speaking of  Disk is anyone using Solid State Disk? or would that not be
useful in the TSM environment at least not yet. Also, aren't they still
extremely costly?  Just asking because someone brought that up this
morning in conversation.

regards
Tim



Remco Post wrote:

On 14 okt 2008, at 18:19, Howard Coles wrote:

Really?  That's odd because from my experience I've never found tape
to
tape as fast as disk to tape.  I guess it depends on a lot of factors,
but generally speaking I've gotten better speeds going from disk,
mainly
because read times are faster from disk (especially properly
configured
local disk).

well, current tape-devices do about 120-200 MB/s, you'll really have
to push a disk to do that, so as long as you can keep your tapes
streaming....

As for disk, I might see an advantage in collocated pools, since those
will require a lot of load/unload actions from tape, but generally,
you'll find that you're doing more than one task on a single disk at
any time and keeping the disk in sequential-read or write mode is very
hard.... (seagate quotes their cheetah's as going up to 125 MB/s, a
bit less than an enterprise tape drive).

See Ya'
Howard

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf
Of Allen S. Rout
Sent: Tuesday, October 14, 2008 10:50 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] Backup order

On Tue, 14 Oct 2008 10:08:54 -0500, Howard Coles

<Howard.Coles AT ARDENTHEALTH DOT COM> said:

The best I can remember you can't "migrate" into a copypool.

Right. :)

Additionally,

-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On

Behalf

Of Orin Rehorst
Sent: Monday, October 13, 2008 5:20 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Backup order

Our TSM was set up to nightly:

1. backup the VTLpool to copypool
2. backup the tapepool to copypool
3. migrate stg VTLpool (to tapepool)

Step 2 is tape-to-tape and therefore slow.

I think that you will find tape-to-tape to be as fast or faster than
disk-to-tape.

- Allen S. Rout

--

Remco Post
r.post AT plcs DOT nl
+31 6 24821 622