I wondered what would happen in response to a
zpool offline …
command.
As far as I recall, the command was rejected – "insufficient replicas" or words to that effect. All OK so far.
Later, probably following a restart of OS X 10.8.2, I used the shift key at login time. Result:
- no trace of the pool or the 500 GB disk
- two 250 GB disks found by the operating system (I declined the invitation to initialise them).
ZFS aside: a comparable split occurred years ago (see How to break away from LaCie Big Disk Extreme firmware, for its two disks to appear as two instead of one? and my devices with known imperfections or suspected issues).
So I welcomed today's opportunity to experiment ruthlessly with the two 250 GB disks.
Highlights:
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/dev/disk4
#: TYPE NAME SIZE IDENTIFIER
0: GUID_partition_scheme *250.1 GB disk4
1: EFI 209.7 MB disk4s1
/dev/disk5
#: TYPE NAME SIZE IDENTIFIER
0: *250.1 GB disk5
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macbookpro08-centrim:~ gjp22$ sudo zpool create -o ashift=12 splitlaciebde mirror /dev/disk4 dev/disk5
Password:
cannot open 'dev/disk5': no such device in /dev/dsk
must be a full path or shorthand device name
After disconnecting then reconnecting, the hardware and firmware were back to normal (a single 500 GB disk). However:
- Code: Select all
macbookpro08-centrim:~ gjp22$ sudo zpool import
pool: flakylaciebde
id: 9774159268332657427
state: UNAVAIL
status: One or more devices contains corrupted data.
action: The pool cannot be imported due to damaged devices or data.
config:
flakylaciebde UNAVAIL insufficient replicas
GPTE_5C86D4B6-C273-46EB-8176-5DD968AE035A UNAVAIL corrupted data
Reportedly insufficient replicas but there never was a replica.
Terminal output, screen recording and other files at http://www.wuala.com/grahamperrin/publi ... de=gallery
Also in the mix, at the tail of the FireWire 800 bus, an old LaCie 1 TB Big Disk Extreme (300797EK) that's sometimes unknown (in System Information) until after I switch off then on. Maybe an issue with an external power supply.
I don't expect any answers or conclusions, but it's thought-provoking!