# [OmniOS-discuss] [discuss] crash dump speed painfully slow

Richard Elling richard.elling at richardelling.com
Wed Nov 5 21:16:29 UTC 2014

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    On Nov 5, 2014, at 12:42 PM, Schweiss, Chip via illumos-discuss <discuss at lists.illumos.org> wrote:

    >
    > On Wed, Nov 5, 2014 at 2:36 PM, Dan McDonald <danmcd at omniti.com> wrote:
    >
    > > On Nov 5, 2014, at 3:31 PM, Schweiss, Chip via illumos-discuss <discuss at lists.illumos.org> wrote:
    > >
    > > I had a system crash this morning when I/O on a pool was hung with failmode=panic.
    >
    > What version of OmniOS are you running?
    >
    > r1510010
    >
    >
    > > That was 7 1/2 hours ago and it's at 64%.    I'm going to let it complete so the failure can be analyzed more, but I really need to find a way to significantly speed up the crash dumps.
    > >
    > > This system has 256GB ram and a dedicated dump pool of two 320GB mirrored SATA disks.
    > >
    > > I'm aware of the multi-threaded dump issue so I have these to lines in /etc/system
    > >
    > > set dump_plat_mincpu=0
    >
    > That should be the default now.  I can't remember which rev of OmniOS it showed up in, but certainly it's in 010 or later.
    >
    > > It's not clear where the bottleneck is.  I don't think it's the disk.  The disk activity lights are a light flicker, by no means being hit hard.  Unless it's a serial latency issue.
    > >
    > > What would be my best approach to get good dumps from a system like this in minutes, not hours?   Assuming that is possible.
    >
    > You weren't dumping to the same pool or the same controller where you had the I/O hang, were you?
    >
    > No, I setup a dedicated dump pool to a pair of mirrored SATA disks connected to the motherboard AHCI controller.

    Try dumping to a raw slice instead of ZFS.
     -- richard

    >
    > -Chip
    >
    > Dan
    >
    >
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