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  • protecting an application against hardware failure [on hold]

    - by alex
    I have an application for which I am looking for a way to protect against hardware and software (operating system ) failure. Cluster seems OK but the storage become the single point of failure and also I do not have a SAN. Can you please tell me if there are other ways to protect the application? Periodically this application is updated and changes should be replicated automatically to the second server.

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  • Finding latest successful logins and failed attempts to a CentOS server

    - by ahmad
    I'm looking for a log file or any service to report the latest login attempts which have failed due to username/password miss match. Is there such utility available for CentOS? (built-in is preferred) My second question, and more generally, I need a log file of penetration attempts to my server. Ideally, this log should contain all attempts including logins, httpd activities, and other conventional open ports.

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  • Redirect domainA.com to sub.domainB.com

    - by Duroth
    Just a short and easy question, I hope. Currently, I've got a primary domain linked to my (virtual) hosting server. I now have a second domain name which I would like to link to a specific subdomain, i.e. domainB.com/X - subdom.domainA.com/X Preferably without having this redirect show up in the address bar. Can this be achieved through DNS settings alone, or would it require me to add a .htaccess file in Domain A's root folder?

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  • Troubleshooting latency spikes on ESXi NFS datastores

    - by exo_cw
    I'm experiencing fsync latencies of around five seconds on NFS datastores in ESXi, triggered by certain VMs. I suspect this might be caused by VMs using NCQ/TCQ, as this does not happen with virtual IDE drives. This can be reproduced using fsync-tester (by Ted Ts'o) and ioping. For example using a Grml live system with a 8GB disk: Linux 2.6.33-grml64: root@dynip211 /mnt/sda # ./fsync-tester fsync time: 5.0391 fsync time: 5.0438 fsync time: 5.0300 fsync time: 0.0231 fsync time: 0.0243 fsync time: 5.0382 fsync time: 5.0400 [... goes on like this ...] That is 5 seconds, not milliseconds. This is even creating IO-latencies on a different VM running on the same host and datastore: root@grml /mnt/sda/ioping-0.5 # ./ioping -i 0.3 -p 20 . 4096 bytes from . (reiserfs /dev/sda): request=1 time=7.2 ms 4096 bytes from . (reiserfs /dev/sda): request=2 time=0.9 ms 4096 bytes from . (reiserfs /dev/sda): request=3 time=0.9 ms 4096 bytes from . (reiserfs /dev/sda): request=4 time=0.9 ms 4096 bytes from . (reiserfs /dev/sda): request=5 time=4809.0 ms 4096 bytes from . (reiserfs /dev/sda): request=6 time=1.0 ms 4096 bytes from . (reiserfs /dev/sda): request=7 time=1.2 ms 4096 bytes from . (reiserfs /dev/sda): request=8 time=1.1 ms 4096 bytes from . (reiserfs /dev/sda): request=9 time=1.3 ms 4096 bytes from . (reiserfs /dev/sda): request=10 time=1.2 ms 4096 bytes from . (reiserfs /dev/sda): request=11 time=1.0 ms 4096 bytes from . (reiserfs /dev/sda): request=12 time=4950.0 ms When I move the first VM to local storage it looks perfectly normal: root@dynip211 /mnt/sda # ./fsync-tester fsync time: 0.0191 fsync time: 0.0201 fsync time: 0.0203 fsync time: 0.0206 fsync time: 0.0192 fsync time: 0.0231 fsync time: 0.0201 [... tried that for one hour: no spike ...] Things I've tried that made no difference: Tested several ESXi Builds: 381591, 348481, 260247 Tested on different hardware, different Intel and AMD boxes Tested with different NFS servers, all show the same behavior: OpenIndiana b147 (ZFS sync always or disabled: no difference) OpenIndiana b148 (ZFS sync always or disabled: no difference) Linux 2.6.32 (sync or async: no difference) It makes no difference if the NFS server is on the same machine (as a virtual storage appliance) or on a different host Guest OS tested, showing problems: Windows 7 64 Bit (using CrystalDiskMark, latency spikes happen mostly during preparing phase) Linux 2.6.32 (fsync-tester + ioping) Linux 2.6.38 (fsync-tester + ioping) I could not reproduce this problem on Linux 2.6.18 VMs. Another workaround is to use virtual IDE disks (vs SCSI/SAS), but that is limiting performance and the number of drives per VM. Update 2011-06-30: The latency spikes seem to happen more often if the application writes in multiple small blocks before fsync. For example fsync-tester does this (strace output): pwrite(3, "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa"..., 1048576, 0) = 1048576 fsync(3) = 0 ioping does this while preparing the file: [lots of pwrites] pwrite(3, "********************************"..., 4096, 1036288) = 4096 pwrite(3, "********************************"..., 4096, 1040384) = 4096 pwrite(3, "********************************"..., 4096, 1044480) = 4096 fsync(3) = 0 The setup phase of ioping almost always hangs, while fsync-tester sometimes works fine. Is someone capable of updating fsync-tester to write multiple small blocks? My C skills suck ;) Update 2011-07-02: This problem does not occur with iSCSI. I tried this with the OpenIndiana COMSTAR iSCSI server. But iSCSI does not give you easy access to the VMDK files so you can move them between hosts with snapshots and rsync. Update 2011-07-06: This is part of a wireshark capture, captured by a third VM on the same vSwitch. This all happens on the same host, no physical network involved. I've started ioping around time 20. There were no packets sent until the five second delay was over: No. Time Source Destination Protocol Info 1082 16.164096 192.168.250.10 192.168.250.20 NFS V3 WRITE Call (Reply In 1085), FH:0x3eb56466 Offset:0 Len:84 FILE_SYNC 1083 16.164112 192.168.250.10 192.168.250.20 NFS V3 WRITE Call (Reply In 1086), FH:0x3eb56f66 Offset:0 Len:84 FILE_SYNC 1084 16.166060 192.168.250.20 192.168.250.10 TCP nfs > iclcnet-locate [ACK] Seq=445 Ack=1057 Win=32806 Len=0 TSV=432016 TSER=769110 1085 16.167678 192.168.250.20 192.168.250.10 NFS V3 WRITE Reply (Call In 1082) Len:84 FILE_SYNC 1086 16.168280 192.168.250.20 192.168.250.10 NFS V3 WRITE Reply (Call In 1083) Len:84 FILE_SYNC 1087 16.168417 192.168.250.10 192.168.250.20 TCP iclcnet-locate > nfs [ACK] Seq=1057 Ack=773 Win=4163 Len=0 TSV=769110 TSER=432016 1088 23.163028 192.168.250.10 192.168.250.20 NFS V3 GETATTR Call (Reply In 1089), FH:0x0bb04963 1089 23.164541 192.168.250.20 192.168.250.10 NFS V3 GETATTR Reply (Call In 1088) Directory mode:0777 uid:0 gid:0 1090 23.274252 192.168.250.10 192.168.250.20 TCP iclcnet-locate > nfs [ACK] Seq=1185 Ack=889 Win=4163 Len=0 TSV=769821 TSER=432716 1091 24.924188 192.168.250.10 192.168.250.20 RPC Continuation 1092 24.924210 192.168.250.10 192.168.250.20 RPC Continuation 1093 24.924216 192.168.250.10 192.168.250.20 RPC Continuation 1094 24.924225 192.168.250.10 192.168.250.20 RPC Continuation 1095 24.924555 192.168.250.20 192.168.250.10 TCP nfs > iclcnet_svinfo [ACK] Seq=6893 Ack=1118613 Win=32625 Len=0 TSV=432892 TSER=769986 1096 24.924626 192.168.250.10 192.168.250.20 RPC Continuation 1097 24.924635 192.168.250.10 192.168.250.20 RPC Continuation 1098 24.924643 192.168.250.10 192.168.250.20 RPC Continuation 1099 24.924649 192.168.250.10 192.168.250.20 RPC Continuation 1100 24.924653 192.168.250.10 192.168.250.20 RPC Continuation 2nd Update 2011-07-06: There seems to be some influence from TCP window sizes. I was not able to reproduce this problem using FreeNAS (based on FreeBSD) as a NFS server. The wireshark captures showed TCP window updates to 29127 bytes in regular intervals. I did not see them with OpenIndiana, which uses larger window sizes by default. I can no longer reproduce this problem if I set the following options in OpenIndiana and restart the NFS server: ndd -set /dev/tcp tcp_recv_hiwat 8192 # default is 128000 ndd -set /dev/tcp tcp_max_buf 1048575 # default is 1048576 But this kills performance: Writing from /dev/zero to a file with dd_rescue goes from 170MB/s to 80MB/s. Update 2011-07-07: I've uploaded this tcpdump capture (can be analyzed with wireshark). In this case 192.168.250.2 is the NFS server (OpenIndiana b148) and 192.168.250.10 is the ESXi host. Things I've tested during this capture: Started "ioping -w 5 -i 0.2 ." at time 30, 5 second hang in setup, completed at time 40. Started "ioping -w 5 -i 0.2 ." at time 60, 5 second hang in setup, completed at time 70. Started "fsync-tester" at time 90, with the following output, stopped at time 120: fsync time: 0.0248 fsync time: 5.0197 fsync time: 5.0287 fsync time: 5.0242 fsync time: 5.0225 fsync time: 0.0209 2nd Update 2011-07-07: Tested another NFS server VM, this time NexentaStor 3.0.5 community edition: Shows the same problems. Update 2011-07-31: I can also reproduce this problem on the new ESXi build 4.1.0.433742.

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  • Advice for printing a colored page

    - by eSKay
    If I need to print a colored document on a black and white printer, then which one of these options do you think is better: desaturating the document first and then sending it to printer giving the print command on the colored document only (trusting the printer for the job) I know most of us use the second option. I want to know if there is any possible advantage of using the first option?

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  • Full Disk Encryption for Mac (Not PGP)

    - by Andy
    I purchased PGP Whole Disk Encryption for my Macbook Pro, and it's exactly what I need. After the Symantec acquisition, PGP no longer sells single licenses of the software so I can't purchase a second copy for my iMac. Since I can no longer buy PGP Whole Disk Encryption, can anyone suggest an alternative? I'm currently using Filevault, but I specifically want whole disk encryption. I'm using a quad-core i7 iMac running Snow Leopard and I'm also hoping to protect my Windows Bootcamp partition.

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  • TomCat starts, but does not load properly

    - by user37136
    Hey guys, I've been working on this for a day now and still don't know what's wrong. I am essentially building a second environment for our web and app server. I got apache to load up just fine, but tomcat is proving to be difficult. It appears to start and load just fine, but when it comes to loading our application, its just got stuck for 2-5 minutes and then shut down. Here is the log on the original machine where it works fine: 2010-02-12 11:52:40,506 INFO Web application servlet context is initializing... 2010-02-12 11:52:40,540 DEBUG Servlet context attribute added: select_jobType=[{1,Undefined}, {100,Completion}, {200,Plugging}, {300,R+M}, {400,Workover}, {500,Swab - tubing}, {600,Swab - fluid}] 2010-02-12 11:52:40,540 DEBUG Servlet context attribute added: select_jobTaskType=[{1,Undefined}, {100,Rod part}, {200,Tubing leak}, {300,Pump change}, {400,Stripping job}, {500,Long stroke}, {600,A/L optimization}] 2010-02-12 11:52:40,541 DEBUG Servlet context attribute added: select_wellType=[{1,Undefined}, {100,Rod pump}, {200,ESP}, {300,Injector}, {400,PC pump}, {500,Co-Rod}, {600,Flowing}, {700,Storage}] 2010-02-12 11:52:40,541 DEBUG Servlet context attribute added: select_assetType=[{1,Rig}, {100,Disabled rig}] 2010-02-12 11:52:40,542 DEBUG Servlet context attribute added: select_state=[{AL,Alabama}, {AK,Alaska}, {AZ,Arizona}, {AR,Arkansas}, {CA,California}, {CO,Colorado}, {CT,Connecticut}, {DE,Delaware}, {FL,Florida}, {GA,Georgia}, {HI,Hawaii}, {ID,Idaho}, {IL,Illinois}, {IN,Indiana}, {IA,Iowa}, {KS,Kansas}, {KY,Kentucky}, {LA,Louisiana}, {ME,Maine}, {MD,Maryland}, {MA,Massachusetts}, {MI,Michigan}, {MN,Minnesota}, {MS,Mississippi}, {MO,Missouri}, {MT,Montana}, {NE,Nebraska}, {NV,Nevada}, {NH,New Hampshire}, {NJ,New Jersey}, {NM,New Mexico}, {NY,New York}, {NC,North Carolina}, {ND,North Dakota}, {OH,Ohio}, {OK,Oklahoma}, {OR,Oregon}, {PA,Pennsylvania}, {RI,Rhode Island}, {SC,South Carolina}, {SD,South Dakota}, {TN,Tennessee}, {TX,Texas}, {UT,Utah}, {VT,Vermont}, {VA,Virginia}, {WA,Washington}, {WV,West Virginia}, {WI,Wisconsin}, {WY,Wyoming}, {ACO,Atlantic Coast Offshore}, {FOAK,Federal Offshore Alaska}, {NGOM,Northern Gulf of Mexico}, {PCO,Pacific Coastal Offshore}] 2010-02-12 11:52:40,542 INFO KeyviewContextMonitor.contextInitialized: Loaded drop-down lists:com/key/portal/web/common/lists.properties 2010-02-12 11:52:40,937 DEBUG Servlet context attribute added: org.apache.struts.action.SERVLET_MAPPING=*.do 2010-02-12 11:52:40,937 DEBUG Servlet context attribute added: org.apache.struts.action.ACTION_SERVLET=org.apache.struts.action.ActionServlet@155d578 2010-02-12 11:52:41,939 DEBUG Servlet context attribute added: org.apache.struts.action.MODULE=org.apache.struts.config.impl.ModuleConfigImpl@e08e9d 2010-02-12 11:52:41,962 DEBUG Servlet context attribute added: org.apache.struts.action.FORM_BEANS=org.apache.struts.action.ActionFormBeans@b31c3c 2010-02-12 11:52:41,967 DEBUG Servlet context attribute added: org.apache.struts.action.FORWARDS=org.apache.struts.action.ActionForwards@102c646 2010-02-12 11:52:41,973 DEBUG Servlet context attribute added: org.apache.struts.action.MAPPINGS=org.apache.struts.action.ActionMappings@127276a 2010-02-12 11:52:41,974 DEBUG Servlet context attribute added: org.apache.struts.action.MESSAGE=org.apache.struts.util.PropertyMessageResources@18cae13 2010-02-12 11:52:41,984 DEBUG Servlet context attribute added: org.apache.struts.action.PLUG_INS=[Lorg.apache.struts.action.PlugIn;@f875ae 2010-02-12 11:52:46,816 INFO Sucessfully loaded application properties com/key/core/properties/application On my second environment, it didn't execute the last line. I start tomcat with the exact same command line !/bin/ksh export JAVA_HOME=/app/java export CATALINA_HOME=/app/tomcat export CATALINA_BASE=/app/keyview/appserver CATALINA_OPTS=" -Xms128m -Xmx800m -Dapplication.props=com/key/core/properties/application -Dlog4j.configuration=com/key/core/log/log4j.xml -Djava.awt.headless=true -Dlog4j.debug" export CATALINA_OPTS ${CATALINA_HOME}/bin/startup.sh I bolded the line that I think are in error. Thanks

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  • dynamic subdomains problem?

    - by Solomon Saleh
    im trying to add a wildcard subdomain system to my webserver, but its still not working, this is the steps i took: i made a new file vhost.conf in the directory var/www/vhosts/www.kornar.com/conf/vhost.conf and i put ServerAlias *.domain.com then second of all i made a new dns wildcard on plesk CNAME *.domain.com kornar.com and then i edited my .htaccess file Options +FollowSymLinks RewriteEngine on RewriteCond %{HTTP_HOST} ^(^.*)\.kornar.com RewriteRule (.*) user.php?user=%1 normally my url would be http://www.kornar.com/user.php?user=solomon but now i want to like this http://solomon.kornar.com but the steps i took still deosnt work :)) whats happening here

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  • High Availability with 2 servers?

    - by Tom R
    Is it possible to have a high availability setup with 2 servers? Running Windows Web Server 2008 and MSSQL Web Edition (as I know Express isn't supported)? Getting to the point where our one dedicated server needs scaled out and going to a second server already more than doubles the cost as need to use Web Edition rather than Express (db is only 500MB).

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  • Just to not to be ingnorant.

    - by atch
    Could anyone explain to me why is it that producers of processors claim that their processor can perform so many thousands (or millions) operations per second and yet typical program (Word, VS etc.) on my machine with 4GB, 3500hz starts with no less than 10sek. Have to mention that I've just formatted disk and tick any necessarry boxes to optimize my machine. So if for example outlook starts in 10 sek I wonder how many millions of operations have to be performed to run such program? Thanks

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  • Repackage m4v file

    - by Daniel Huckstep
    I have some m4v files I made with Handbrake where the AC3 audio channel was the first one, and the stereo was the second. This causes problems with some things (like Quicktime) so I want to repackage the file such that the stereo track is the first audio track. I don't want to re-encode things. Can I do this? Can I do it for free?

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  • osx: launch a program when another program opens

    - by metasequoia
    I would like a method for starting a program when another program starts. Specifically, I’d like a to open a MS Word document and have my citation manager open simultaneously (EndNote supports this function within MS Word preferences, but I recently switched citation managers). I’d like to be able to open any existing Word document on my drive and trigger the second program. The same question was recently answered for the windows 7 environment.

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  • Tortoise SVN appears to freeze Explorer

    - by mafutrct
    When updating a repository using Tortoise SVN, Explorer on Windows XP tends to choke and freeze in regular intervals. Something like 4 seconds freeze, 1 second fluent work. I imagine this may be caused by the (too many) svn:externals? Is this a known issue? Do you know of a way to fix this?

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  • scheck_sip in nagios

    - by hussein abou esber
    hi when i try to check A SIP account the command returns (SIP timeout:No response from SIP server after 15 second) remark :the same result is observed on the nagios web interface and if i try from the command line it is the same any body had a solution plz im in a such a hurry since im preparing a project to be presented in my college thanks

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  • Tool to compute SHA256 Tree Hash

    - by Benjamin
    I've started using AWS Glacier, and noticed that it hashes the files using an algorithm called SHA-256 Tree Hash. To my surprise, this algorithm is different from SHA-256, so I can't use the tools I'm used to, to compare hashes and verify file integrity. Do you know a Windows tool, if possible integrated in the context menu, to compute the SHA-256 Tree Hash of a file? I'd also accept a Linux command-line tool, as a second choice :-)

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  • Which cloud service is best?? can you order it??

    - by mathew
    Hi there are many cloud services out there but famous are mentioned below...can any one tell me which one is first,second,third etc....in terms of money,performance and reliability.. 1) Amazon 2) Rackspace 3) Softlayer 4) Vps.net I dont know other actually I am only looking for Linux services .... Mathew

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  • Small Business Server services will not start, and remote desktop and UAC are broken

    - by Stephen Jennings
    Yesterday I began setting up a server with Windows Small Business Server 2008. All I am configuring it for right now is to be a domain controller and Exchange server. I completed the initial setup of SBS then started looking through different connection options (allowing VPN versus using a TS Gateway). After I rebooted one time, I started having three not-obviously-related issues: First, I could no longer remote desktop into the computer. I ran TCPView and saw that it was no longer listening on port 3389. I checked everything in Terminal Service Configuration but everything shows the computer ought to be allowing connections. Also, when I tried to use anything that required user account control elevation, the UAC dialog never popped up and the program that was waiting just froze. If I try to run "regedit" from the Run box, for example, it never appears. When I run in safe mode which does not run with UAC, I was able to access everything. I didn't want to deal with it, so I turned off UAC and rebooted. Finally, in the Windows SBS Console, there are status indicators for Security, Updates, Backup, and Other Alerts. The first three get stuck saying "Querying". Looking in the computer alerts, I have events showing the following services stopped: Background Intelligent Transfer Service KtmRm for Distributed Transaction Coordinator Distributed Transaction Coordinator Microsoft Exchange Information Store Microsoft Exchange System Attendant Microsoft Exchange Transport Windows Remote Management Update Services Windows Update I figured I must have configured something wrong accidentally and I couldn't find anything using Google explaining what might be the case, so I just decided to format the hard drive and reinstall SBS from scratch. I did this and everything was working last night, but I just turned the machine back on and it is doing the same thing again! On my second install, I did not configure anything except the following (all from SBS Console): Connect to the Internet (set IP and router address) Turn off customer feedback. Set up internet address. Decline to use a Smart Host for email. Added one standard user account. Since this happened again and I was very careful the second time not to configure anything outside of the SBS Console, I feel like there's something else going on. Right now the machine is on an isolated network that does have internet access. My desktop is the only other machine plugged into this network. Any and all help is appreciated (before I tear my hair out!)

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  • Simultaneonus NX client connections

    - by Ja Sam
    I would like to have two separate NX connections for the same username going from one dual-monitor client to NX server. The idea is to get two separate same username KDE sessions. When I try to do it the most obvious way (by starting one NX client on each separate monitor), second connection just over takes the first one. Any idea on how to do this?

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  • Areca 1280ml RAID6 volume set failed

    - by Richard
    Today we hit some kind of worst case scenario and are open to any kind of good ideas. Here is our problem: We are using several dedicated storage servers to host our virtual machines. Before I continue, here are the specs: Dedicated Server Machine Areca 1280ml RAID controller, Firmware 1.49 12x Samsung 1TB HDDs We configured one RAID6-set with 10 discs that contains one logical volume. We have two hot spares in the system. Today one HDD failed. This happens from time to time, so we replaced it. Upon rebuilding a second disc failed. Normally this is no fun. We stopped heavy IO-operations to ensure a stable RAID rebuild. Sadly the hot-spare disc failed while rebuilding and the whole thing stopped. Now we have the following situation: The controller says that the raid set is rebuilding The controller says that the volume failed It is a RAID 6 system and two discs failed, so the data has to be intact, but we cannot bring the volume online again to access the data. While searching we found the following leads. I don't know whether they are good or bad: Mirroring all the discs to a second set of drives. So we would have the possibility to try different things without loosing more than we already have. Trying to rebuild the array in R-Studio. But we have no real experience with the software. Pulling all drives, rebooting the system, changing into the areca controller bios, reinserting the HDDs one-by-one. Some people are saying that the brought the system online by this. Some are saying that the effect is zero. Some say, that they blew the whole thing. Using undocumented areca commands like "rescue" or "LeVel2ReScUe". Contacting a computer forensics service. But whoa... primary estimates by phone exceeded 20.000€. That's why we would kindly ask for help. Maybe we are missing the obvious? And yes of course, we have backups. But some systems lost one week of data, thats why we'd like to get the system up and running again. Any help, suggestions and questions are more than welcome.

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  • Windows 7 sets wrong time

    - by P a u l
    My win7-64 ultimate has set the clock ahead 2 hours. It appears to have done it in increments of 1 hour, with the second 1 hour shift made sometime today. The first, correct, shift for Daylight Savings was sunday morning. In the clock settings it says Mountain Time UTC-7, but the official time should be Mountain Time UTC-6.

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