Wouter,
You didn't provide info on your disk pool setup, but a few months back on
the forum there was a discussion on whether it was better to use one big
volume or carve up the disks into multiple smaller volumes.
If you encounter media wait status during migrations at the low migration
thresholds you have set, either the "next" file won't fit in the remaining
space and all downstream tape drives are in use, or you have only one or
two disk volumes and the client can't get a lock on another volume to use
while the migration is running.
I personally subscribe to the theory that more volumes (within reason) are
better. Most of my disk pools consist of many 1000 MB volumes. I have
migration threshold set to 75% and I NEVER see "waiting for mount" messages
in the backup logs. And my disk pools are "too small" by TSM best practice
standards.
Good luck.
Tab Trepagnier
TSM Administrator
Laitram Corporation
Wouter V <wouter-v AT EASYNET DOT BE>@VM.MARIST.EDU> on 01/18/2002 05:21:27 PM
Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
Sent by: "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>
To: ADSM-L AT VM.MARIST DOT EDU
cc:
Subject: Storage Pool Migration and Mediawait question/problem
Why does the migration process cause a (large) delay for my backups
(mediawait) ?
I don't understand why backup can't continue while TSM is migrating the
data
from disk to tape ? There is still enough place in the diskpool !
Can anybody give me any hints are recommandations ?
Thank you in advance !!
Wouter V.
Storage Device Estimated Pct Pct High Low Next Stora-
Pool Name Class Name Capacity Util Migr Mig Mig ge Pool
(MB) Pct Pct
----------- ---------- ---------- ----- ----- ---- --- -----------
ARCHIVEPOOL DISK 0.0 0.0 0.0 90 70
ARCHIVEPOOL DISK 0.0 0.0 0.0 90 70
BACKUPPOOL DISK 16,720.0 63.3 57.1 60 30 PTAPE_POOL
PTAPE_POOL TAPE_CLASS 1,907,340. 4.6 100.0 100 0
0
SPACEMGPOOL DISK 0.0 0.0 0.0 90 70
Process Process Description Status
Number
-------- --------------------
----------------------------------------------
----------------------------------------------
---
---
31 Migration Disk Storage Pool BACKUPPOOL, Moved Files:
31 Migration Disk Storage Pool BACKUPPOOL, Moved Files:
42790,
Moved Bytes: 1,297,846,272, Unreadable
Files:
0,
Unreadable Bytes: 0. Current Physical File
(bytes): 2,043,904
Current output volume: 000013.
32 Migration Disk Storage Pool BACKUPPOOL, Moved Files:
6854,
Moved Bytes: 1,225,912,320, Unreadable
Files:
0,
Unreadable Bytes: 0. Current Physical File
(bytes): 14,446,592
Current output volume: 000006.
Sess Comm. Sess Wait Bytes Bytes Sess Platform Client Name
Number Method State Time Sent Recvd Type
------ ------ ------ ------ ------- ------- ----- -------- -------------
11,683 ShMem IdleW 22.6 M 1.7 K 1.1 K Node AIX BWB_ONT
11,683 ShMem IdleW 22.6 M 1.7 K 1.1 K Node AIX BWB_ONT
11,684 ShMem Run 0 S 18.7 K 6.2 G Node AIX BWB_ONT
11,685 ShMem IdleW 11.3 M 858 821 Node AIX BWB_ONT
11,697 Tcp/Ip IdleW 27.1 M 3.5 M 9.0 K Node WinNT NEWTON
11,698 Tcp/Ip MediaW 20.5 M 714 235.8 M Node WinNT NEWTON
11,703 Tcp/Ip IdleW 21.1 M 3.4 M 650 Node WinNT EINSTEIN
11,704 Tcp/Ip MediaW 21.7 M 354 22.3 K Node WinNT EINSTEIN
11,705 Tcp/Ip MediaW 21.6 M 354 3.9 K Node WinNT EINSTEIN
11,706 Tcp/Ip IdleW 20.6 M 34.8 M 840 Node WinNT EINSTEIN
11,709 Tcp/Ip IdleW 18.6 M 465.0 K 1.1 K Node WinNT ACSL1
11,710 Tcp/Ip MediaW 19.0 M 354 22.3 K Node WinNT ACSL1
11,711 Tcp/Ip IdleW 18.5 M 680.0 K 501 Node WinNT ACSL1
11,712 Tcp/Ip MediaW 18.9 M 354 8.9 K Node WinNT ACSL1
11,714 Tcp/Ip IdleW 16.4 M 1.8 M 589 Node WinNT ITF_TRA
11,715 Tcp/Ip MediaW 16.7 M 354 22.2 K Node WinNT ITF_TRA
11,716 Tcp/Ip IdleW 16.6 M 515 819 Node WinNT ITF_TRA
11,717 Tcp/Ip MediaW 16.5 M 354 5.3 K Node WinNT ITF_TRA
11,718 Tcp/Ip IdleW 9.5 M 2.2 M 546 Node WinNT BWB_TRA1
more... (<ENTER> to continue, 'C' to cancel)
11,720 Tcp/Ip MediaW 9.8 M 354 22.2 K Node WinNT BWB_TRA1
11,721 Tcp/Ip MediaW 9.7 M 360 10.7 K Node WinNT BWB_TRA1
11,722 Tcp/Ip IdleW 9.1 M 2.9 M 534 Node WinNT BWB_TRA1
11,723 Tcp/Ip IdleW 7.1 M 3.2 M 541 Node WinNT NOTES_TRA
11,724 Tcp/Ip IdleW 9.4 M 2.6 K 1.1 K Node WinNT NOTES_TRA
11,725 Tcp/Ip MediaW 7.1 M 409 64.0 M Node WinNT NOTES_TRA
11,726 Tcp/Ip MediaW 9.2 M 406 424.5 K Node WinNT NOTES_TRA
11,727 Tcp/Ip IdleW 7.2 M 2.4 M 611 Node WinNT BSC_NT3_TRA
11,728 Tcp/Ip MediaW 7.3 M 354 22.3 K Node WinNT BSC_NT3_TRA
11,729 Tcp/Ip IdleW 6.6 M 1.7 M 537 Node WinNT BSC_NT3_TRA
11,730 Tcp/Ip MediaW 7.1 M 354 5.2 K Node WinNT BSC_NT3_TRA
|
