Re: [ADSM-L] Sequential dedup pool doesn't seem to reclaim as it should
2013-06-07 06:51:35
Hi Wanda
From personal experience my reclaims show a similar behavior, and from
what I understand that used tape count will keep on increasing. The amount of
time it takes to dehydrate data from disk to copy when doing a reclaim will
impact the reclaim operation and of course the amount of volumes that it will
leave behind with data it needs.
The only time I find reclaim operations completing is during the weekends.
Does anyone have any recommendations? I've personally come to the conclusion
that having smaller stg pools is key to more efficient reclaims on deduped pools
-Nick
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Prather, Wanda
Sent: Thursday, June 06, 2013 7:49 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: [ADSM-L] Sequential dedup pool doesn't seem to reclaim as it should
TSM 6.3.3 on Win2K8-64
I have a sequential pool on disk with DEDUP=yes. (Happens to be for TSM-VE
data, but I don't think that's relevant.) Settings are below. There is 1
identify duplicates process always active.
Reclaim threshold is set to 20.
Every night the clients back up. At 4am we start the backup stgpool to a tape
copy pool.
When that is in process, several reclaims kick in on their own.
But once those are finished, they don't ever crank up again later in the day.
Every day it leaves several volumes above the reclaim threshold. Right now
there are 5.
* Identify Duplicates is finished and idle.
* No client activity.
* "Backup stgpool file-ve copypool" returns no data to be copied.
It has been that way for the last 9 hours.
If I start the reclaim myself with "reclaim stgpool file-ve threshold=20", it
runs just fine.
But it won't reclaim (and therefore dedup) on its own. Shouldn't it?
I'd like to have those volumes empty (and deduped) before the next backup cycle.
I can force it by scheduling the extra reclaim command, but I don't understand
why it doesn't kick off on its own more than once a day?
tsm: LFTSM>q stgpool file-ve f=d
Storage Pool Name: FILE-VE
Storage Pool Type: Primary
Device Class Name: ONLINEFILE
Estimated Capacity: 20,447 G
Space Trigger Util: 68.3
Pct Util: 68.3
Pct Migr: 68.3
Pct Logical: 89.3
High Mig Pct: 98
Low Mig Pct: 70
Migration Delay: 0
Migration Continue: Yes
Migration Processes: 1
Reclamation Processes: 2
Next Storage Pool:
Reclaim Storage Pool:
Maximum Size Threshold: No Limit
Access: Read/Write
Description: Dedup VE pool
Overflow Location:
Cache Migrated Files?:
Collocate?: No
Reclamation Threshold: 20
Offsite Reclamation Limit:
Maximum Scratch Volumes Allowed: 0
Number of Scratch Volumes Used: 0
Delay Period for Volume Reuse: 0 Day(s)
Migration in Progress?: No
Amount Migrated (MB): 0.00
Elapsed Migration Time (seconds): 0
Reclamation in Progress?: Yes
Last Update by (administrator): WANDA
Last Update Date/Time: 05/29/2013 10:25:01
Storage Pool Data Format: Native
Copy Storage Pool(s):
Active Data Pool(s):
Continue Copy on Error?: Yes
CRC Data: No
Reclamation Type: Threshold
Overwrite Data when Deleted:
Deduplicate Data?: Yes Processes For Identifying
Duplicates: 1
more... (<ENTER> to continue, 'C' to cancel)
Duplicate Data Not Stored: 20,588 G (60%)
Auto-copy Mode: Client Contains Data Deduplicated by
Client?: No
Wanda Prather | Senior Technical Specialist | Wanda.Prather AT icfi DOT com
| www.icfi.com ICF International | 401 E. Pratt St, Suite 2214, Baltimore, MD
21202 | 410.539.1135 (o)
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