ZFS L2ARC checksum errors after compression

Lev Serebryakov lev at FreeBSD.org
Sat Oct 29 11:36:34 UTC 2016

Hello freebsd-fs,

 System is FreeBSD 10.3-STABLE #0 r307523: Mon Oct 17 22:36:27 MSK 2016.

 I have a small L2ARC (185G) on SSD for my RAIDZ1 pool.

 When "ALLOC" on this L2ARC becomes greater than "SIZE" (it is compression
 works, am I right?), zfs-stats shows, that number of checkum errors start
 to raise. For example, I have this "zfs-stats -L" output now:

 L2 ARC Summary: (DEGRADED)
        Passed Headroom:                        153.46k
        Tried Lock Failures:                    9.65k
        IO In Progress:                         4.33k
        Low Memory Aborts:                      9
        Free on Write:                          1.77k
        Writes While Full:                      15.20k
        R/W Clashes:                            0
        Bad Checksums:                          104.95k
        IO Errors:                              0
        SPA Mismatch:                           4.10m

 And "Bad Checksums" goes up rather fast, it becomes 105.31k when I compose
 this message!

  Looks like here is some problems with L2ARC compression.

Best regards,
 Lev                          mailto:lev at FreeBSD.org
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