* question about --assume-clean
@ 2007-06-09 17:40 Peter Rabbitson
2007-06-09 22:31 ` Neil Brown
0 siblings, 1 reply; 2+ messages in thread
From: Peter Rabbitson @ 2007-06-09 17:40 UTC (permalink / raw)
To: linux-raid
Hi,
I am about to create a large raid10 array, and I know for a fact that
all the components are identical (dd if=/dev/zero of=/dev/sdXY). Is it
safe to pass --assume-clean and spare 6 hours of reconstruction, or are
there some hidden dangers in doing so?
Thanks
Peter
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: question about --assume-clean
2007-06-09 17:40 question about --assume-clean Peter Rabbitson
@ 2007-06-09 22:31 ` Neil Brown
0 siblings, 0 replies; 2+ messages in thread
From: Neil Brown @ 2007-06-09 22:31 UTC (permalink / raw)
To: Peter Rabbitson; +Cc: linux-raid
On Saturday June 9, rabbit@rabbit.us wrote:
> Hi,
>
> I am about to create a large raid10 array, and I know for a fact that
> all the components are identical (dd if=/dev/zero of=/dev/sdXY). Is it
> safe to pass --assume-clean and spare 6 hours of reconstruction, or are
> there some hidden dangers in doing so?
No, there are no hidden dangers.
--assume-clean is generally quite safe with mirroring levels (raid1,
raid10). The only issue is that if you do a regular 'check', then it
will reports lots of issues. If do a 'repair' it will fix the issues.
With raid4/5/6, --assume-clean is *not* safe if there is any doubt that
the drive are not already in an in-sync state.
NeilBrown
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2007-06-09 17:40 question about --assume-clean Peter Rabbitson
2007-06-09 22:31 ` Neil Brown
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