[linux-lvm] LVM hangs
zkabelac at redhat.com
Mon Nov 13 21:56:35 UTC 2017
Dne 13.11.2017 v 18:41 Gionatan Danti napsal(a):
> On 13/11/2017 16:20, Zdenek Kabelac wrote:
>>> Are you talking about RH bug 1388632?
>>> Unfortunately I can only view the google-cached version of the bugzilla
>>> page, since the bug is restricted to internal view only.
>> that could be similar issue yes
>>> But the google-cached version suggests that the bug is mainly hit when
>>> removing the raid-backed cache pool under IO.
>>> I my scenario, no modification (like cache removal) of the lvm setup was
>>> done when the blocks occured.
>> Easiest is to check 'dmsetup status' - just to exclude if it's frozen raid
> Hi Zdeneck,
> due to how easy is to trigger the bug, it seems a very serious problem to me.
> As the bug report is for internal use only, can you shed some light on what
> causes it and how to avoid?
> Specifically can you confirm that, if using an "old-school" mdadm RAID device,
> the bug does not apply?
IMHO this particular issue is probably not triggerable (at least not so
easily) by mdadm.
lvm2 has some sort of problem compared to mdadm - it's able to 'generate' more
device state changes per second then mdadm.
BZ is still being examined AFAIK....
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