On 10/03/2016 01:02 PM, Christophe Varoqui wrote:
> Hi Xose,
>
> Group by serial sure can make sense for hardware not capable of multibus.
>
> Can you or Hannes (listed as maintainer for IBM) confirm the concerned
> IBM arrays are multibus capable ?
>
> Best regards,
> Christophe Varoqui
> OpenSVC
>
> On Thu, Aug 18, 2016 at 7:58 PM, Xose Vazquez Perez
> <[email protected] <mailto:[email protected]>> wrote:
>
> It doesn't make any sense to have, by default, GROUP_BY_SERIAL in
> real hardware.
>
> Cc: Hannes Reinecke <[email protected] <mailto:[email protected]>>
> Cc: Christophe Varoqui <[email protected]
> <mailto:[email protected]>>
> Cc: device-mapper development <[email protected]
> <mailto:[email protected]>>
> Signed-off-by: Xose Vazquez Perez <[email protected]
> <mailto:[email protected]>>
> ---
> libmultipath/hwtable.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/libmultipath/hwtable.c b/libmultipath/hwtable.c
> index aa3ea9b..72b5e1d 100644
> --- a/libmultipath/hwtable.c
> +++ b/libmultipath/hwtable.c
> @@ -443,7 +443,7 @@ static struct hwentry default_hw[] = {
> /* DS4200 / FAStT200 */
> .vendor = "IBM",
> .product = "^3542",
> - .pgpolicy = GROUP_BY_SERIAL,
> + .pgpolicy = MULTIBUS,
> .pgfailback = FAILBACK_UNDEF,
> },
This is the IBM FAStT 200, which is IIRC an RDAC machine. So multibus
will be wrong here, and it should be using the RDAC entry instead.
> {
> @@ -451,7 +451,7 @@ static struct hwentry default_hw[] = {
> .vendor = "IBM",
> .product = "^2105",
> .no_path_retry = NO_PATH_RETRY_QUEUE,
> - .pgpolicy = GROUP_BY_SERIAL,
> + .pgpolicy = MULTIBUS,
> .pgfailback = FAILBACK_UNDEF,
> },
> {
That's the old IBM ESS 800; this is a fully symmetric active-active
array. So yes, multibus is correct here.
Cheers,
Hannes
--
Dr. Hannes Reinecke zSeries & Storage
[email protected] +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg)
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