[dm-devel] Promise and ALUA

[Xose Vazquez Perez]

On 8/10/20 6:33 AM, McIntyre, Vincent (CASS, Marsfield) wrote:

> for many years we have been operating some Promise VTrak arrays
> without any use of the ALUA feature (largely so we don't have to
> specify LUN affinities as well, which seems to be required).
> 
> In the process of upgrading to Debian Buster
> (multipath-tools 0.7.9 and kernel 4.19)
> I find that I can no longer connect to our Promise arrays.
> They are detected but the only useful output I get is
> 
>   multipathd[986]: reconfigure (operator)
>   multipathd[986]: sdc: alua not supported
>   multipathd[986]: sdd: alua not supported
>   multipathd[986]: sdr: alua not supported
>   multipathd[986]: sde: alua not supported
>   multipathd[986]: sdf: alua not supported
>   multipathd[986]: sdg: alua not supported
>   multipathd[986]: sdh: alua not supported
>   multipathd[986]: sdi: alua not supported
> 
> 
> I found the note in the manpage about alua being selected by
> default for these arrays[1], but I'm taken aback that I'm not
> allowed to override this.
> 
> Is there really no support any more for choosing whether to use
> ALUA or not?
> 
> I have tried messing about with detect_prio, dectect_checker
> and whatnot, to no avail.

> [1] 9b5ea2eda85ae072cb697310807611c693713c2b
>      libmultipath: retain_attached_hw_handler obsolete with 4.3+

With the next array config and an empty /etc/multipath.conf,
reboot the linux host and put the output of "multipath -ll"
Redundancy Type: Active-Active
LUN Affinity: Enable
ALUA: Enable