ZFS: ZIL device export/import

[mxb]

Yes, will this require some additional interactions.

The big question is WHY export/import works fine for L2ARC device (cache), but not for log (ZIL device) ?

Well, I tried to partition and then label (via glabel) slices on both ZIL and L2ARC, the created a new pool with labels.
Result is the same - L2ARC gets attached upon import, but not ZIL.
GUID reported by 'zdb' is the same for ZIL-partitions on both HU (as well as for L2ARC). The size of cause is the same.

//mxb


On 13 apr 2013, at 19:53, Adam Nowacki <nowakpl at platinum.linux.pl> wrote:

> On 2013-04-13 19:33, mxb wrote:
>> 
>> Hello list,
>> 
>> I'm currently have 2x Head Units (HU) [FreeBSD 9.1] connected to the same JBOD via SAS Expander.
>> Each HU has separate ZIL and L2ARC devices. Hardware on both HU (inc. SSD disks for ZIL/L2ARC) is identical.
>> 
>> This is basically a HA-setup.
>> 
>> The I do an 'zpool export tank' on the first HU and do 'zpool import tank' on the second one, only L2ARC device appears usable.
>> Import fails, complaining about ZIL device not present.
>> 
>> According to the man page zpool(8) ZIL device can be imported and exported.
>> 
>> "… Log devices can be added, replaced, attached, detached, imported and
>>      exported as part of the larger pool. …".
>> 
>> Do I miss something here?
>> This feature not implemented yet?
>> Any way to work around this, except that moving ZIL into JBOD?
> 
> From the same man page:
> -m      Enables import with missing log devices.
> 
> ... but that won't be HA since on unclean shutdown of one the other won't be able to replay the log and some recent writes (or worse) will be lost.
> 
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