On 30/08/2013 13.45, Ronald Klop wrote:
On Fri, 30 Aug 2013 12:58:29 +0200, Johan Hendriks
<joh.hendr...@gmail.com> wrote:
Maurizio Vairani wrote:
On 29/08/2013 11.01, Andriy Gapon wrote:
on 29/08/2013 11:27 Maurizio Vairani said the following:
I am able to boot the PC without a cache device but not without a
log device. Why ?
The log could potentially contain uncommitted entries. Without the
log device
there is no knowing if it did or did not. And if it did then the
pool is
inconsistent state without the log device and so it can not be
imported.
The cache is not persistent and so there is nothing needed from it
upon a boot.
Thank you for the clear and concise reply.
Yesterday I have done some test. If I remove the stick from the USB
port, before the shutdown the PC, it don't crash but continues to
works. Then I am able to reboot the laptop without inserting the
stick with a pool that works in degraded mode.
From the end user point of view a PC should always boot, even with a
missing ZFS log device.
Regards
Maurizio
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I do not agree with the following.
From the end user point of view a PC should always boot, even
with a missing ZFS log device.
I think it should give you a option to import the pool or not import
the pool!
No problem I agree, a step in the right direction.
There could be a situation when you are not sure that the ZIL is
commited, in that situation it would be handy if you can suspend the
boot and make sure the ZIL is there when you reboot or import after
you attached the ZIL.
I would hate it when it corrups my data just because we always
import. with or without the ZIL.
In your test you remove the ZIL, and when you reboot then it imports
correctly, as far as my knowledge goes this is ok, because when the
pool is exported there is no left data in the ZIL, it was not there
when we exported, so we can import even without the missing ZIL
without problem.
I think he was just lucky his system wasn't writing a lot to the ZIL
at the moment of removal. So his system was in a consistent state.
Otherwise you just miss data which is in the ZIL and not on disk.
I have removed the stick when there isn't R/W to the disk.
BTW: Not everything goes through the ZIL. It is not the same as a
journal. Only sync writes go to the ZIL. If you don't use databases or
NFS or other software which wants to make sure data is on stable
storage, you might rarely use the ZIL.
Thanks for the explanation.
Ronald.
regards
Johan
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Regards
Maurizio
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