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| author | Ed Cashin <ecashin@coraid.com> | 2012-10-04 17:16:29 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-10-06 03:05:26 +0900 |
| commit | d54d35ac6605161a593e3f4411de338ef81b5263 (patch) | |
| tree | 369561cb1495afc77a918ab6e36d9b47512b4e8c | |
| parent | 3f0f0133747368fe0fcf3908f788b53591bff4e0 (diff) | |
| download | linux-3.10-d54d35ac6605161a593e3f4411de338ef81b5263.tar.gz linux-3.10-d54d35ac6605161a593e3f4411de338ef81b5263.tar.bz2 linux-3.10-d54d35ac6605161a593e3f4411de338ef81b5263.zip | |
aoe: failover remote interface based on aoe_deadsecs parameter
The aoe_deadsecs module parameter allows the user to specify a hard limit
on the number of seconds an AoE command can be retransmitted before the
AoE block device is considered to have failed.
Using aoe_deadsecs to determine the time we try using a different remote
interface helps to ensure that the hard limit is not reached before we've
tried to recover by sending to a different remote port.
As a data storage target, the AoE target is unambiguously identified by
its {major, minor} AoE address tuple, and an AoE target can have multiple
MAC addresses. However, note that "target" in the driver code and
comments means a {major, minor, MAC address} tuple, as in "somewhere to
send packets".
Signed-off-by: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | drivers/block/aoe/aoe.h | 1 | ||||
| -rw-r--r-- | drivers/block/aoe/aoecmd.c | 8 |
2 files changed, 3 insertions, 6 deletions
diff --git a/drivers/block/aoe/aoe.h b/drivers/block/aoe/aoe.h index ffded64dcbe..d17b7276397 100644 --- a/drivers/block/aoe/aoe.h +++ b/drivers/block/aoe/aoe.h @@ -96,7 +96,6 @@ enum { TIMERTICK = HZ / 10, MINTIMER = HZ >> 2, MAXTIMER = HZ << 1, - HELPWAIT = 20, }; struct buf { diff --git a/drivers/block/aoe/aoecmd.c b/drivers/block/aoe/aoecmd.c index bbab40c8d67..e3291dfa760 100644 --- a/drivers/block/aoe/aoecmd.c +++ b/drivers/block/aoe/aoecmd.c @@ -633,11 +633,9 @@ rexmit_timer(ulong vp) list_del(pos); t = f->t; - if (n > HELPWAIT) { - /* see if another target can help */ - if (d->ntargets > 1) - d->htgt = t; - } + if (n > aoe_deadsecs/2) + d->htgt = t; /* see if another target can help */ + if (t->nout == t->maxout) { if (t->maxout > 1) t->maxout--; |