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  1. #1

    OpenVZ VPS Node Read-Only Issue - Help Please!

    Hey everyone!
    I just started a new account here to see if anyone could help me with a problem I am having.

    I have an OpenVZ VPS node with around 50 users on it, but the damn thing keeps going into read-only mode every few days and I have NO idea why this would happen. I have requested sys-admins and other techs to take a look and no one seems to know the issue. This is my hardware setup --

    Intel Xeon E3-1230v2
    32GB of RAM
    RAID10 (8 x 240GB Intel 520)
    LSI RAID BBU 9266
    CentOS 6 64-bit (Originally installed)

    It is running the latest OpenVZ Kernel so I have no idea why the panel keeps going into read-only. The RAID card has been replaced once and all the drives tested out healthy. All hardware and software are updated to the latest drivers and firmware as well.

    Does anyone have any ideas or experiences with the a similar issue? The load is low and everything is fast as hell, but this is killing the stability I was hoping for.
    Last edited by GenBBQ; 01-24-2014 at 08:54 AM.

  2. #2
    Join Date
    Sep 2000
    New Jersey
    What you first need to do is get a better idea why its going read only. Check dmesg for an error: is it a file system error (possibly correctable with fsck) or some type of hardware error?

    Next check the hardware. At minumum verify with smartcheck all the drives are in good health, and have no bad (uncorrectable/pending sectors).

    If smartcheck checks out and it is a file system error, then an FSCK may just needed. Otherwise you need a more involved hardware test. I have seen read only errors from anything from bad power supply to RAM. A memtest can clear ram issues, and your DC should have a simple power supply tester.

    If ram and the PSU pass, then you'll need to swap the hardware like the raid card, motherboard and/or CPU.
    John Quaglieri - InterServer, Inc

  3. #3
    Join Date
    Dec 2005
    First step is to identify whether its the hardware i.e. controller timing out/going offline or a filesystem issue.

    When it does go RO can you remount, if not what is the error?

  4. #4
    Join Date
    Dec 2012
    Yeah, in the past we have found RO issues tend to usually be random hardware related problems. Start with the simple thing, smart checks on the drives, memtest on the memory, replace the power supply, you can rule out the raid card since its very unlikely 2 cards are bad for you, then check to make sure your raid card is up to date with the latest firmware/bios as well as your MB. And lastly if you still have the issue swap the MOBO and CPU.
    SolaDrive - Enterprise Managed Solutions
    Specializing in Managed SSD VPS & Dedicated Servers in US & UK
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  5. #5
    Thank you for the prompt replies everyone. I'll try to get more information the next time it happens as I am expecting it soon.

    Can the PSU also cause random server reboots and kernel panics as well?

  6. #6
    Server went into R/O again and this is the dmesg:

    [27245.048834] sd 0:2:0:0: rejecting I/O to offline device
    [27245.049082] sd 0:2:0:0: rejecting I/O to offline device
    [27245.049520] sd 0:2:0:0: rejecting I/O to offline device
    [27245.049763] sd 0:2:0:0: rejecting I/O to offline device
    [27245.050117] sd 0:2:0:0: rejecting I/O to offline device
    [27245.050342] EXT3-fs error (device sda4): ext3_get_inode_loc: unable to read inode block - inode=47802299, block=191201405

    Any ideas? Did a hardware check on each of the SSDs (all 8) and it came out healthy.

    We also replaced PSU, mobo, CPU, RAM and raid-card as well.

    Would it be possible a user is causing this on the box?

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