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 > <xose.vazquez@xxxxxxxxx <mailto:xose.vazquez@xxxxxxxxx>> wrote: > > It doesn't make any sense to have, by default, GROUP_BY_SERIAL in > real hardware. > > Cc: Hannes Reinecke <hare@xxxxxxx <mailto:hare@xxxxxxx>> > Cc: Christophe Varoqui <christophe.varoqui@xxxxxxxxxxx > <mailto:christophe.varoqui@xxxxxxxxxxx>> > Cc: device-mapper development <dm-devel@xxxxxxxxxx > <mailto:dm-devel@xxxxxxxxxx>> > Signed-off-by: Xose Vazquez Perez <xose.vazquez@xxxxxxxxx > <mailto:xose.vazquez@xxxxxxxxx>> > --- > 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 hare@xxxxxxx +49 911 74053 688 SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg GF: J. Hawn, J. Guild, F. Imendörffer, HRB 16746 (AG Nürnberg) -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
