Hello
Bad news, to day two servers with applayed patches get L2ARC degraded
L2 ARC Summary: (DEGRADED)
Passed Headroom: 4.17m
Tried Lock Failures: 635.53m
IO In Progress: 41.89k
Low Memory Aborts: 8
Free on Write: 1.03m
Writes While Full: 12.95k
R/W Clashes: 405.05k
Bad Checksums: 362.19k
IO Errors: 45.60k
SPA Mismatch: 526.37m
L2 ARC Size: (Adaptive) 391.03 GiB
Header Size: 0.59% 2.30 GiB
So looks like problem not disapered ^(
Vitalij Satanivskij wrote:
VS>
VS> First of all Thank you for help.
VS>
VS> As for high load on system, looks like problems with l2arc have litle
impact on load comparatively to another just now
VS>
VS> not fully classifed things.
VS>
VS> Looks like ower internal software and libs that it use didn't like new VMEM
subsystem, at last
VS> system behavior complitely diferent from 6 month older CURRENT.
VS>
VS> So for now none problem's with l2arc errors.
VS>
VS> Will try to understand reason of load and fix or at last ask for help again
^).
VS>
VS>
VS>
VS>
VS> Steven Hartland wrote:
VS> SH> First off I just wanted to clarify that you don't need to compression on
VS> SH> dataset for L2ARC to use LZ4 compression, it does this by default as is
VS> SH> not currently configurable.
VS> SH>
VS> SH> Next up I believe we've found the cause of this high load and I've just
VS> SH> committed the fix to head:
VS> SH> http://svnweb.freebsd.org/base?view=revision&sortby=file&revision=256889
VS> SH>
VS> SH> Thanks to Vitalij for testing :)
VS> SH>
VS> SH> Dmitriy if you could test on your side too that would be appreciated.
VS> SH>
VS> SH> Regards
VS> SH> Steve
VS> SH>
VS> SH> ----- Original Message -----
VS> SH> From: "Vitalij Satanivskij" <sa...@ukr.net>
VS> SH> To: "Allan Jude" <free...@allanjude.com>
VS> SH> Cc: <freebsd-current@freebsd.org>
VS> SH> Sent: Thursday, October 10, 2013 6:03 PM
VS> SH> Subject: Re: ZFS L2ARC - incorrect size and abnormal system load on
r255173
VS> SH>
VS> SH>
VS> SH> > AJ> Some background on L2ARC compression for you:
VS> SH> > AJ>
VS> SH> > AJ> http://wiki.illumos.org/display/illumos/L2ARC+Compression
VS> SH> >
VS> SH> > I'm alredy see it.
VS> SH> >
VS> SH> >
VS> SH> >
VS> SH> > AJ> http://svnweb.freebsd.org/base?view=revision&revision=251478
VS> SH> > AJ>
VS> SH> > AJ> Are you sure that compression on pool/zfs is off? it would
normally
VS> SH> > AJ> inherit from the parent, so double check with: zfs get
compression pool/zfs
VS> SH> >
VS> SH> > Yes, compression turned off on pool/zfs, it's was may time rechecked.
VS> SH> >
VS> SH> >
VS> SH> >
VS> SH> > AJ> Is the data on pool/zfs related to the data on the root pool? if
VS> SH> > AJ> pool/zfs were a clone, and the data is actually used in both
places, the
VS> SH> > AJ> newer 'single copy ARC' feature may come in to play:
VS> SH> > AJ> https://www.illumos.org/issues/3145
VS> SH> >
VS> SH> > No, both pool and pool/zfs have diferent type of data, pool/zfs was
created as new empty zfs (zfs create pool/zfs)
VS> SH> >
VS> SH> > and data was writed to it from another server.
VS> SH> >
VS> SH> >
VS> SH> > Right now one machine work fine with l2arc. This machine without
patch for corecting ashift on cache devices.
VS> SH> >
VS> SH> > At last 3 day's working with zero errors. Another servers with same
config similar data, load and so on after 2 day
VS> SH> > work began report abouy errors.
VS> SH> >
VS> SH> >
VS> SH> > AJ>
VS> SH> > AJ>
VS> SH> > AJ>
VS> SH> > AJ> --
VS> SH> > AJ> Allan Jude
VS> SH> > AJ>
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