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* [linux-lvm] lvm metadata sequence number reverts
@ 2015-09-15 21:18 Aaron Young
  2015-09-16  8:11 ` Zdenek Kabelac
  0 siblings, 1 reply; 4+ messages in thread
From: Aaron Young @ 2015-09-15 21:18 UTC (permalink / raw)
  To: linux-lvm

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Hello, I'm deep into debugging an issue we have with a disk driver of ours
and LVM.

Long story short:

create vg -> seqno 1
create lv1 -> seqno 2
create lv2 -> seqno 3
create lv3 -> seqno 4
create lv4 -> seqno 5
<clear our device cache> (note, this generates no IO)
vgdisplay: seqno = 4, lv4 is missing

* This happens only after dozens to hundreds of iterations. Most of the
time it is fine.

I dd all the metadata blocks off of the pv, yep, seqno5 is on disk metadata
area perfectly fine. But the system believes 4 is the current version.
Shouldn't the system be using the highest value? Or is it stored somewhere?
What mechanism is responsible for changing the seqno? And where does it
change it? (Not the metadata contents, just the number)

Thanks,

Aaron

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^ permalink raw reply	[flat|nested] 4+ messages in thread

end of thread, other threads:[~2015-09-17 15:39 UTC | newest]

Thread overview: 4+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2015-09-15 21:18 [linux-lvm] lvm metadata sequence number reverts Aaron Young
2015-09-16  8:11 ` Zdenek Kabelac
2015-09-16 22:31   ` Aaron Young
2015-09-17 15:39     ` Aaron Young

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