Geoff --
How have you defined your device class?
Device Class Name: NIBLTO
Device Access Strategy: Sequential
Storage Pool Count: 26
Device Type: LTO
Format: DRIVE
Est/Max Capacity (MB):
Mount Limit: DRIVES
Usage as reported for SAP/R3 Oracle:
333032 PRDSAP-LT NIBLTO 381,468.0 46.3
Filling
333035 PRDSAP-LT NIBLTO 873,285.9 21.2
Full
The 381,468 represents a possible two-to-one compression (these are
LTO2); the 873,285 shows I got about 4.6 to one compression. On the
other hand, MS-Exchange:
333028 NT-EXCH-LT NIBLTO 381,468.0 1.0
Filling
333033 NT-EXCH-LT NIBLTO 329,343.3 75.5
Full
The guestimate is still 381,468. But I maxed out at 329,343 -- Exchange
data does not compress as well as Oracle.
HTH --
Tom Kauffman
NIBCO, Inc
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Gill, Geoffrey L.
Sent: Thursday, April 20, 2006 12:29 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: tape capacity
Why it is LTO2 capacity reads differently than 3590's. My 3590's report
40GB
when filling and "at least" 40GB when full. K tapes read 20/40 and
LTO2's
200/400. So why wouldn't it show at least 400?
Is this a TSM, LTO or some other issue causing this?
Is a tape reporting 215GB when full really holding more than that?
It also makes no sense if estimated capacity is 400GB, and the drive is
capable of supporting that, it only reports 200.
Thanks,
Geoff Gill
TSM Administrator
PeopleSoft Sr. Systems Administrator
SAIC M/S-G1b
(858)826-4062
Email: geoffrey.l.gill AT saic DOT com
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Troy Frank
Sent: Thursday, April 20, 2006 6:21 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: collocation groups
Here's what I'm guessing is happening with your tape utilization
numbers, as I've seen that here too. Until the tape is actually full,
it seems to base it's %full on the "estimated capacity" of the device
class. So I'm thinking you probably set your lto2 dev class to 400GB.
Once the tape is full, tsm switchs to stating the ACTUAL amount of data
it got on the tape. The other peculiarity I noticed is that it doesn't
seem to take compression into account in that number. To be honest it's
still a little confusing to me as well. It seems to only show native
capacity (~200GB), but yet some tapes show a bit more (~235GB), as if
it did take some compression into account. That shouldn't be right
either though, as I know my data is more compressible than 17%.
>>> GEOFFREY.L.GILL AT SAIC DOT COM 4/19/2006 6:50 PM >>>
Question related to collocation groups:
If 10 nodes are in one group will it only mount one tape even if no
other
tape drives are busy?
If I have a directory disk pool that is cached will it still go to one
tape
after migration or will collocation groups affect that? What I see
leads me
to believe the answer is yes. I am seeing multiple tapes for the
directory
tape pool with little to no data. Do folks still use this option?
Why do tapes that are not full show capacity of 381GB yet when they go
full
only show about 200GB? Do I need to force compression on with the
drives or
something? (LTO2's, 3584 Lib)
Thanks,
Geoff Gill
TSM Administrator
PeopleSoft Sr. Systems Administrator
SAIC M/S-G1b
(858)826-4062
Email: < mailto:geoffrey.l.gill AT saic DOT com > geoffrey.l.gill AT saic DOT
com
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