[dm-devel] Promise and ALUA

[Xose Vazquez Perez]

On 8/14/20 4:18 AM, McIntyre, Vincent (CASS, Marsfield) wrote:

> This is the device section I had before for the Promise
>          device {
>                  vendor "Promise"
>                  product "VTrak"
>                  product_blacklist "VTrak V-LUN"
                    path_grouping_policy "multibus" <---------
>                  path_selector "service-time 0"
>                  path_checker "tur"
                    prio "alua"                     <---------
>                  failback "immediate"
>                  no_path_retry 30

"multibus" and "prio alua" are incompatible!

>          }
> The only real differences are the prio and failback.
 From your tests and Promise docs, it looks like it's an Active-Passive array
with ALUA support.
It should use latest firmware [1]. And ALUA must be enabled to get the best
performance and stability.
Otherwise, the array will work with only one path per LUN.

The multipath-tools default settings is already optimized for the ALUA config.


[1] https://www.promise.com/Support/DownloadCenter/VTrak/Ex30/E830f#Firmware