[dm-devel] [PATCH] multipath-tools: preload also scsi_dh_hp_sw before run multipathd

[Hannes Reinecke]

On 10/12/2016 01:37 PM, Xose Vazquez Perez wrote:
> On 10/11/2016 03:41 PM, Hannes Reinecke wrote:
>
>> On 10/11/2016 02:55 PM, Xose Vazquez Perez wrote:
>>> Cc: Hannes Reinecke <hare at suse.de>
>>> Cc: Christophe Varoqui <christophe.varoqui at opensvc.com>
>>> Cc: device-mapper development <dm-devel at redhat.com>
>>> Signed-off-by: Xose Vazquez Perez <xose.vazquez at gmail.com>
>>> ---
>>>  multipathd/multipathd.service | 2 +-
>>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>>
>>> diff --git a/multipathd/multipathd.service b/multipathd/multipathd.service
>>> index e3d6f91..45aca35 100644
>>> --- a/multipathd/multipathd.service
>>> +++ b/multipathd/multipathd.service
>>> @@ -11,7 +11,7 @@ Conflicts=shutdown.target
>>>  Type=notify
>>>  NotifyAccess=main
>>>  LimitCORE=infinity
>>> -ExecStartPre=/sbin/modprobe -a scsi_dh_alua scsi_dh_emc scsi_dh_rdac dm-multipath
>>> +ExecStartPre=/sbin/modprobe -a scsi_dh_alua scsi_dh_emc scsi_dh_hp_sw scsi_dh_rdac dm-multipath
>>>  ExecStart=/sbin/multipathd -d -s
>>>  ExecReload=/sbin/multipathd reconfigure
>>>
>> If you can point me to a single user of an MSA1500 I'm happy to include it. If you don't
>> know what an MSA1500 is nor what hp_sw does it's probably not a good idea to have it.
>
> Why?
>
> scsi_dh_hp_sw is used also for dec/compaq ESA12000 and RA8000 arrays with HSG80 controller.
> And in HP MSA 1000/1500 and EVA 3000/5000, with old firmware.
>
EVA? I sincerely doubt that.
Do you really have an example for that?

Anyway.
Point here is, these are _really_ old SCSI parallel arrays. And the 
failover command is _really_ stupid (just send a START STOP UNIT to the 
passive path).
As this has a tendency to interfere with normal operation I prefer to 
_NOT_ have it loaded per default; in fact, I'm on the verge of removing 
it altogether.

Cheers,

Hannes
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare at suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
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