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• How reliable is HDD SMART data?

  - by andahlst

  Based on SMART data, you can judge the health of a disk, at least that is the idea. If I, for instance, run sudo smartctl -H /dev/sda on my ArchLinux laptop, it says that the hard drive passed the self tests and that it should be "healthy" based on this. My question is how reliable this information is, or more specifically: If according to the SMART data this disk is healthy, what are the odds of the disk suddenly failing despite this? This assumes the failure is not due to some catastrophic event that impossibly could have been predicted, such as the laptop falling down on the floor causing the drive heads to hit the disk. If the SMART data does not say the disk is in good shape, what are the odds of the disk failing within some amount of time? Is it possible that there will be false positives and how common are these? Of course, I keep backups no matter what. I am mostly curious.

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• Ubuntu 10.04: unable to login after fresh install

  - by Richard

  Hello All, I,ve just installed a fresh copy of Ubunutu 10.04, downloaded a couple of days ago. The installation seemed to go fine. However I can't log in: the login screen just seems to reset and asks me for my password again. It's not an authentication / incorrect password issue. If I stick in a wrong password, I get "Authentication failure". I've googled around, others report the same issue on the Ubuntu forums, but there doesn't seem to be a fix. Does anyone know of a work around or what the problem is? Have 9.10, I might end up just installing that instead. THanks

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• Problem setting up DL360G5 with scsi RAID

  - by ernelli

  I have a problem with reinstalling OS on a DL360G5. The BIOS [F9] do not detect any disc controllers and the HP SmartSetup did not find any compatible controllers. Inside the server, the two SCSI disks are conncted to a RAID controller using BCM8603 chipset. How is disc contoller supposed to be setup? I have tried to do a full BIOS reset. EDIT At the moment we suspect that the Smart Array controller E200i/412205-001 is broken. Are there any status LED's that indicate failure or success during start up? At the moment all LED's are off.

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• Moving a VM from MS Virtual Server R2 to VirtualBox

  - by AngryHacker

  I have a Windows 2000 Professional VM happily running under MS Virtual Server R2 on WindowsXP. I need to move it to a different PC and the only one available is a Mac with VirtualBox on it. Theoretically, VirtualBox accepts .VHD files out of the box, but my attempts to run my VHD on VirtualBox resulted in failure. The Guest OS just keeps rebooting. I've attempted to get help on the VirtualBox forums, and they said that the VM image must first be prepped for the move, but could not give me any specifics. Anyone here know what is specifically involved in moving a Win2k .VHD to VirtualBox on the Mac?

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• How to prepare WiFi for an on-stage demo?

  - by Jeremy White

  Today at WWDC, Steve Jobs gave his keynote and ended up having a failure on-stage when connecting to WiFi. Google had a similar issue a few weeks ago in the same conference center. Please reference the following article for more information. http://news.cnet.com/8301-31021_3-20007009-260.html I am looking for information on how to best prepare a demo which uses a closed wireless network in front of a large audience. Note that the network will be closed, and will not require internet access. What steps can I take to prevent interference from existing WiFi, Bluetooth, etc? How can I best prevent curious/malicious people from trying to intrude on my WiFi network? I am open to recommendations on specific models of routers.

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• Get the "source network address" in Event ID 529 audit entries on Windows XP

  - by Make it useful Keep it simple

  In windows server 2003 when an Event 529 (logon failure) occures with a logon type of 10 (remote logon), the source network IP address is recorded in the event log. On a windows XP machine, this (and some other details) are omitted. If a bot is trying a brute force over RDP (some of my XP machines are (and need to be) exposed with a public IP address), i cannot see the originating IP address so i don't know what to block (with a script i run every few minutes). The DC does not log this detail either when the logon attempt is to the client xp machine and the DC is only asked to authenticate the credentials. Any help getting this detail in the log would be appreciated.

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• Battery backed write cache behavior upon disk change

  - by Halfgaar

  We use 3ware Inc 9650SE SATA-II RAID PCIe RAID controllers with battery backed write cache. Our spare hardware has the same controller. I was wondering; are these controllers smart enough not to sync the cache when the disks have been changed? For example, if I deploy one of those spare machines by putting in the disks of another machine and that spare machine still has pending writes, will it be smart enough not to perform those writes on the replaced array? Edit: my scenario is not really made clear, so let me give an example: server1 goes down because of power supply failure. I put the disks in server2 and start. I repair server1 I put the disks back from server2 in server1 (it's not relevant right now that in reality I would probably keep server2 running). If server1 doesn't have safeguards, it will write to the array, thinking it's simply powering up again, corrupting it.

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• How to restore from file using Symantec NetBackup 7.5

  - by Tony

  I have an install of Symantec NetBackup 7.5 and I want to restore the server from a NetBackup image file. The file was created using NetBackup before I arrived. We had a hardware failure that corrupted this server and it needed to be rebuilt, now we want to restore from this image file. I can't for the life of me figure out how to restore from that file. I've installed the NetBackup application but it can't find the file when using the restore command within the application. If I double-click the file it opens the application then gives me the same "can't find any NetBackup files" error. I also can't simply drag the file into the NetBackup window. Any advice on how I restore from this file would be appreciated, thank you.

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• Symantec CPS / Backup Exec 11D Service stuck in "Starting" Status

  - by user42289

  I have two Windows 2003 (one is SE, one is SBS) both SP2, both are Virtual Machines of Microsoft Virtual Server 2005 R2. All of a sudden about 2 weeks ago, the Symantec Backup Exec / CPS 11D stopped working on them. One is the Media server, one is our Exchange 2003 Server. There is another copy of CPS on our file server that the service is running fine on. However the one that is fine is not a VM. When I say stop working, the "backup exec continuous protection agent" service is stuck in "starting" status. On the non Exchange server I've tried uninstalling the last Windows Updates that were run some time around the time of failure. I've tried repairing the install of CPS. I've tried uninstalling it and reinstalling. Exact same problem in the end.

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• Windows 7 connect to Lion file sharing

  - by McKvack

  Trying to access my Mac from a Windows 7 computer, I fail with the infamous error 86 incorrect password. Now this appears to be a well-known problem with countless threads on the internet giving as many "solutions" as there are discussion threads about it (mostly ranging from installing third-party commercial samba servers, to switching to some other protocol, to compiling a plain-vanilla Samba installation - the latter which I will probably do when I give up this :) ) I am stubborn, and I believe there must be some problem here that can be solved or worked around, but there is surprisingly little detail about this problem. It appears to have something to do with a mismatch of authentication methods. Trying to run samba in debug mode: sudo /usr/sbin/smbd -debug -stdout gets me this output when trying to access it from Win 7 ... smb1_dispatch_one [smb_dispatch.cpp:377] dispatching SMB_COM_SESSION_SETUP_ANDX smb1_dispatch_session_setup [session_setup.cpp:261] FIXME erase existing sessions log_gss_error [gssapi_mechanism.cpp:97] gssapi: gss-code: Miscellaneous failure (see text) log_gss_error [gssapi_mechanism.cpp:113] gssapi: mech-code: unknown mech-code 22 for mech unknown What is the problem here, and how do I fix it?

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• How to close the logon process named NtLmSsp ?

  - by Aristos

  I have a windows 2003 server and time to time I am getting many login failures like this one. Logon Failure: Reason: Unknown user name or bad password User Name: administrator Domain: xx.xx.xx.xx Logon Type: 3 Logon Process: NtLmSsp Authentication Package: NTLM Workstation Name: XLHOST Caller User Name: - Caller Domain: - Caller Logon ID: - Caller Process ID: - Transited Services: - Source Network Address: 173.45.70.100 <- hacker Source Port: 4722 AND Logon attempt by: MICROSOFT_AUTHENTICATION_PACKAGE_V1_0 Logon account: user Source Workstation: XLHOST Error Code: 0xC0000064 The question is, how can I close this process of login ?, what I have left open and some one can try to login ? Some notes: I login to the server using tunneling, nothing is open except dns, email, and web ports, not even ftp, and all default ports are change and hidden. I also monitor port scan and capture any one that try to find the hidden ports. Probably it is something open... Thank you in advanced.

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• Fabric and cygwin don't work with windows UNC paths

  - by tcoopman

  I have some strange problems with fabric deployment to Windows Server 2008r2. The thing I try to accomplish is to copy some files to a shared folder with a fabric script (this script does a lot of other things too, but only this step gives me problems). This is the problem: When I try to access a UNC(Universal Naming convention) path I always get access denied kind of answers if I run the script in fabric. When I run the command in an ssh prompt (same user) it works fine. Examples: cmd: robocopy f:/.... //share result: in ssh this works fine, in fabric I get "Logon failure: the user has not been granted the requested logon type aat this computer." cmd: cd //share result: in ssh this works fine, in fabric I get "//share: Not a directory" Further information: uname -a and whoami return exact the same thing in fabric and ssh. I also tried things like mount, net use, but these commands all have kind of the same problem.

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• opennebula 3.4 in debian squeeze

  - by Jin Splif

  hope can get some advise n help.... currently I am installing opennebula 3.4 in debian squeeze everything have being successful where I am able to access the opennebula sunstone webpage localhost:9869 , use one command but when I tried to create a host the status become error... hope someone can assist me on this thanks sample log Monitoring host abc (0) [InM][I]: Command execution fail: 'if [ -x "/var/tmp/one/im/run_probes" ]; then /var/tmp/one/im/run_probes kvm 0 abc; else exit 42; fi' [InM][I]: ssh: Could not resolve hostname abc: Name or service not known [InM][I]: ExitCode: 255 [InM][E]: Error monitoring host 0 : MONITOR FAILURE 0 -

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• Disable disk caches in AWS EBS for PostgreSQL?

  - by Alexandr Kurilin

  It's my understanding that, without correctly disabling OS-level and drive-level caching, there is a chance that in case of system failure the Write-Ahead Log might not be saved correctly and in fact might get corrupted, possibly preventing data recovery. I've already made sure that wal_sync_method=fdatasync however I was unable to make any configuration changes with hdparm since I get the following: $ sudo htparm -I /dev/xvdf /dev/xvdf: HDIO_DRIVE_CMD(identify) failed: Invalid argument Looks like that option is not available in the kind of setup you get in EC2. Am I missing anything here? Are there any other obvious caches I have to disable to ensure the WAL's safety?

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• Using off-the-shelf hardware for brand-name servers; Possible? Good idea?

  - by threecheeseopera

  Is it possible or advisable to use 'regular' not-sanctioned-by-the-server-manufacturer hardware in high end servers? Often these manufacturer-supplied parts have a very high price markup, and I wonder if it's always necessary (understanding that they probably apply more rigorous requirements to this hardware). For example, Dell sells 300GB 15,000rpm serial-attached scsi drives for a certain server family for almost $600 each, while newegg sells a drive with the same specs for almost half the price http://www.newegg.com/Product/Product.aspx?Item=N82E16822116059. Do we really need to pay these high markups, especially for disks that are likely RAID-ed and so guarded against catastrophic failure?

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• Network email alerts

  - by stephenfalken

  I would like to buy or d/l an application that will alert our sysadmin in the event of network failure, like via email and/or phone call. I've looked around the net before posting this question, but I have one main concern: if our network goes down, how can a network monitoring application send email to alert us that it's down? Doesn't this have to be an external application that looks at our network from outside? Well anyway, I want to find something that will handle this for us - freeware if possible, sice we're not looking for heavy analysis - just simple alerts. Advice is appreciated.

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• What tools can be used to monitor a web application? Beyond "doesn't 404"

  - by Freiheit

  I have an internal web application that has recently gone through a major version upgrade. I would like to monitor this application over the weekend and look for 'soft' errors. I will still need to spot check things by hand, but there are some common failure patterns that I think I can automate. Examples include data with bad formatting, blank rows in tables (indicates missing non-critical data), patterns for identifiers ("TEST" means one of my devs left a testing feed on), etc. I think there are applications out there that can be scripted to do things like: 1. log in 2. Go to $URL 3. select 3rd link in $LIST or $PATTERN 4. Check HTML from that link for $PATTERNS 5. Email report Are these goals sane? What applications/tools can help with this?

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• Timeout Error in SQL Server Database Mail Feature

  - by RedLEON

  I configured database mail profile as gmail smtp server, SSL and port 465. I didn't restart server. And this is first time to use Database Mail feature on that server. When I send a testing mail it give me this error message: The mail could not be sent to the recipients because of the mail server failure. (The operation has timed out) I tried this mail configuration with Thunderbird and I could send messages througt this SMTP. Why is SQL Server giving this eror message? I searched here but didn't find any solution.

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• Load balancing without a load balancer?

  - by Tom

  I have 4 nginx-powered image servers on their own subdomains which users would access at random. I decided to put them all behind a HAProxy load balancer to improve the reliability and to see the traffic statistics from a single location. It seemed like a no-brainer. Unfortunately, the move was a complete failure as the load balancer's 100mbit port was completely saturated with all requests now going through it. I was wondering what to do about this - I could get a port upgrade ($$) or return to 4 separate image servers that are randomly accessed. I thought about putting HAProxy on each image server which would in turn route to another image server if that server's nginx service was having trouble. What would you do? I would like to not have to spend too much additional money.

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• Link bonding across multiple switches?

  - by Bryan Agee

  I've read up a little bit on bonding nics with ifenslave; what I'm having trouble understanding is whether there is special configuration needed in order to split the bonds across two switches. For example, if I have several servers that all have two nics each, and two separate switches, do I just configure the bonds and plug 1 nic from each into switch #1 and the other from each into switch #2? or is there more to it than that? If the bonds are active-backup, will a nic failure on single machine mean that server may become disconnected since the rest of the machines are using the primary nic and it's using the secondary? Or do you link the switches with one cable as well?

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• Cannot boot from a hard drive

  - by Martin Melka

  I have a problem booting from a hdd. I used to have it as my main drive before I bought an SSD, so I had been able to boot from it. But for some reason, now, half a year later, I can't get it to work. I completely erased it, deleting data and partitioning (using EASEUS Partition Master), then I installed Kubuntu (without changing anything in the installer), but it simply won't boot up. It always boots the drive with Windows and when I unplug this drive, it only gives me an error "PXE-E61: Media test failure, check cable", I guess it's trying to boot from LAN. I tried installing the system on a freshly deleted drive, without any other drives plugged in the pc, but the problems persist. This is how the drives look now (first one has Windows 7 installed, the second one Kubuntu): I am lost. I mean, after doing a fresh wipe and a clean install without altering anything, it should work. But it doesn't. What can be wrong here? Thanks

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• Backup strategies for linux based file servers

  - by iceman

  I want to know some enterprise-wide backup strategies used for linux based file servers. What are the tools and techniques used when making a backup. for e.g when a backup fails on a machine, it should email the admin about the failure and also a log file. This won't happen incase the HDD fails and the system is completely out of work, but in other cases where a backup didn't take place, the admin should be able to know. What tool/scripts can be used for this particular scenarios?

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• Cannot ssh anymore into FreeBSD 7.2 home server

  - by Gabi

  Somehow sshd stopped running and no amount of start, restart or onestart will make it go again. I normally ssh into it from a dual-boot laptop computer that shows up on the network as gabi-buntu when running Ubuntu Karmic, and as gabi-pc when running Windows XP Pro. Neither my Putty connection nor the Linux terminal can establish a ssh link anymore. Upon rebooting the server, I am greeted with "/etc/rc: WARNING: run_rc_command: cannot run /usr/sbin/sshd". In addition, a message will appear saying things like rpc.statd: failed to contact host gabi-buntu RPC: port mapper failure RPC: timed out Everything else works fine. The FreeBSD 7.2 box runs a print server, a Samba server, and an Apache server for the home wiki, via https. It also serves up NFS shares for Linux clients. Any suggestions? Thank you, Gabi Huiber

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• Why do partially failed/failing switches fail to pass DHCP?

  - by David Mackintosh

  I've noticed this several times: a switch starts to behave oddly. Usually if the switch doesn't fail outright, what tends to get noticed is that DHCP doesn't work. We had a Linksys SRW-224P fail today. Systems which were still connected worked properly, until it came time to renew their DHCP lease. Once the lease expired, they stopped working, but up until then we couldn't detect a failure. This includes PoE VoIP phones -- they work fine until their lease is up, at which point they're done. I've noticed this on the above-mentioned Linksys, three varieties of 3Com, and possibly half a dozen dumb switches. What is it about DHCP that makes it sensitive to failing switches?

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• Home Server restore fails cannot find boot device

  - by Tim Heuer

  I am using Windows Home Server to backup my PCs. I recently had a hard drive failure on one of my WHS connected PCs and obtained an identical sized/speed drive for my laptop. I used the latest home server restore CD and did the restore. It said it completed successfully. Upon reboot, it says 'cannot find boot device' and lists all my drives (hard drive, cd, network book) indicating no valid operating system was found. I boot using the Win7 repair disk and while it doesn't see the operating system, it sees the drive and if I go into a command prompt, I can see all my data on the drive. My laptop is Windows 7 64-bit Ultimate. I've tried most everything I can think of. I'm a technical user (software developer) so I'm pretty aware of how things work (or should). I don't feel like I'm missing a simple step here.

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