* Multipath behavior
@ 2008-04-22 17:48 Billy Crook
2008-05-08 5:12 ` Neil Brown
0 siblings, 1 reply; 2+ messages in thread
From: Billy Crook @ 2008-04-22 17:48 UTC (permalink / raw)
To: linux-raid
I am considering implementing multipath for iSCSI. Documentation is
scant though, so I thought I'd ask my questions here.
Does mdadm multipath loadbalance IO, or just allow for failover, or both?
Is there any advantage to notifying mdadm pre-emptively if possible
before a path goes down?
I assume bringing a path online has to be done manually like adding a
disk. Can spare paths be used?
The kernel involved is 2.6.18-53.1.14.el5.
Thank you for your time.
-Billy Crook
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Multipath behavior
2008-04-22 17:48 Multipath behavior Billy Crook
@ 2008-05-08 5:12 ` Neil Brown
0 siblings, 0 replies; 2+ messages in thread
From: Neil Brown @ 2008-05-08 5:12 UTC (permalink / raw)
To: Billy Crook; +Cc: linux-raid
On Tuesday April 22, bcrook@advancedclustering.com wrote:
> I am considering implementing multipath for iSCSI. Documentation is
> scant though, so I thought I'd ask my questions here.
>
> Does mdadm multipath loadbalance IO, or just allow for failover, or both?
> Is there any advantage to notifying mdadm pre-emptively if possible
> before a path goes down?
> I assume bringing a path online has to be done manually like adding a
> disk. Can spare paths be used?
>
> The kernel involved is 2.6.18-53.1.14.el5.
>
> Thank you for your time.
I recommend against using md based multipath. It is not being
seriously maintained.
dm (aka device mapper) based multipath is where the action is.
NeilBrown
^ permalink raw reply [flat|nested] 2+ messages in thread
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