RE: FAS2050C questions (clustering)

Depending on your workload you could get a decent boost by splitting it
up since that means you'll have twice as much cache servicing your
requests. Keep in mind it's not just about the disks :)


-----Original Message-----
From: owner-toasters@... [mailto:owner-toasters@...]
On Behalf Of Fox, Adam
Sent: Tuesday, June 02, 2009 12:03 PM
To: Ray Van Dolson
Cc: toasters@...
Subject: RE: FAS2050C questions (clustering)

You can split them if you like.  I only said do the 2-disk to the
"passive" side if you wanted an active/passive config.  If you want to
go active/active, then split them up.  Just be aware that depending on
your load, you may get spindle-bound at some point with that few disks
in your aggregate, but you may be fine until you get your new disks
later.

-- Adam Fox
Systems Engineer
adamfox@...


-----Original Message-----
From: Ray Van Dolson [mailto:rvandolson@...]
Sent: Tuesday, June 02, 2009 12:01 PM
To: Fox, Adam
Cc: toasters@...
Subject: Re: FAS2050C questions (clustering)

On Tue, Jun 02, 2009 at 08:54:35AM -0700, Fox, Adam wrote:
> You are correct that clustering is treated as two separate controllers
> which can take over for each other.  You cannot vif across NICs on
> different controllers.
>
> If you want to do the closest thing to active/passive would be to
> allocate at least 2 (possible 3 if you want a spare) disks to the
> "passive" controller and the rest to the active one.  I'd set up a
raid4
> trad vol or aggregate for it since you only are going to use 2 disks,
> you don't need raid_dp.  Definitely use raid_dp on the active
> controller.  
>
> Under this scenario, you can lose either controller head and still be
> running.

Ah, so we need to have disks assigned to the "passive" controller in an
aggregate configuration?  What if I just split the disks up evenly,
would the aggregate on "active" controller shift down to be controlled
by the "passive" controller automatically?

Maybe this would be preferrable to having 2 or 3 disks doing "nothing"
on the second head.

Thanks for the response.

>
> -- Adam Fox
> Systems Engineer
> adamfox@...

Ray



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