Re: Repeatable, raid1+O_DIRECT, hang/warn

Dne 14. 06. 26 v 19:57 Dr. David Alan Gilbert napsal(a):
> Hi,
>    I've got a repeatable raid hang/warn and would appreciate some pointers
> as where to debug.
>    (I've been logging stuff on  https://bugzilla.kernel.org/show_bug.cgi?id=221535 )
> 
>    This started off as debugging a case where I'd get my RAID1 (on the host)
> getting a reliable 'rescheduling sector'/disk failure while running the qemu block test suite
> during a qemu build, but then I tried to build a smaller discrete
> test, and now I've got a simply triggerable warn and test hang.
> There's no errors from the underlying SATA layer on the storage,
> everything resyncs just fine.
> 
> I've got an existing LVM vg ('main') with two mirrors on sda2, and sdb2
> which are SATA disks.
> 
> # lvcreate --type mirror --mirrors 1 -L 1G main /dev/sda2 /dev/sdb2
>

Hi

It's probably worth to say here - the '--type mirror' is the OLD (historical) 
DM mirror target implementation - this target is now in the not so active 
development as users are supposed to be using newer (and faster) md wrapped 
'--type raid1'

So if you use   'lvcreate -m1 ....'   you get 'auto-magically' this mirroring 
target.

But this obviously doesn't fix the problem if old mirror target...

Regards

Zdenek