Unrecognized error on zfs v28

[Bob Friesenhahn]

On Sat, 21 Jan 2012, Vladislav V. Prodan wrote:

> zpool scrub zroot did not help.
> How to deal with such errors?

A recommendation for how to deal with the problem was provided in the 
zpool status "action" text.  If you don't have a backup for the file, 
then an alternative is to just delete it and hope that you did not 
really need it.

Your pool/filessytem does not include any data redundancy so it is not 
able to repair bad data.

If you had set the zfs filesystem attribute 'copies=2' then zfs would 
likely have been able to recover this data, even though you only have 
one disk, but more disk space would have been consumed.

Bob

>
> # zpool upgrade zroot
> This system is currently running ZFS pool version 28.
>
>
> # zpool status -v zroot
>  pool: zroot
> state: ONLINE
> status: One or more devices has experienced an error resulting in data
>        corruption.  Applications may be affected.
> action: Restore the file in question if possible.  Otherwise restore the
>        entire pool from backup.
>   see: http://www.sun.com/msg/ZFS-8000-8A
> scan: scrub repaired 0 in 1h54m with 0 errors on Sat Jan 21 00:37:16 2012
> config:
>
>        NAME               STATE     READ WRITE CKSUM
>        zroot              ONLINE       0     0     0
>          gpt/disk-system  ONLINE       0     0     0
>
> errors: Permanent errors have been detected in the following files:
>
>        /var/imap/vlad11/&BBEEOwQ+BDM-@&BB4EQgRABDAENAQw-
>
> # uname -a
> FreeBSD mary-teresa.XXX 8.2-STABLE FreeBSD 8.2-STABLE #0: Wed Jul 13
> 02:01:02 EEST 2011     root at mary-teresa.XXX:/usr/obj/usr/src/sys/XXX.4
> amd64
>
> # zfs get all zroot/var/imap
> NAME            PROPERTY              VALUE                 SOURCE
> zroot/var/imap  type                  filesystem            -
> zroot/var/imap  creation              вс май  1  2:40 2011  -
> zroot/var/imap  used                  272M                  -
> zroot/var/imap  available             400G                  -
> zroot/var/imap  referenced            206M                  -
> zroot/var/imap  compressratio         2.23x                 -
> zroot/var/imap  mounted               yes                   -
> zroot/var/imap  quota                 none                  default
> zroot/var/imap  reservation           none                  default
> zroot/var/imap  recordsize            128K                  default
> zroot/var/imap  mountpoint            /var/imap             inherited
> from zroot/var
> zroot/var/imap  sharenfs              off                   default
> zroot/var/imap  checksum              fletcher4             inherited
> from zroot
> zroot/var/imap  compression           gzip                  local
> zroot/var/imap  atime                 on                    default
> zroot/var/imap  devices               on                    default
> zroot/var/imap  exec                  off                   local
> zroot/var/imap  setuid                off                   local
> zroot/var/imap  readonly              off                   default
> zroot/var/imap  jailed                off                   default
> zroot/var/imap  snapdir               hidden                default
> zroot/var/imap  aclinherit            restricted            default
> zroot/var/imap  canmount              on                    default
> zroot/var/imap  xattr                 off                   temporary
> zroot/var/imap  copies                1                     default
> zroot/var/imap  version               5                     -
> zroot/var/imap  utf8only              off                   -
> zroot/var/imap  normalization         none                  -
> zroot/var/imap  casesensitivity       sensitive             -
> zroot/var/imap  vscan                 off                   default
> zroot/var/imap  nbmand                off                   default
> zroot/var/imap  sharesmb              off                   default
> zroot/var/imap  refquota              none                  default
> zroot/var/imap  refreservation        none                  default
> zroot/var/imap  primarycache          all                   default
> zroot/var/imap  secondarycache        all                   default
> zroot/var/imap  usedbysnapshots       66,2M                 -
> zroot/var/imap  usedbydataset         206M                  -
> zroot/var/imap  usedbychildren        0                     -
> zroot/var/imap  usedbyrefreservation  0                     -
> zroot/var/imap  logbias               latency               default
> zroot/var/imap  dedup                 off                   inherited
> from zroot
> zroot/var/imap  mlslabel                                    -
> zroot/var/imap  sync                  standard              default
> zroot/var/imap  refcompressratio      2.21x                 -
>
>

-- 
Bob Friesenhahn
bfriesen at simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer,    http://www.GraphicsMagick.org/