I have noticed the suggestions here from experienced people who,
time and again, repeat the wisdom suggesting use of RAID mirrors
(using Apple's Software RAID built into Mac OS X Server,
particularly 10.4.x Server), and the "split mirror" approach to
taking snapshots of quiescent filesystems (using asr).
What if the quiescent filesystem (such as an HFSX journaled
formatted filesystem) is corrupted or has some sort of filesystem
error on it (unbeknown to the system administrator that is the
custodian of this filesystem) -- for example,
Then you have a copy of the corrupted filesystem. This is no
different than with any other backup methodologies.
/However/, given that you have the filesystem offline to play with
you could easily verify or repair it /before/ the backup and mitigate
this issue.
This should all have gone w/o saying from common sense.
what if the the filesystem crashed due to a kernel error or maybe a
freak accident such as a UPS failing during a power disruption
(causing the power to fail and for an ungraceful shutdown to take
place).
Then it wouldn't have been available to have been split off.
In such a situation, it may not be discoverable until days or weeks
later that the filesystem being snapshotted in a quiescent manner is
corrupted.
No. See above.
So, we end up with an asr snapshot clone of this filesystem and
later on we desire to restore this clone. I understand that the
clone restoration using asr should choose to erase the target volume
being restored to, but I am wondering if the corrupted bits of the
snapshot will also be cloned to the target volume (and thus the
corruption could be propagated to the target volume)?
No. See above.
Furthermore, what is the recommended best practice to detect if the
state of an HFSX journaled filesystem is not corrupted and thus
worthy of snapshotting?
:incredulous look:
verify the filesystem using fsck, et cetera.
--
-dhan
------------------------------------------------------------------------
Dan Shoop AIM: iWiring
Systems & Networks Architect http://www.ustsvs.com/
email@hidden http://www.iwiring.net/
1-714-363-1174
"The wise man doesn't give the right answers, he poses the right
questions." -- Claude Levi-Strauss
iWiring provides systems and networks support for Mac OS X, unix, and
Open Source application technologies at affordable rates.
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