[dm-devel] ALUA - rescan device capacity on zero sized block devices
Hannes Reinecke
hare at suse.de
Mon Apr 20 05:58:24 UTC 2015
On 04/19/2015 12:56 AM, Christophe Varoqui wrote:
> About five years ago, we faced a somewhat simular issue with
> Symmetrix arrays, where the replicated LU of a SRDF pair (R2) was
> flagged read-only by the kernel upon discovery. Splitting the pair
> with a symcli command made the LU read-write from the array
> controller point of view, but the Linux kernel would not promote it
> read-write dynamically.
>
> I don't know if the Symmetrix array also use a unit attention to
> signal the change to the initiators. If it does, it might be worth
> trying to address both the 3par peer persistance and the Symmetrix
> SRDF situations.
>
> On the other hand, if the SRDF R2 rw promotion issue has been fixed
> since, the patch might give guidance about where/how to plug the
> 3par peer persistance ghost path rescans.
>
It's not only that; if you are faced with LUNs in standby even the
kernel wouldn't detect them properly.
I'm currently debugging this issue and will have an update soon(-ish).
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
hare at suse.de +49 911 74053 688
SUSE LINUX GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: F. Imendörffer, J. Smithard, J. Guild, D. Upmanyu, G. Norton
HRB 21284 (AG Nürnberg)
More information about the dm-devel
mailing list