As for the TSM database, I would be very curious to know how fast a
database on ssd with a recent cpu (Power6 anyone?) would audit....
Since there is no seek-time a db on ssd should just fly....
On Oct 14, 2008, at 19:28 , Timothy Hughes wrote:
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:[EMAIL PROTECTED] On
Behalf
Of Allen S. Rout
Sent: Tuesday, October 14, 2008 10:50 AM
To: [email protected]
Subject: Re: [ADSM-L] Backup order
On Tue, 14 Oct 2008 10:08:54 -0500, Howard Coles
<[EMAIL PROTECTED]> said:
The best I can remember you can't "migrate" into a copypool.
Right. :)
Additionally,
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] On
Behalf
Of Orin Rehorst
Sent: Monday, October 13, 2008 5:20 PM
To: [email protected]
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
[EMAIL PROTECTED]
+31 6 24821 622
--
Met vriendelijke groeten,
Remco Post
[EMAIL PROTECTED]
+31 6 248 21 622
