Tape drives do tend to grow compressed data. I have several storage pools that
have most of the tapes full 5-10% lower than the capacity.
You may be seeing some of that problem. Also you may be seeing TSM not report
the tape is full until after the whole object is written. TSM appears to not
consider an object stored until the whole object is on tape. If it is a 100GB
object and 90GB is on the first tape it may not show full (90GB short) until
the last 10GB is written to another tape.
TSM will write a partial object to a tape because TSM does not know how much
space is left on a tape.
If you are into testing you might try turning compression off to see if it
helps.
Andy Huebner
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Tuncel Mutlu (BT Isletim ve Teknik Destek Bölümü)
Sent: Thursday, September 24, 2009 11:15 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: [ADSM-L] LTO-2 capacity problem
Yes it is happening all the time. The files are mainly Exchange PST files -
size from 2 to 12 GB. Also 2 Windows boxes System State + Windows folder +
Program Files (it is less 4-5 GB each) . I try to backup 172 GB of data
(besides the Windows sistem about 30,000 files only), but it does only about
127-130 GB.
What do you mean by files expanding during effort to compress again (I am not
using any kind of TSM software compression) ? These are PST files so they may
be self-compressed.
Regards,
Tuncel Mutlu
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Huebschman, George J.
Sent: Thursday, September 24, 2009 6:55 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: Re: LTO-2 capacity problem
Does it happen every time?
What is the size range of the files going to the tape?
Is it possible that already compressed files are expanding during an effort to
compress them again?
If TSM is trying to write a file or aggregate larger than the remaining space
on the media, it won't use the remaining space.
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Tuncel Mutlu (BT Isletim ve Teknik Destek Bölümü)
Sent: Thursday, September 24, 2009 11:49 AM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] LTO-2 capacity problem
Hi,
I have a strange problem. I have a Windows TSM server on a remote site with
stand-alone LTO-2 drive (Dell sold Tanberg TS400). I take backups to the disk
and than migrate the pool to the drive (the is an empty one witing every time).
After writing between 127-130 GB, the tape dismounts and asks for a new one
(scratch), as it is full, but it is not (nominal capacity is 200 GB, compressed
400 GB). I looked at the device class and other things but could find a
problem. Checked with remote site to be sure if this is LTO-2, and yes, it is.
Even tried to manually set the max capacity, but still doesnt work. Have this
occured to you ?
Windows TSM server 5.5.3.0
Windows clients 5.5.2.2
09/24/2009 05:30:56 ANR2753I (WEDNESDAY_MAINT):ANR0984I Process 150 for
MIGRATION (SESSION: 5864)
09/24/2009 05:30:56 ANR2753I (WEDNESDAY_MAINT):started in the FOREGROUND at
05:30:56. (SESSION: 5864)
09/24/2009 05:30:56 ANR2753I (WEDNESDAY_MAINT):ANR2110I MIGRATE STGPOOL
started as (SESSION: 5864)
09/24/2009 05:30:56 ANR2753I (WEDNESDAY_MAINT):process 150. (SESSION: 5864)
09/24/2009 05:30:56 ANR2753I (WEDNESDAY_MAINT):ANR1000I Migration process 150
started (SESSION: 5864)
09/24/2009 05:30:56 ANR2753I (WEDNESDAY_MAINT):for storage pool DISKPOOL
manually, (SESSION: 5864)
09/24/2009 05:30:56 ANR2753I (WEDNESDAY_MAINT):highMig=99, lowMig=0,
duration=No. (SESSION: 5864)
09/24/2009 05:30:56 ANR8326I 078: Mount LTO volume SCRTCH R/W in drive
GENDRV_0.0.5 (mt6.0.0.5) of library LTOLIB1 within 60
minutes. (SESSION: 5864, PROCESS: 150)
09/24/2009 05:31:12 ANR8328I 078: LTO volume WED001 mounted in drive
GENDRV_0.0.5 (mt6.0.0.5). (SESSION: 5864, PROCESS: 150)
09/24/2009 05:31:20 ANR1340I Scratch volume WED001 is now defined in storage
pool LTOPOOL1. (SESSION: 5864, PROCESS: 150)
09/24/2009 05:31:37 ANR0513I Process 150 opened output volume WED001.
(SESSION: 5864, PROCESS: 150)
09/24/2009 06:36:25 ANR0515I Process 150 closed volume WED001. (SESSION: 5864,
PROCESS: 150)
09/24/2009 06:36:35 ANR8336I Verifying label of LTO volume WED001 in drive
GENDRV_0.0.5 (mt6.0.0.5). (SESSION: 5864, PROCESS: 150)
09/24/2009 06:38:22 ANR8468I LTO volume WED001 dismounted from drive
GENDRV_0.0.5 (mt6.0.0.5) in library LTOLIB1. (SESSION:
5864, PROCESS: 150)
09/24/2009 06:38:22 ANR8326I 079: Mount LTO volume SCRTCH R/W in drive
GENDRV_0.0.5 (mt6.0.0.5) of library LTOLIB1 within 60
minutes. (SESSION: 5864, PROCESS: 150)
LTO Device Classes : LTOCLASS1
Device Class Name
LTOCLASS1
Device Access Strategy
Sequential
Storage Pool Count
1
Device Type
LTO
Format
ULTRIUM2C
Est/Max Capacity
400G
Mount Limit
1
Mount Wait (min)
60
Mount Retention (min)
240
Label Prefix
ADSM
Drive Letter
-
Library
LTOLIB1
Directory
-
Server Name
-
Retry Period
-
Retry Interval
-
Twosided
-
Shared
-
HLAddr
-
Minimum Capacity
-
WORM
NO
Drive Encryption
ALLOW
Scaled Capacity
-
Last Update by (administrator)
ADMIN
Last Update Date/Time
2009-09-18 12:14:14.000000
Volume Name Storage Device Estimated Pct Volume
Pool Name Class Name Capacity Util Status
------------------------ ----------- ---------- --------- ----- --------
D:\TSMDATA\SERVER1\DISK- DISKPOOL DISK 51.2 G 21.8 On-Line
01.DSM
D:\TSMDATA\SERVER1\DISK- DISKPOOL DISK 51.2 G 13.7 On-Line
02.DSM
D:\TSMDATA\SERVER1\DISK- DISKPOOL DISK 51.2 G 15.0 On-Line
03.DSM
D:\TSMDATA\SERVER1\DISK- DISKPOOL DISK 51.2 G 37.4 On-Line
04.DSM
FRI001 LTOPOOL1 LTOCLASS1 409.6 G 31.3 Filling
WED001 LTOPOOL1 LTOCLASS1 409.6 G 31.7 Filling
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