Can I have some of your data please?
Don't let marketing get a hold of this!
Kelly J. Lipp
Storage Solutions Specialists, Inc.
PO Box 51313
Colorado Springs CO 80949-1313
(719) 531-5926
Fax: (240) 539-7175
Email: [EMAIL PROTECTED] or [EMAIL PROTECTED]
www.storsol.com
www.storserver.com
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED]]On Behalf Of
Joerg Pohlmann/CanWest/IBM
Sent: Tuesday, August 28, 2001 5:02 PM
To: [EMAIL PROTECTED]
Subject: Re: I don't think she can hold much more Captain! She's gonna
blow! (IBM LTO Tape)
I have seen exactly the same type of results. One of my customers routinely
gets 250+GB per tape; and in one other instance my customer got 400+GB,
similar to what you are experiencing. Compression results are a function of
the type of data. If you are using collocation, the compressability becomes
more obvious for the type of data because a given node is clustered on a
cartridge. For example if your clients compress their data, you will find
tape capacities much closer to 100GB. In my case, the 400+ GB client was an
API database client that sent very compressable data.
Remember that the total amount of data written to the tape only shows up
when the tape is marked "full". When it is "filling", TSM will keep on
writing to the tape and you will see the Estimated Capacity increase.
Joerg Pohlmann
Jim Taylor <[EMAIL PROTECTED]>@VM.MARIST.EDU> on 2001-08-28 15:47:29
Please respond to "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
Sent by: "ADSM: Dist Stor Manager" <[EMAIL PROTECTED]>
To: [EMAIL PROTECTED]
cc:
Subject: I don't think she can hold much more Captain! She's gonna blow!
(IBM LTO Tape)
How much can these 100GB native tapes hold?
Can I really be getting this kind of compression?
Half a TB on one tape? Anyone else seeing this?
My real issue is with the Status. It says that the tape is still filling,
yet its Pct Util is only at 95%.
I don't get this. I thought that a tape get to 100% full and the Est Cap
keeps increasing until EOT is met. At which time the Status changes to
Full
and the Pct Util can then drop from 100% as the data on the tape expires.
Have I been wrong???
tsm: TSM-D2>q vol
Volume Name Storage Device Estimated Pct
Volume
Pool Name Class Name Capacity Util
Status
(MB)
------------------------ ----------- ---------- --------- -----
--------
/tsm/tsmstg/disk-vol01 DISKPOOL DISK 5,000.0 30.5
On-Line
A00000 TAPEPOOL LTOTAPE 100,000.0 7.2
Filling
A00007 TAPEPOOL LTOTAPE 204,800.0 2.6
Filling
A00023 TAPEPOOL LTOTAPE 384,482.9 65.0 Full
A00031 TAPEPOOL LTOTAPE 398,471.2 64.4 Full
A00035 TAPEPOOL LTOTAPE 537,664.2 85.3
Filling
tsm: TSM-D2>
> Jim Taylor
> Senior Associate, Technical Services
> Enlogix
> * E-mail: [EMAIL PROTECTED]
> * Office: (416) 496-5264 ext. 286
> * Cell: (416)458-6802
> * Fax: (416) 496-5245
>
>
