[dm-devel] [PATCH] ALUA support for PURE FlashArray

[Xose Vazquez Perez]

On 6/26/19 7:37 PM, Brian Bunker wrote:

> It has been some time since we updated our PURE FlashArray configuration. The
> Linux vendors that we had been seeing in the field were using very old versions
> of multipath-tools, so we haven’t needed to change anything for some time. With
> the release of RHEL8, some of our earlier values have been lost by upstream
> changes. 

Resend it, with CC: Christophe Varoqui <christophe.varoqui at opensvc.com>

> In addition we have our Active Cluster feature which leverages ALUA since our
> last patch. The ALUA confguration will work for all FlashArrays with or without
> Active Cluster.
> 
> We are changing 3 things.
> 
> 1. ALUA support
>
> 2. Fast fail timeout from the default of 5 seconds to 10 seconds (We need this
> for our FC NPIV port migration).
>
> 3. Maximum sector size of 4MB. Some Linux vendors don’t honor the block limits
> VPD page of INQUIRY).
 >
> diff --git a/libmultipath/hwtable.c b/libmultipath/hwtable.c
> index 1d964333..37e97f60 100644
> --- a/libmultipath/hwtable.c
> +++ b/libmultipath/hwtable.c
> @@ -1024,7 +1024,12 @@ static struct hwentry default_hw[] = {
>                 /* FlashArray */
>                 .vendor        = "PURE",
>                 .product       = "FlashArray",
> -               .pgpolicy      = MULTIBUS,
> +               .pgpolicy      = GROUP_BY_PRIO,
> +               .pgfailback    = -FAILBACK_IMMEDIATE,
> +               .hwhandler     = "1 alua",
> +               .prio_name     = PRIO_ALUA,
> +               .fast_io_fail  = 10,
> +               .max_sectors_kb = 4096,