FYI, here are my results (using DLT7000 drives) on my three largest storage
pools... NT_TAPE is (obviously?) all NT servers, GEN_TAPE is Unix servers,
and COLOC_TAPE is collocated Unix servers. I found it interesting that we
seem to get similar results as 3590K ( I thought they were lower capacity):
tsm: ADSM>select avg(est_capacity_mb) from volumes where status='FULL' and
stgpool_name='NT_TAPE' and pct_utilized=100
Unnamed[1]
---------------------------------
44159.57391304347826
tsm: ADSM>select avg(est_capacity_mb) from volumes where status='FULL' and
stgpool_name='GEN_TAPE' and pct_utilized=100
Unnamed[1]
---------------------------------
146740.16250000000000
tsm: ADSM>select avg(est_capacity_mb) from volumes where status='FULL' and
stgpool_name='COLOC_TAPE' and pct_utilized=100
Unnamed[1]
---------------------------------
154356.40000000000000
Robin Sharpe
Berlex Laboratories
Jim Taylor
<jtaylor@ENLO
GIX.COM> To: [EMAIL PROTECTED]
cc: (bcc: Robin Sharpe/WA/USR/SHG)
06/20/01 Subject:
11:39 AM Re: Data on my tapes
Please
respond to
"ADSM: Dist
Stor Manager"
David,
for what it is worth,
Here is a excerpt from a 'q vol' of some tapes marked as full from my
system.
----------------------------------------------------------------------------
-----
Volume Name Storage Device Estimated Pct
Volume
Pool Name Class Name Capacity Util
Status
(MB)
------------------------ ----------- ---------- --------- -----
--------
C00083 TAPEPOOL TAPE3590 203,025.7 100.0 Full
C00084 TAPEPOOL TAPE3590 152,142.7 42.2 Full
C00086 OFFSITE TAPE3590 195,116.3 95.4 Full
C00087 TAPEPOOL TAPE3590 206,932.1 65.6 Full
C00093 TAPEPOOL TAPE3590 196,629.9 34.1 Full
----------------------------------------------------------------------------
-----
Most of the backups are of Oracle DB on an AIX platform. If I take into
account the size of the data being backed up and the est. cap. of the
tapes,
once full, I would have to say that the est. cap. is fairly accurate.
Jim Taylor
-----Original Message-----
From: David DeCuir [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 20, 2001 10:58 AM
To: [EMAIL PROTECTED]
Subject: Data on my tapes
Hello,
Ok, how much data are you getting on a 3590 "K" tape. From reading past
posts, I know the Pct Util and Est. Capacity method is suspect at best. All
I need is an average you guys have seen using the following:
assume the tape is full and has had no files expired or reclaimed
3590 E1A drive
devclass FORMAT is set to DRIVE (should I be using something else?)
no client compression
drive compression
3590 extended K tapes
additional info if it helps:
data per tape is either all NT or all UNIX
mostly small files on NT
about half small files on UNIX and half Oracle database files (2-20gb)
The reason I ask is that my best guess seems to be such a wide range - I
think between 60 and 150 gb per tape.
Also, according to est. cap. and pct util, UNIX volumes shows about twice
the capacity of NT volumes
I know IBM says these are 40gb native and 120gb at 3:1 compression but what
is your real world experience of just how much data fits on a tape?
Thanks for your input
David
(still new, but learning everyday)
