I used a usb stick, and the first time I used it, I used something similar to
zpool create black c5t0d0p0 # ie with the "p0" pseudo partition
and used it happily for some while.
Some weeks later, I wanted to use the stick again, starting afresh, but this
time used
zpool create black c5t0d0 # ie *without* the "p0" pseudo partition
and later, when attempting to import it, I got offered *both* the black pools,
the original (ie old and overwritten) one from c5t0d0p0, and the newer good one
from c5t0d0
Should zfs protect against this "user error"? (I'm not even sure why it
occurred, since I had assumed that both pseudo devices would map to a similar
region)
# uname -a
SunOS mouse 5.11 snv_77 i86pc i386 i86pc
#
# rmformat
Looking for devices...
1. Logical Node: /dev/rdsk/c5t0d0p0
Physical Node: /[EMAIL PROTECTED],0/pci1043,[EMAIL PROTECTED],1/[EMAIL
PROTECTED]/[EMAIL PROTECTED],0
Connected Device: SanDisk U3 Cruzer Micro 3.27
Device Type: Removable
Bus: USB
Size: 3.9 GB
Label: <Unknown>
Access permissions: Medium is not write protected.
# zpool import
pool: black
id: 13810954658225353291
state: ONLINE
status: The pool is formatted using an older on-disk version.
action: The pool can be imported using its name or numeric identifier, though
some features will not be available without an explicit 'zpool upgrade'.
config:
black ONLINE
c5t0d0 ONLINE
pool: black
id: 4667414672969078773
state: ONLINE
status: The pool was last accessed by another system.
action: The pool can be imported using its name or numeric identifier and
the '-f' flag.
see: http://www.sun.com/msg/ZFS-8000-EY
config:
black ONLINE
c5t0d0p0 ONLINE
### first the newer (ie) good one is imported and used ok
# zpool import 13810954658225353291
# ls /black
November
# zpool status black
pool: black
state: ONLINE
status: The pool is formatted using an older on-disk format. The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'. Once this is done, the
pool will no longer be accessible on older software versions.
scrub: none requested
config:
NAME STATE READ WRITE CKSUM
black ONLINE 0 0 0
c5t0d0 ONLINE 0 0 0
errors: No known data errors
#
# find black -depth -print | cpio -pmd /var/tmp
788016 blocks
# zpool scrub black
# zpool status black
pool: black
state: ONLINE
status: The pool is formatted using an older on-disk format. The pool can
still be used, but some features are unavailable.
action: Upgrade the pool using 'zpool upgrade'. Once this is done, the
pool will no longer be accessible on older software versions.
scrub: scrub completed with 0 errors on Thu Nov 29 12:51:08 2007
config:
NAME STATE READ WRITE CKSUM
black ONLINE 0 0 0
c5t0d0 ONLINE 0 0 0
errors: No known data errors
#
#
## ...and now the older one that's most likely corrupt is used...
# zpool export black
# zpool import -f 4667414672969078773
# ls /black
October
#
# zpool scrub black
...some time passes...
# zpool status black
pool: black
state: DEGRADED
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
scrub: scrub completed with 7224 errors on Thu Nov 29 12:56:47 2007
config:
NAME STATE READ WRITE CKSUM
black DEGRADED 0 0 26.6K
c5t0d0p0 DEGRADED 0 0 26.6K too many errors
errors: 7073 data errors, use '-v' for a list
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