Hi David, (and everyone else!)
First of all I enjoyed your presentation, and my first TriLUG meeting.
So 'thanks' to all involved!
My question was with regards the meaning of RAID0 being dirty. The md(4)
manpage refers to just about everything except RAID0 which makes me
think it was left off the list for a reason.
From what I understand, arrays are marked as dirty when a write
requires writes to multiple devices and not all writes have yet
completed. Is there a reason then why a RAID0 would always be dirty?
(Other than because of the types of files stored there :P)
Hopefully soon some of my proposed purchases will be approved and I'll
sleep a little better at night knowing that there's no more RAID0
around. But until then... *sigh*
Rich
David W. Aquilina wrote:
reetings all,
Hope everyone enjoyed the presentation. The slides are available at http://www.trilug.org/~dwa/md-lvm-presentation.
Regarding the question of what a 'dirty' array means, the following is from the md(4) manpage:
UNCLEAN SHUTDOWN
When changes are made to a RAID1, RAID4, RAID5 or RAID6 array there is
a possibility of inconsistency for short periods of time as each
update requires are least two block to be written to different
devices, and these writes probably wont happen at exactly the same
time. Thus if a system with one of these arrays is shutdown in the
middle of a write operation (e.g. due to power failure), the array may
not be consistent.
<snip>
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