On Thu, 2021-08-26 at 00:24 +0200, Xose Vazquez Perez wrote: > Based on current configs: > https://www.ibm.com/docs/en/flashsystem-9x00/8.4.x?topic=system-settings-linux-hosts > > Cc: Martin Wilck <mwilck@xxxxxxxx> > Cc: Benjamin Marzinski <bmarzins@xxxxxxxxxx> > Cc: Christophe Varoqui <christophe.varoqui@xxxxxxxxxxx> > Cc: DM-DEVEL ML <dm-devel@xxxxxxxxxx> > Signed-off-by: Xose Vazquez Perez <xose.vazquez@xxxxxxxxx> > --- > libmultipath/hwtable.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/libmultipath/hwtable.c b/libmultipath/hwtable.c > index 2a896440..58554cbb 100644 > --- a/libmultipath/hwtable.c > +++ b/libmultipath/hwtable.c > @@ -662,7 +662,7 @@ static struct hwentry default_hw[] = { > /* Storwize family / SAN Volume Controller / Flex > System V7000 / FlashSystem V840/V9000/9100 */ > .vendor = "IBM", > .product = "^2145", > - .no_path_retry = NO_PATH_RETRY_QUEUE, > + .no_path_retry = 5, > .pgpolicy = GROUP_BY_PRIO, > .pgfailback = -FAILBACK_IMMEDIATE, > .prio_name = PRIO_ALUA, Ref: https://github.com/opensvc/multipath-tools/issues/6 The question is on which basis IBM came up with this recommendation. 5 (aka 25s) is a rather low value. Some users may encounter unpleasant surprises if we change the default this way, as it used to be infinite before. Using 5, the IBS 2145 would have the 2nd-lowest default in hwtable.c after Dell PowerStore (3). Symmetrix has 6; all other arrays default to 10 or higher, many default to "queue". Observing that the above is the documentation for the *Flashsystem* 9200, I consider it likely that the value ".no_path_retry = 5" would apply to flash-based IBM storage products, but not to the older products such as the V7000, which unfortunately use the same device ID. It'd be helpful if someone from IBM could jump in here... Pondering the pros and cons, I vote for keeping the current defaults for now. Martin -- dm-devel mailing list dm-devel@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/dm-devel
