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• Why is only one wget command working in my crontab?

  - by afEkenholm

  I wish to fetch content from a PHP script on my server two times a day, altering a query variable lang to set what language we want, and save this content in two language specific files. This is my crontab: */15 * * * * ~root/apache.sh > /var/log/checkapache.log 10 0 * * * wget -O /path/to/file-sv.sql "http://mydomain.com/path/?lang=sv" 11 0 * * * wget -O /path/to/file-en.sql "http://mydomain.com/path/?lang=en" The problem is that only the first wget command line is being executed (or to be precise: the only file that is being written is /path/to/file-sv.sql). If I switch the second and the third row, /path/to/file-en.sql gets written instead. The first line always runs as expected, no matter where it is. I then tried using lynx -dump "http://mydomain.com/path/?lang=xx" > /path/to/file-xx.sql to no avail; still only the first lynx line executed successfully. Even mixing wget and lynx did not change this! Getting kinda desperate! Am I missing something? There are thousands of articles on crontab (combined with) wget or lynx, but all seems to cover basic setups and syntax. Does anyone got a clue of what I am doing wrong? Thanks, Alexander

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• why would resetting the Netgear N300 router fix my Win 7 laptop's slow wifi?

  - by rjnagle

  In the past day the wifi download speeds of my Win 7 HP 64 bit laptop have slowed considerably. I am trying to troubleshoot the problem and to figure out whether it's hardware related (i.e., is the Intel(R) Centrino(R) Wireless-N 2230 the problem?) or router related. I have a Netgear N300 router connected to my modem. I'm using Speedtest to measure my speed. First, during my problem state, my ipad can download and upload at normal speeds. It's only my Win 7 laptop which is having problems. Because my ipad downloads at normal speeds, that would tell me that the problem is specific to the laptop (either HW or SW). But when I restarted my Netgear router, the laptop wifi problems disappeared. That just doesn't make sense. If we know that one device can connect properly to the router, why would a laptop have problems? What are some possible reasons why this might happen? Also, during my problem state, I noticed that on my laptop upload speeds were faster than my download speeds. Anybody have a guess about what might cause upload speeds on one device to be faster than another? Is there any actions i could take (or options to enable) so this problem won't occur. (I initially thought my problem might be software related or memory related -- Norton AV or browser plugins. But even after I disabled everything and made sure memory footprint was minimal, the slowdown was still occurring -- and it solved itself altogether when the router was reset).

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• Fresh install CentOS 6.4 64b with directadmin slowly consumes all memory and crashes

  - by Coen Ponsen

  Dear server fault community, This is my first question on server fault, i'm new to server (mis)configuration so please forgive me for asking something stupid :) I'm running Directadmin on a CentOS 6.4 64b with 4GB memory and over 10000Gh virtual machine. I migrated my websites because my former vps couldn't keep up anymore. Only half of the websites from this 1GB machine were migrated jet. So the migration is still in progress and already my server crashes every day. The server performance up until that moment is perfect. The directadmin log files show nothing out of the ordinary. Yesterday only the mysql server crashed but it also crashed the entire machine before. The memory usage in DA seems to be normal: directadmin directadmin (pid 3923 22158 22159 22160 22161 22162 )8.75 MB dovecot dovecot (pid 3851 ) 47.8 MB exim exim (pid 1350 ) 1.29 MB httpd (pid 21525 21528 21529 21530 21531 21532 21546 21571 21742 21743 21744 )490.4 MB mysqld mysqld (pid 1299 ) 287.8 MB named named (pid 3807 ) 16.3 MB proftpd proftpd (pid 1481 ) 1.91 MB sshd sshd (pid 1173 21494 ) 5.16 MB Restarting services immediately frees up memory, but slowly over time the memory usage increases(about 24 hours to crash). The commands: # sync # echo 3 > /proc/sys/vm/drop_caches Will free al memory correct. I could just create a cronjob but it seems the wrong way around to me. I can't seem to pinpoint the cause. Any advices, references or tips are highly appreciated! Greetings, Coen edit: free -m : after drop_caches: total used free shared buffers cached Mem: 3830 735 3095 0 0 21 -/+ buffers/cache: 712 3117 Swap: 991 0 991 I'll post another one this evening.

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• How do I tell Windows to use 802.11 in preference to 3G?

  - by Jon Skeet

  I have a Samsung NC-10 netbook which I take to work every day. Most of the time I use it just on the train/bus, but I also use it at work and home. It has a built-in 3G card which I want to use when travelling, but I'd prefer to use wifi when I'm at work or home, for obvious reasons. Unfortunately, if the 3G connection is up, Windows appears to use that in preference to wifi. Starting up and shutting down the 3G modem is a bit of a pain - it's not hard as such, just a bit inconvenient. Ideally I'd like it to always be up, and even have the connection itself up all the time, but without routing traffic through it if there's a wifi connection up. This is what my Android phone does, for example. Is there somewhere in Windows which lets me express an ordering for network interfaces? I suspect the routing table may be relevant, but it's a bit of a pain to mess around with. I'd really expect there to be a simple GUI way of setting this up - after all, it would equally be useful when dealing with wired vs wifi connections. I'm currently using Windows XP Home, but Windows 7 answers would also be useful as I'll be migrating soon.

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• What diagnostics are safe to run on an SSD drive?

  - by Peter Mounce

  I have a MacBook Pro (late 2010) with a Crucial RealSSD 256Gb in it; 60Gb is given to the Windows 7 x64 BootCamp partition. I have a USB-attached 500Gb drive for (most) data. In the last day or so, I've had a BSOD and several OS freezes (both Mac OSX 10.6.6 and Win7). The system in both cases will boot fine (at the moment!) and then run things fine, then some time later a program will stop responding, followed shortly thereafter by the system as a whole, forcing a reboot. This smacks to me of a storage problem. Given that I have an SSD and not a regular magnetic HDD, what are my next steps, in both OS'? I haven't seen anything pertinent in Windows' event-log. I'm not sure of the equivalent place to look in OSX; it's never given me issue to find out. What are my options for attempting to save my data from the SSD to another drive, given that after some small amount of time (eg half an hour), the OS stops responding? What are the recommended next steps?

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• Why is my rsync so slow compared to pure cp or even scp?

  - by nfm

  I'm transfering the files from Linux to Windows 7 via a mounted share (the share is mounted from Windows on Linux).. I'm copying lots of data (i.e. nearly a TB) from the old to the new machine within my LAN. I'm unfortunate enough already that I only have 100MBit. Naturally I blindly used rsync but already wondered after a day why it feels so slow. Enabling the progress meter showed my a transfer rate of about 2MBit/s . So I took a reasonable big file (800MB) and tracked the transfer timing: cp : 05:33 scp (*): 06:33 rsync : 21:51 *) scp via localhost to the same Linux machine directly onto the share; completely useless but provided a progress meter The tests were as simple as (cp|scp|rsync) <source> <destination> No special arguments except host/port for scp. I even tried the -W switch for rsync but cancelled after ten minutes. rsync is 3.0.3 running on Lenny. To be able to interrupt the copy process anytime and resume lead me to rsync, but now I think I seriously need to reconsider this requirement. How's such a big difference possible?

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• iptables drops some packets on port 80 and i don't know the cause.

  - by Janning

  Hi, We are running a firewall with iptables on our Debian Lenny system. I show you only the relevant entries of our firewall. Chain INPUT (policy DROP 0 packets, 0 bytes) target prot opt in out source destination ACCEPT all -- lo * 0.0.0.0/0 0.0.0.0/0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED ACCEPT tcp -- * * 0.0.0.0/0 0.0.0.0/0 tcp dpt:80 state NEW Chain OUTPUT (policy DROP 0 packets, 0 bytes) target prot opt in out source destination ACCEPT all -- * lo 0.0.0.0/0 0.0.0.0/0 ACCEPT all -- * * 0.0.0.0/0 0.0.0.0/0 state RELATED,ESTABLISHED LOGDROP all -- * * 0.0.0.0/0 0.0.0.0/0 Some packets get dropped each day with log messages like this: Feb 5 15:11:02 host1 kernel: [104332.409003] dropped IN= OUT=eth0 SRC= DST= LEN=1420 TOS=0x00 PREC=0x00 TTL=64 ID=18576 DF PROTO=TCP SPT=80 DPT=59327 WINDOW=54 RES=0x00 ACK URGP=0 for privacy reasons I replaced IP Addresses with and This is no reason for any concern, but I just want to understand what's happening. The web server tries to send a packet to the client, but the firewall somehow came to the conclusion that this packet is "UNRELATED" to any prior traffic. I have set a kernel parameter ip_conntrack_ma to a high enough value to be sure to get all connections tracked by iptables state module: sysctl -w net.ipv4.netfilter.ip_conntrack_max=524288 What's funny about that is I get one connection drop every 20 minutes: 06:34:54 droppedIN= 06:52:10 droppedIN= 07:10:48 droppedIN= 07:30:55 droppedIN= 07:51:29 droppedIN= 08:10:47 droppedIN= 08:31:00 droppedIN= 08:50:52 droppedIN= 09:10:50 droppedIN= 09:30:52 droppedIN= 09:50:49 droppedIN= 10:11:00 droppedIN= 10:30:50 droppedIN= 10:50:56 droppedIN= 11:10:53 droppedIN= 11:31:00 droppedIN= 11:50:49 droppedIN= 12:10:49 droppedIN= 12:30:50 droppedIN= 12:50:51 droppedIN= 13:10:49 droppedIN= 13:30:57 droppedIN= 13:51:01 droppedIN= 14:11:12 droppedIN= 14:31:32 droppedIN= 14:50:59 droppedIN= 15:11:02 droppedIN= That's from today, but on other days it looks like this, too (sometimes the rate varies). What might be the reason? Any help is greatly appreciated. kind regards Janning

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• how is the the linux console displayed to the user and how does the user go about changing the conso

  - by Chris

  I've been searching for the last two day on trying to understand how the console displays itself to the user and how to change the console settings. I've had some luck along the way but nothing that I've found has giving me a real clear explanation of how the console is displayed or how to change or control it's display settings. Some examples that of what I'm looking for are as follows: How is the console displayed on the screen? I know with X11 it uses your graphics card driver to display graphics to the screen, but how is the consoles text mode handled? Could some one ether explain this to me or point me to an in-depth overview of it all? Is it possible to have multi-head support in console mode with separate tty's on each screen? If so how would I go about setting this up? How would you go about changing the size of the console display from the default 80x25 to a custom size? I'm testing anything I find on a debian testing build, which is just the minimal base install on a virtual box. In time I will be using this information to setup my main system which is multi-head with 3 monitors. I would like to be able to support all three displays in console mode if possible.

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• IPTABLES syntax help to forward Remote Desktop requests to a VM [CentOS host]

  - by NVRAM

  I've a VM running MSWindows XP hosted on my CentOS 5.4 machine. I can rdesktop into it from the hosting machine and work just fine using the private ddress (192.168.122.65), but I now need to allow Remote Desktop access from other computers (not just the machine hosting the VM). [Edit] I only need to allow access for a day or so, so don't want to add a NIC (for XP activation reasons). Could someone help me with the iptables syntax? The VM is on a private/virtual network: 192.168.122.65 and my CentOS machine is on a physical network, at 10.1.3.38 (and 192.168.122.1 as the GW for the virtual net). I found this question, but none of the answers seemed to work and I'm a bit timid at blindly trying variations. My FORWARD rules are as listed. Thanks in advance. # iptables -L FORWARD Chain FORWARD (policy ACCEPT) target prot opt source destination ACCEPT all -- anywhere 192.168.122.0/24 state RELATED,ESTABLISHED ACCEPT all -- 192.168.122.0/24 anywhere ACCEPT all -- anywhere anywhere REJECT all -- anywhere anywhere reject-with icmp-port-unreachable REJECT all -- anywhere anywhere reject-with icmp-port-unreachable RH-Firewall-1-INPUT all -- anywhere anywhere [Edit] If I do play "blindly" is there a simple way to reset the settings on CentOS (a la service network restart)?

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• rdp allow client reconnect without password prompt after several hours

  - by Tom

  Let me describe the setup first: client PC with several rdp sessions to local servers, all opened from saved rdp sessions with stored passwords, using the standard windows rdp client. several windows servers on the LAN, with varying server OS: windows server 2003, 2008, and even 2012 now. When I log onto my PC I open up rdp sessions to all those servers, and keep them open all the time for various reasons. Overnight the client PC is put into sleep or hibernate mode, thereby braking the rdp connections. On the next day when I wake the client PC and login again, the rdp sessions automatically try to reconnect to the servers, and this leads to the question: starting with server 2008 something apparently changed in the rdp server config, as all servers with 2008, 2008r2 and 2012 will prompt for the password in the rdp session, whereas the 2003 server rdp connections will re-establish without the password prompt. Apparently there is a timeout setting on 2008+ that, when exceeded, requires a reauthentication. Is there any way to setup the 2008+ servers to behave like 2003 did? I'd like the rdp sessions to reconnect without a password prompt even after a several hour disconnect.

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• Log connections to program

  - by Zac

  Besides for using iptables to log incoming connections.. Is there a way to log established inbound connections to a service that you don't have the source to (suppose the service doesn't log stuff like this on its own)? What I'm wanting to do is gather some information based on who's connecting to be able to tell things like what times of the day the service is being used the most, where in the world the main user base is, etc. I am aware I can use netstat and just hook it up to a cron script, but that might not be accurate, since the script could only run as frequently as a minute. Here is what I am thinking right now: Write a program that constantly polls netstat, looking for established connections that didn't appear in the previous poll. This idea seems like such a waste of cpu time though, since there may not be a new connection.. Write a wrapper program that accepts inbound connections on whatever port the service runs on, but then I wouldn't know how to pass that connection along to the real service. Edit: Just occurred to me that this question might be better for stackoverflow, though I am not certain. Sorry if this is the wrong place.

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• MySQL Memory Limit Windows Server 2003

  - by Matt

  I am running MySQL 5.0.51a on Windows Server 2003 Standard Edition on an HP DL580 G4 with 3GB installed. One of my database tables has grown to 5.3 GB with an index file of 2.5 GB, which I believe is causing MySQL to be slow due to having to constantly load and unload the index file when updates are made to the table. The server itself seems to be performing OK because MySQL is only using about 500MB of memory (there are other apps running on the system, but MySQL uses the most memory). The table is fairly active with new records getting adding all during day but no deletes, ever. The MySQL server has up to 600 connections allowed, but only small number (10 or 20) would actually be writing to this table. I increased the memory limits in MySQL but since the max connections is so high I don't think I can give each connection 1GB without risking a problem. Is there some tuning that would let just certain connections get a lot of memory? So I have started to look for alternatives to avert the crisis I know is coming soon. Some of the options I have: Upgrade to Server 2003 Enterprise to install 64GB of memory. Question: would 32 bit MySQL be able to access more than 2GB? Would that be 2GB per thread? That would still be smaller than the index table size so it might not solve the problem completely, but it would be better than now. Upgrade to Server 200x 64 bit and MySQL 64 bit. Switch to a *nix 64 bit server. If anybody has suggestions for things to do in the meantime, opinions on which way to go, or other things that I have overlooked I would appreciate the help. Thanks

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• Motorola Surfboard SB6121 modem conected to 2WIREi38HG wireless router but there's no internet access

  - by Jessica

  I have just switched to Comcast cable internet from AT&T Uverse and I was hoping to use the 2WIRE wireless router with the new Surfboard modem so I can have wireless access. I messed around with some settings and got it working for my laptop (I'm not terribly well versed in computer stuff; I think it was mostly luck) for about a week. The other day I tried to get online and there was no internet connection. I restarted the equipment with no success and then plugged the modem directly into the laptop. This worked, so I knew there was no outage. I connected the ethernet cord to the router and a second cord to my laptop and that worked, too. But when I tried again just with the wireless the laptop connects to the router, but doesn't recognize it or find an internet connection. I tried to go to http://gateway.2Wire.net to fiddle with the settings, but all I get is a Server Not Found page. I tried to check the ip address but this is really kind of over my head and I get different things checking it while plugged into only the modem vs when I plug into the router. Can anyone help? The frustrating thing is that I had it working for awhile, so I know it can do it!

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• HD working with IDE USB adapter but not recognised by bios

  - by Rajeeva

  I have a Windows XP Pentium III desktop with two hard drives. The first one has the OS and is luckily working. The second drive on the secondary master IDE channel few days back was unable to read some files and since then for some time it was failing and reviving intermittently and now it is always showing as failed on the IDE channel When the HD was intermittenly failing, I was able to copy some data from it to the other drive - also during that time if the system was running and the hard disk failed at that time, the system froze and then i had to reboot. then I got a new 80 gb hdd similar (same make - seagate barracuda) to the earlier failing one, a new data cable for the drive and an IDE to USB adapter. the new hard drive i installed in the previous drive's place (secondary master), formatted it and it worked for 1 day and then it also failed - simultaneously i connected the old hd to the IDE/USB adapter and i could view all the data - some of that data i was able to back up from the old hd to the new hd before the new hd failed the new hd i have tried connecting on the primary channel as the slave disk but when i do that then the bios does not detect either the OS drive or the new drive and the system does not boot surprisingly, the older (previously failed) hd and the new hd are both working fine on the usb channel with the IDE/USB adapter. i have ruled out any problem with the secondary channel since the dvd rom i was earlier using as primary slave have now connected to secondary master and it works fine. i am really confused by this behavior on my system. please can anybody try to solve this for me. thanks.

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• Is it possible to trace someone using Google during an online exam?

  - by George

  I happen to be a professor at a reputed college. I want to design an online exam for over 1000 students via around 50 computers right after the vacation ends. Now the problem is that I have heard that many students use Google on a different tab to find answers when no invigilator is around. I want to know if there is a way to backtrace it after the exams via some kind of history or any other possible way. In our university there is a standard system. I am not good with computers but I will try to explain. Each computer uses mozilla to connect to a server centrally located via an IP. The students open it and enter a unique ID and password to start the exams. Many questions are jumbled and different groups of students give exam in a different time slot. Is there any way to trace it since I want to set an example for students so they won't cheat and give exams in an honest way. Additional details: Since the number of computers are less than the number of students, more than 10 students are going to use a single computer on a single day over a period of 10 hours. After this, if I check the history (and let's say someone even forgot to delete the history and I see it), will I able to figure out who among the 10 has done it? Moreover, is it even practical and feasible?

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• Is there a monitoring software suite that will alert me if it has received no activity in a time period?

  - by matt b

  This might be a very basic question, but I am not very familiar with the exact features of Nagios versus Munin versus other monitoring tools. Let's say we have a process that needs to run daily for some very important infrastructure reasons. We've had cases where the process did not run or was otherwise down for a number of days before anyone noticed. I'd like to set up a system that will enable me to easily know when the daily run did not take place for some reason. I can set up this process to send an email on every successful run (or every failed run), but I do not trust that the people receiving this email would notice an absence of an "I'm OK" message. What I am envisioning is some type of "tripwire" service which this V.I.P. (very-important-process) can send a status message to each time it runs, whether successfully or not; and if the "tripwire" service has not received any word from the VIP within a configurable amount of time, it can then send an alert to someone. (The difference between what I envision and the first approach I outlined is a service that sends a message only in abnormal conditions, rather than a service that sends messages each day that the status is normal/OK). Can Nagios be set up to send an alert like this, if it has not heard from a certain service/device/process in N days? Is there another tool out there which does have this feature?

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• Clone a Windows Installation to a 3TB Hard Drive; MBR to GPT

  - by DanBlakemore

  I have Windows 7 Professional 64-bit installed on my desktop. Unfortunately for me and my wallet my hard drive is failing. I have purchased a 3TB hard drive as a replacement for my current 2TB drive. I would like to avoid as much hassle as possible in moving to this new drive so I would like to copy my current partition to the new drive using Gparted. The problem is that I suspect that my current partition is MBR, and I need GPT on my new drive since it is 3TB. Can I simply copy the MBR partition onto the new disk and then convert it to GPT after the fact (can you even convert the type of a partition)? Or would I need to somehow copy the contents of the partition into a GPT partition on the new drive? How do I go about making this transistion? Also, are there any issues I should be wary of booting to a GPT partition? If it matters, my motherboard is 1 year old as of May, 2012. Edit: My motherboard is 1 day old. My old one does not have UEFI compatibility, so I decided to make an upgrade to Intel today given that I would need a UEFI motherboard to use my new HDD. How much can I use a dying hard drive (bad sectors according to Hitachi Drive Fitness Test)? I have assumed not at all, to be safe.

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• BackupExec 12 + RALUS - VERY slow backups

  - by LVDave

  We use Backup Exec 12 and the Remote Agent for Linux/Unix Servers (RALUS) to backup a large RHEL5 system. For various reasons we need to do a daily working set job. These working-set jobs run abysmally slow. The link between the target machine and the BE server is gigabit, and any other type of job runs 1-3GB/min. These working-set jobs start out at perhaps 40MB/min and over the course of the backup job slowly drops down so low that the BE job rate display in the "current jobs" goes blank.. Since we usually are only doing changed-files for one day, the job is usually small and finishes overnight and we don't worry abotu the slowness, but we had some issues with the backup server, and missed about 6 days of fairly heavy work on the Linux box, so this working-set job will be a doozy.. We have support with Symantec, and I've pestered them a lot about this, they've had me run RALUS in debug mode, sent them that log and a VXgather from the BE host and they had no fix/workaround.. To give an idea, I have the mentioned working-set job running for the last 3 1/2 hours and it's backed up just under 10MEGAbytes.... I'm posting this here to see if anybody in the "real world" has seen this/and/or has any ideas what might be causing these abysmally slow jobs, since Symantec seems to be clueless...

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• What's Keeping My Computer Awake?

  - by phantomdata

  First the question; How do I figure out what is preventing my Windows 7 computer from going into sleep mode? Second; some background... I've been struggling with this for a few days and am utterly perplexed. I setup sleep mode on my Windows 7 PC a few weeks ago, and all was well. The PC would sleep as expected and I was snuggly in knowing that my computer was saving power and some wear and tear on the components (we'll leave the 'is it better to sleep' debate for another thread/day, please don't start it). Well, I noticed the other night that my system stopped ever going to sleep. I set the sleep time down to 1 minute and wandered fully away from the PC (ensuring that no errant mouse or keyboard movements would occur) and the PC never went to sleep. I've also observed this over longer intervals as well, such as overnight. I have sleep mode enabled, of course "multimedia settings - When Sharing Media" is set to allow the computer to sleep. "powercfg -lastwake" show nothing of interest, since it never goes to sleep and can't wake up. "powercfg /requests" shows 3 entries - all "[DRIVER] ?". I assume that 2 of these are my mouse and keyboard - as I've recently used them to run the powercfg command. I'm at a loss for the third though. I've unhooked all USB peripherals save for my keyboard and mouse. Wake on LAN is disabled in my BIOS. I know that you can disable all apps from waking/preventing sleep - but I want the ability to remain for those apps that do legitimately need to keep the system awake. So; does anyone know of a way to figure out what the 3rd phantom "[DRIVER] ?" is in powercfg /requests?

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• What are the typical methods used to scale up/out email storage servers?

  - by nareshov

  Hi, What I've tried: I have two email storage architectures. Old and new. Old: courier-imapds on several (18+) 1TB-storage servers. If one of them show signs of running out of disk space, we migrate a few email accounts to another server. the servers don't have replicas. no backups either. New: dovecot2 on a single huge server with 16TB (SATA) storage and a few SSDs we store fresh mails on the SSDs and run a doveadm purge to move mails older than a day to the SATA disks there is an identical server which has a max-15min-old rsync backup from the primary server higher-ups/management wanted to pack in as much storage as possible per server in order to minimise the cost of SSDs per server the rsync'ing is done because GlusterFS wasn't replicating well under that high small/random-IO. scaling out was expected to be done with provisioning another pair of such huge servers on facing disk-crunch issues like in the old architecture, manual moving of email accounts would be done. Concerns/doubts: I'm not convinced with the synchronously-replicated filesystem idea works well for heavy random/small-IO. GlusterFS isn't working for us yet, I'm not sure if there's another filesystem out there for this use case. The idea was to keep identical pairs and use DNS round-robin for email delivery and IMAP/POP3 access. And if one the servers went down for whatever reasons (planned/unplanned), we'd move the IP to the other server in the pair. In filesystems like Lustre, I get the advantage of a single namespace whereby I do not have to worry about manually migrating accounts around and updating MAILHOME paths and other metadata/data. Questions: What are the typical methods used to scale up/out with the traditional software (courier-imapd / dovecot)? Do traditional software that store on a locally mounted filesystem pose a roadblock to scale out with minimal "problems"? Does one have to re-write (parts of) these to work with an object-storage of some sort - such as OpenStack object storage?

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• Windows module installer delaying login, server 2008 R2

  - by Kyle

  We updated our servers this weekend (windows updates), everything went fine except one of our terminal servers now hangs at login with the message, "waiting for windows modules installer." It eventually times out and leaves an event log message that the service has stopped unexpectedly. I have disabled the service and users can now login in a reasonable time frame. However we will need to re-enable the service in order to install further updates. I'm not sure where to start with this one, I'm an entry level admin and my colleagues are on vacation today, thank God this isn't a serious problem. Further details: -It affects all users. -The only third party software on the server is our ERP software and screwdrivers from Tricerat. -The only event log message is that the service has stopped unexpectedly. -The server manager screen does not display any information about roles it just says, "error". -The remote desktop roles all seem to be functioning properly, Remote app works as well as standard RDP. Let me know if there is any further details I can provide, I will be checking this frequently throughout the day.

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• MysqlTunner and query_cache_size dilemma

  - by wbad

  On a busy mysql server MySQLTuner 1.2.0 always recommends to add query_cache_size no matter how I increase the value (I tried up to 512MB). On the other hand it warns that : Increasing the query_cache size over 128M may reduce performance Here are the last results: >> MySQLTuner 1.2.0 - Major Hayden <[email protected]> >> Bug reports, feature requests, and downloads at http://mysqltuner.com/ >> Run with '--help' for additional options and output filtering -------- General Statistics -------------------------------------------------- [--] Skipped version check for MySQLTuner script [OK] Currently running supported MySQL version 5.5.25-1~dotdeb.0-log [OK] Operating on 64-bit architecture -------- Storage Engine Statistics ------------------------------------------- [--] Status: +Archive -BDB -Federated +InnoDB -ISAM -NDBCluster [--] Data in InnoDB tables: 6G (Tables: 195) [--] Data in PERFORMANCE_SCHEMA tables: 0B (Tables: 17) [!!] Total fragmented tables: 51 -------- Security Recommendations ------------------------------------------- [OK] All database users have passwords assigned -------- Performance Metrics ------------------------------------------------- [--] Up for: 1d 19h 17m 8s (254M q [1K qps], 5M conn, TX: 139B, RX: 32B) [--] Reads / Writes: 89% / 11% [--] Total buffers: 24.2G global + 92.2M per thread (1200 max threads) [!!] Maximum possible memory usage: 132.2G (139% of installed RAM) [OK] Slow queries: 0% (2K/254M) [OK] Highest usage of available connections: 32% (391/1200) [OK] Key buffer size / total MyISAM indexes: 128.0M/92.0K [OK] Key buffer hit rate: 100.0% (8B cached / 0 reads) [OK] Query cache efficiency: 79.9% (181M cached / 226M selects) [!!] Query cache prunes per day: 1033203 [OK] Sorts requiring temporary tables: 0% (341 temp sorts / 4M sorts) [OK] Temporary tables created on disk: 14% (760K on disk / 5M total) [OK] Thread cache hit rate: 99% (676 created / 5M connections) [OK] Table cache hit rate: 22% (1K open / 8K opened) [OK] Open file limit used: 0% (49/13K) [OK] Table locks acquired immediately: 99% (64M immediate / 64M locks) [OK] InnoDB data size / buffer pool: 6.1G/19.5G -------- Recommendations ----------------------------------------------------- General recommendations: Run OPTIMIZE TABLE to defragment tables for better performance Reduce your overall MySQL memory footprint for system stability Increasing the query_cache size over 128M may reduce performance Variables to adjust: *** MySQL's maximum memory usage is dangerously high *** *** Add RAM before increasing MySQL buffer variables *** query_cache_size (> 192M) [see warning above] The server has 76GB ram and dual E5-2650. The load is usually below 2. I appreciate your hints to interpret the recommendation and optimize the database configs.

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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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• Did my hard drive fail or is it something else?

  - by Julian

  Last night while I was watched a movie on my laptop the external monitor just went blank and the built-in display froze. Weird I thought, so I restarted it only to be greeted with this heart-breaking message. "No Operating System Found". After a few panicked restarts I accepted the fact that my hard drive might be done :(. Being the resourceful technie that I am, I whipped out Ubuntu Live on my old Flash Drive and was up and running before day break. I cannot access the hard drive through Ubuntu (which I expected) but I also cannot access my DVD drive either! This got me thinking that it might not be the hard drive and some other component that they hdd and the dvd uses. Hopefully this is the case. Which component is the most likely culprit? What tools can I use from Ubuntu Live on my USB flash drive to find out? I'm in a bad place without my hdd, thanks in advance for any assistance provided! P.S. My laptop makes a weird noise when I try to access or eject my DVD within the slot. Also my HDD makes a weird noise sometimes. Not sure how to describe it. System Specs: Dell 1558

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• Cannot get at data in my NAS

  - by Ben

  I've got a bit of an issue that I'm hoping you can help me with. I have an Iomega ix4 as my NAS. This runs Linux and each drive in the box has 2 partitions: one for the OS and RAID info, and the second for the actual data. I had it configured as RAID5. Recently one of the drives failed. At this point all of the data was available, it was just reporting a failed drive. I had a drive of the same capacity (although not the exact same spec) which I swapped in place of the failed drive. It recognised it, and started to rebuild the data protection. So far so good ... or so I thought. The next day, after data protection had finished reconstructing, the NAS was telling me that 4 new drives had been added, and wanted confirmation to overwrite the data. Obviously I declined to do this. I swapped the failed drive back in again, in the hope that it would return to its previous state of the data being accessible, but one failed disk. However it didn't - it still tells me that the NAS has 4 new drives in it. I am hopeful that the actual data is untouched, so what I need to do is get it to rebuild the RAID without touching the data on the disks. I have ssh access, and have run stuff like mdadm --examine to see what I can find. The mdadm.conf file has no entry in the "definitions of existing MD arrays" section. I have not run any actual rebuilding commands as yet, because this is entering an area which I am out of my depth in. Please can someone advise the best way of getting my data? Thanks.

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