ADSM-L

Re: query stgp

2004-10-05 08:44:07
Subject: Re: query stgp
From: "Johnson, Milton" <milton.johnson AT CITIGROUP DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Tue, 5 Oct 2004 08:45:30 -0400
 From "help q stg":
Pct Util
     An estimate of the utilization of the storage pool, as a
percentage.

     For sequential access devices, this is expressed as a percentage of
the
     number of active bytes on each sequential access volume and the
     estimated capacity of all volumes in the storage pool.

     For disk devices, this is expressed as a percentage of the
estimated
     capacity, including cached data and data that resides on any
volumes
     that are varied offline. The value for Pct Util can be higher than
the
     value for Pct Migr if you issue this command while a file creation
     transaction is in progress. The value for Pct Util is determined by
the
     amount of space actually allocated (while the transaction is in
     progress). The value for Pct Migr represents only the space
occupied by
     committed files. At the end of the transaction, these values become
     synchronized.

     The Pct Util value includes cached data on disk volumes. Therefore,
     when cache is enabled and migration occurs, the Pct Util value
remains
     the same because the migrated data remains on the volume as cached
     data. The Pct Util value decreases only when the cached data
expires or
     when the space that cached files occupy needs to be used for
noncached
     files.

So for DASD-NAS you used have ~62.496GB including cached data

Pct Migr (primary storage pools only)
     An estimate of the percentage of data in the storage pool that can
be
     migrated. The server uses this value and the high and low migration
     thresholds to determine when to start and stop migration.

     For disk devices, this value is specified as a percentage of the
value
     for the estimated capacity, excluding cached data, but including
data
     on any volumes varied offline.

     For sequential access devices, this value is the percentage of the
     total number of volumes in the pool that contain at least 1 byte of
     active data. The total number of volumes includes the maximum
number of
     scratch volumes.

     The Pct Util value includes cached data on a volume; the Pct Migr
value
     excludes cached data. Therefore, when cache is enabled and
migration
     occurs, the Pct Migr value decreases but the Pct Util value remains
the
     same because the migrated data remains on the volume as cached
data.
     The Pct Util value decreases only when the cached data expires or
when
     the space that cached files occupy needs to be used for noncached
files.

I'm guessing you have cache enabled, so looking at the "q stg" report
below,
I appears that all of the data in DASD-NAS has been migrated to 3494NAS,
so
all ~62.496GB of the data in DASD-NAS is in a "cached" state.

Doe this help?

H. Milton Johnson
 
-----Original Message-----
From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of
Hashim, Shukrie BSP-ISM/116
Sent: Monday, October 04, 2004 10:39 PM
To: ADSM-L AT VM.MARIST DOT EDU
Subject: query stgp

Hi all,

I have Version 5, Release 1, Level 9.4 can somebody explain to me 

Storage       Device        Estimated     Pct     Pct   High   Low
Next       
Pool Name     Class Name     Capacity    Util    Migr    Mig   Mig
Storage    
                                 (MB)                    Pct   Pct
Pool       
-----------   ----------   ----------   -----   -----   ----   ---
-----------
DASD-NAS      DISK               63 G    99.2     0.0      0     0
3494NAS    
DASDFS        DISK               18 G     0.0     0.0     60     0
3494FS     
DASDHSM       DISK               19 G    13.9     0.2     50    30
3494HSM    

pct util : is this the cache or the actual disk 

pct migr : is this the actual disk or the percentage migrated to tapes 

for example DASD-NAS has a pct util of 99.2 so meaning .. it means that
it's full but I dunno what is full either the disk is full or the cache
is full ? somebody please explain to me the meaning of the table ...
above

Thanks 

Regards
Shukrie

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