And then after you have all the underlying AIX work done, you should
create the copy storage pool device class using some reasonable size
maxcap value.  I've had reasonable success with 5000M as a starter.
Then instead of using scratch volumes (set maxscratch on the pool to
zero), use define vol stgpool /ld1/of formatsize=5000 numberofvol=256 to
create the volumes.  This will create 256 files named /ld1/of0000,
of0001, etc.  Repeat until you fill up the logical drive.  By creating
the volumes like this you avoid fragmentation on your drives.  If you
need more detail about the commands to set this up, let me know.

The key to successful use of file device class on devices of this sort
is large write back caches.  I assume you will RAID5 the drives in the
DS4800.  Since RAID5 is not particularly good for write, the cache is
very important.  We have had good luck with large disk pools using the
file device class.  Our shelves, though, have 1GB of cache. 


Kelly J. Lipp
VP Manufacturing & CTO
STORServer, Inc.
485-B Elkton Drive
Colorado Springs, CO 80907
719-266-8777
lipp AT storserver DOT com

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Andrew Carlson
Sent: Monday, December 04, 2006 10:24 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] copypools on disk on AIX?

We tried file device class with our onsite pool with disappointing
results.
I believe the problem was our decision not to stripe across LUN's.  This
would have made performance much better, at the cost of a LUN failure
causing more damage than if we used them indicidually.  Now, I can't
remember the last time I saw a LUN failure, but YMMV.  We will probably
address this issue again when the decision is made to move our copy pool
to disk.

On 12/1/06, Lawrence Clark <Larry_Clark AT thruway.state.ny DOT us> wrote:
>
> We are migrateing our copypool from cartridge to a DS4800.
>
> From the manuals copypools only support FILE type devices.
>
> My assumptions ( on AIX) are:
>
> -I create logical volumes and file systems -Define the device class 
> -TSM then creates the files in the filesystem
>
> Anyone ever done this with copypools on AIX?
>
> >>> rehorst AT POHA DOT COM 12/01/06 9:56 AM >>>
> Know of anyone using a vaulting service with transmissions over the 
> Internet with TSM? We're at capacity and looking for options.
>
> Regards,
> Orin
>
> Orin Rehorst
>
>
> The information contained in this electronic message and any 
> attachments to this message are intended for the exclusive use of the 
> addressee(s) and may contain information that is confidential, 
> privileged, and/or otherwise exempt from disclosure under applicable 
> law.  If this electronic message is from an attorney or someone in the

> Legal Department, it may also contain confidential attorney-client 
> communications which may be privileged and protected from disclosure.

> If you are not the intended recipient, be advised that you have 
> received this message in error and that any use, dissemination, 
> forwarding, printing, or copying is strictly prohibited.  Please 
> notify the New York State Thruway Authority immediately by either 
> responding to this e-mail or calling (518) 436-2700, and destroy all
copies of this message and any attachments.
>



--
Andy Carlson
------------------------------------------------------------------------
---
Gamecube:$150,PSO:$50,Broadband Adapter: $35, Hunters License:
$8.95/month, The feeling of seeing the red box with the item you want in
it:Priceless.