNetWarning" option with a value of "true". Question How do I get this error to go away, and are there any reasons why adding this option may not have worked? References Network redundancy message when configuring VMware High Availability in vCenter Server [VMWare KnowledgeBase] How remove a notice " has no management network redundant" [VMWare Community]

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• NIS client cannot find NIS server (Opensuse)

  - by Tony

  I installed NIS server on head node of a virtual cluster(VirtualBox). One of the node (let's say node-1) can find NIS server and work with it, but another node (node-2) just can't find the NIS server in Yast while it can ping and ssh to both head node and node-1. BTW, all the nodes are VMs, head node and node-1 are on the same physical machine, node-2 is on another physical machine. I set the domain name in /etc/hosts and /etc/yp.conf, and ypwhich sometimes gives the correct domainname several minutes later complains about "ypwhich: Can't communicate with ypbind", and will back to work after some time. Also tried rpcinfo -p hostname and it worked as expected. I almost tried every thing I can find on internet, but seems that not many people had this problem. Any help would be very appreciated.

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• How to use iSCSI inside HyperV VM?

  - by William

  I have 2 Dell R710 servers (intended to set up HyperV cluster) and a MD3000i SAN set up: Server1/Server2: NIC 1: connected to company LAN NIC 2: crossover to the other server's NIC 2 NIC 3: crossover to iSCSI port of SAN controller 1 NIC 4: crossover to iSCSI port of SAN controller 2 I have both servers setup as diskless servers with iSCSI boot from SAN without problem. But how can I access iSCSI from within the VM such that I can set up clustering inbetween the VMs? I can ping from the host to the SAN but found that NIC3/4 cannot be used for virtual network in HyperV? What am I doing wrong?

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• autofs mac os x afp not loading as correct user?

  - by Stephen Furlani

  Hello, I am way out of my depth, and I am trying to get all of my nodes on a cluster to mount a drive on my head node. I've got /etc/auto_master and /etc/auto_afp configured according to Apple's "Autofs: Automatically Mounting Network File Shares in Mac OS X" White Paper: /etc/auto_master +auto_master # Use directory service /net -hosts -nobrowse,hidefromfinder,nosuid /home auto_home -nobrowse,hidefromfinder /Network/Servers -fstab /- -static /- auto_afp /etc/auto_afp /Volumes/userA -fstype=afp afp://userA:[email protected]:/ /Volumes/userB -fstype=afp afp://userB:[email protected]:/ I am logged into a compute-node as userA. automount appears to mount both /Volumes/userA and /Volumes/userB to head-node.local:/Users/userA/Documents/ even though I have usernames, passwords, and user-directory specified in the afp url. If I go and login with Finder - it mounts userB appropriately. File sharing and cd/dvd sharing is enabled on all computers involved. Am I doing the right thing, and if so, what did I do wrong? -Stephen

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• What kind of server do I need to handle 10 million requests and mySQL queries a day?

  - by Calvin

  I'm a new bie of server administration and I'm looking for a powerful hosting service to host my new website. This website is basically a back-end of an mobile online game, and it will: handle up to 10 million of HTTPS request and mySQL queries a day store up to 2000 GB file on the hard disk transfer probably 5000 GB data in and out per month it runs on PHP and mySQL have 10 million records in mySQL database, for each record there are 5-10 fields, around 100 bytes each I really don't know what kind of a server I need to handle these requirements, my question is: what cpu/ram do I need for a dedicated server or vps? what hosting companies are able to offer this kind of dedicated server or VPS? what about cloud computing? I've researched Amazon EC2 but it seems complicated to me. And I've contacted Rackspace but strangely they said Cloudsites is not suitable for my requirements. I wonder if there is other cloud hosting company. any other alternative method? thanks very much!

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• Ganglia and how it communicates

  - by MikeKulls

  I'm a little confused about how Ganglia sends information around and have found conflicting information on the web. I would have thought that the gmond process would either send info to gmetad at a regular interval or gmetad would request info from the various instances of gmond. At least one online article states this is how it works but from what I understand this is incorrect. It appears that you configure all gmond processes to send their info to a central gmond process and gmetad will request info from that central gmond. Is that correct? In my case I have 6 servers sending their information to 1 central server. If I set gmetad to get it's information from the central server then I get information from all 6 servers, all good.. Their weird thing is that if I point gmetad to one of the 6 servers then I still get info from all 6 servers. How is it that server 1 in my cluster if getting stats from all the other servers?

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• Run Linux command as predefined user

  - by vijay.shad

  Hi all, I have created a shell script to start a server program. startup.sh start When above command will executes, it will try starts the server as adminuser. To achieve this my script has written like this. SUBIT="su - adminuser -c " SERVER_BOX_COMMAND_A="Server" ############## # Function to start cluster function start(){ $SUBIT "$SERVER_BOX_COMMAND_A" } When i execute the command it asks for password. Is there any other way to do this so, it will not ask for password. I have seen this behavior in Jboss startup script provided on jboss. That script changes the user to jboss and then starts the jboss server. I wanted my script to behave same way.

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• How to Shrink/Reset 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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