An incident on 2012-11-24 around 23:57: multiple problems where hardware is imperfect – storage for a sparse bundle disk image is not mounted whilst Time Machine attempts writes to that image
A visual overview of that point in time:

Critically: whilst Time Machine tried to work with an attached sparse bundle disk image, the ZFS file system where that image was stored was no longer mounted.
Other points of interest:
- a crash of zfs, unsurprising given the situation
- following a forced restart of the computer, another unexpected split of the LaCie – instead of one ~500 GB device, the operating system found two ~250 GB devices
- disconnection from FireWire was followed by USB connection and recognition of one larger device.
The 500 GB LaCie Big Disk Extreme (300794EK) and/or its power supply is known to be problematic so I don't seek help, but I set aside a collection of logs.
Considering the most recent output from Terminal (below) I doubt that an import with force will succeed. But I'll try. If I can't force things with zpool then I might try an undocumented feature of zdb.
My aim is to get history with zdb then abandon the hardware (but not throw it away – it's useful for test cases such as this).
- Code: Select all
bash-3.2$ sudo zpool import
pool: winterLaCieBDE
id: 7505624727452478219
state: FAULTED
status: One or more devices contains corrupted data.
action: The pool cannot be imported due to damaged devices or data.
The pool may be active on another system, but can be imported using
the '-f' flag.
config:
winterLaCieBDE FAULTED corrupted data
GPTE_EBE84E4F-017F-4D9A-898E-45AA635579E3 UNAVAIL corrupted data
bash-3.2$ clear
bash-3.2$ sudo gpt -r show /dev/disk2
start size index contents
0 1 PMBR
1 1 Pri GPT header
2 32 Pri GPT table
34 6
40 409600 1 GPT part - C12A7328-F81F-11D2-BA4B-00A0C93EC93B
409640 976122400 2 GPT part - 6A898CC3-1DD2-11B2-99A6-080020736631
976532040 262072
bash-3.2$ sudo zdb -hvvvvv winterLaCieBDE > ~/Desktop/zdb.txt
zdb: can't open 'winterLaCieBDE': Device not configured
bash-3.2$ zpool list
NAME SIZE ALLOC FREE CAP HEALTH ALTROOT
gjp22 572Gi 406Gi 166Gi 71% ONLINE -
bash-3.2$ zpool status
pool: gjp22
state: ONLINE
scan: scrub repaired 0 in 13h7m with 0 errors on Mon Nov 19 23:08:04 2012
config:
NAME STATE READ WRITE CKSUM
gjp22 ONLINE 0 0 0
GPTE_71B8BDA2-3EBA-4B91-9E1C-2AE2B1DAAD06 ONLINE 0 0 0 at disk9s2
errors: No known data errors
bash-3.2$ sudo zpool import -f 7505624727452478219
cannot import 'winterLaCieBDE': one or more devices is currently unavailable
bash-3.2$ exit
exit
macbookpro08-centrim:~ hello$ exit
logout
[Process completed]