Re: %Migr > %Util ??

got it. it's meaning is different from "for disk" to "for sequential"
volumes. i shall setup highmig 100 lowmig 90 then. still, i would not want
to migrate data when %Util is just 44% for my tape library. my
tape pool is a bit messed up tho'. interesting incident. :)


thanks Nick.


yu chen



adsm> q stgpool dlt-library

Storage         Device          Estimated     %Util     %Migr     High      Low 
    Next
Pool Name       Class Name       Capacity                         Mig%     Mig% 
    Storage
                                     (MB)                                       
    Pool
-----------     ----------     ----------     -----     -----     ----     ---- 
    -----------
DLT-LIBRARY     DLT-AUTO        306,440.7      43.2      90.0       98       80 
    8MM-LIBRARY
DLT-LIBRARY     DLT-AUTO        306,440.7      43.2      90.0       98       80 
    8MM-LIBRARY

adsm> q vol dlt*

Volume Name                  Storage         Device         Estimated     %Util 
     Volume
                             Pool Name       Class Name      Capacity           
     Status
                                                                 (MB)
------------------------     -----------     ----------     ---------     ----- 
    --------
DLT001                       DLT-LIBRARY     DLT-AUTO        27,578.4      58.8 
      Full
DLT001                       DLT-LIBRARY     DLT-AUTO        27,578.4      58.8 
      Full
DLT002                       DLT-LIBRARY     DLT-AUTO        27,125.5      68.4 
      Full
DLT003                       DLT-LIBRARY     DLT-AUTO        26,602.9      78.4 
      Full
DLT004                       DLT-LIBRARY     DLT-AUTO        28,405.5      65.2 
      Full
DLT005                       DLT-LIBRARY     DLT-AUTO        27,925.6      63.7 
      Full
DLT006                       DLT-LIBRARY     DLT-AUTO        30,638.8      60.2 
      Full
DLT007                       DLT-LIBRARY     DLT-AUTO        35,840.0      50.9 
    Filling
DLT008                       DLT-LIBRARY     DLT-AUTO        35,840.0       6.7 
    Filling
DLT009                       DLT-LIBRARY     DLT-AUTO        35,840.0       3.8 
    Filling
DLT010                       DLT-LIBRARY     DLT-AUTO             0.0       0.0 
     Empty





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On Thu, 29 Oct 1998, Nicholas Cassimatis wrote:

** DASD pools normally show the same values for %Mig and %Util, but for tape, it
** normally doesn't.  From what I understand, from my own systems, %Mig 
measures,
** basically, the % of tapes in use, with any data on them.  %Util shows how 
much
** of that space is actually used.
**
** I have a storage pool, 3 tapes (it's archive data), shows 73.8%Util, 100%Mig.
** All 3 tapes have data on them, but
** one is only about 1/3 full.
**
** I may be wrong, but my theory has held out for me thus far.
**
** Nick Cassimatis
** nickpc AT us.ibm DOT com
**
** If you don't have the time to do it right the first time, where will you find
** the time to do it again?
**