Re: qla2xxx behavior with changing volumes

[Vladislav Bolkhovitin <vst@vlnb.net>]

Vladislav Bolkhovitin wrote:
> Sean Bruno wrote:
> 
>> What is the expected behavior when volumes on a SAN change size and LUN
>> ID order?
>>
>> I've noticed that if a volume changes size, leaves the SAN or changes
>> target ID it isn't auto-magically picked up by a 2.6.18 based
>> system(running CentOS 5).
>>
>> If a new target appears on the SAN however, it is noticed and assigned a
>> new drive letter.
> 
> 
> For changes in the volume size the target (SAN) should generate 
> "CAPACITY DATA HAS CHANGED" Unit Attention.
> 
> For changes in the LUN ID order the target should generate "REPORTED 
> LUNS DATA HAS CHANGED" Unit Attention.
> 
> On these notifications initiator is supposed to make the appropriate 
> actions, like rescan the SAN in case of "REPORTED LUNS DATA HAS 
> CHANGED". Unfortunately, Linux just ignores them as well as the majority 
> of other Unit Attentions, hence you have to restart the system or, at 
> least, the corresponding driver to see the changes.

Or, I forgot, do the manual rescan via sysfs "rescan". Sometimes it 
helps too.

> Vlad
>