[dm-devel] [PATCH 0/2] multipath-tools: add more ALUA info to docs

[Xose Vazquez Perez]

On 3/26/21 5:36 PM, Martin Wilck wrote:

> On Thu, 2021-03-25 at 23:34 +0100, Xose Vazquez Perez wrote:
>> Xose Vazquez Perez (2):
>>    multipath-tools: add info about how to enable ALUA in Huawei
>> OceanStor arrays
>>    multipath-tools: add more info about ALUA for CLARiiON arrays
>>
>>   README.alua | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> Cc: Martin Wilck <mwilck at suse.com>
>> Cc: Benjamin Marzinski <bmarzins at redhat.com>
>> Cc: Christophe Varoqui <christophe.varoqui at opensvc.com>
>> Cc: DM-DEVEL ML <dm-devel at redhat.com>
>> Signed-off-by: Xose Vazquez Perez <xose.vazquez at gmail.com>
> 
> Reviewed-by: Martin Wilck <mwilck at suse.com>
> 
>> ---
>> BTW, some "new" generations of fully symmetrical Active-Active arrays
>> support ALUA
>> (by default ???), but in the multipath-tools hwtable they are defined
>> as "multibus":

[moved]

> Almost every (SCSI) array I've seen lately supports ALUA (even though
> some seem to interpret the standard quite freely).

Hitachi VSP is an exception.

> In general, we rely on the vendors for these matters. But if you have
> reliable information, I support changing this to "group_by_prio".

>> - IBM DS8000, since ???

For DS8000 there are no official docs. However
IBM/2107900 was added to the kernel with the alua handler in 2008:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=057ea7c9683c3d684128cced796f03c179ecf1c2
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/scsi/device_handler/scsi_dh_alua.c?id=057ea7c9683c3d684128cced796f03c179ecf1c2#n683

And a pair of recent logs:
https://marc.info/?l=linux-scsi&m=156407413807511
https://marc.info/?l=linux-scsi&m=155074069424506&q=mbox

>> - IBM XIV, since Gen2 with microcode 10.2.1

https://www.ibm.com/support/pages/ibm-flashsystem%C2%AE-a9000-and-a9000r-hyperswap-solution-deployment-linux%C2%AE-ibm-z-systems%C2%AE
https://www.redbooks.ibm.com/redbooks/pdfs/sg248368.pdf (page 186 [172])

>> - EMC SYMMETRIX, since VMAX 3 with HYPERMAX OS 5977.811.784

https://www.delltechnologies.com/zh-tw/collaterals/unauth/technical-guides-support-information/products/storage-2/docu5128.pdf (page 164),
but no official config.