ADSM-L

Re: When is 30% of 100 equal to 21 ?

2001-09-19 07:29:02
Subject: Re: When is 30% of 100 equal to 21 ?
From: Mark Stapleton <stapleto AT BERBEE DOT COM>
Date: Wed, 19 Sep 2001 06:29:45 -0500
On Tue, 18 Sep 2001 15:22:55 -0400, it was written:
>An interesting anomoly.
>
>I did a Q STG and got the following:
>
>Storage      Device       Estimated    Pct    Pct
>Pool Name    Class Name    Capacity   Util   Migr
>                               (MB)
>-----------  ----------  ----------  -----  -----
>SPBACKUP     DISK         100,921.7   30.8   30.8
>
>Now, my simple math says that 30% utilized of 100G should be roughly 30G.
>
>However, when I started migration, I got:
>
>ANR1001I,Migration process 20 ended for storage pool SPBACKUP.
>ANR0986I Process 20 for MIGRATION running in the BACKGROUND processed
>120840
>items for a total of 22,116,016,128 bytes with a completion state of
>SUCCESS at
>12:23:05.
>
>which is app.  21GB.

That's why it's called "Estimated". Estimated capacity is determined
in part by the amount of compression in the volume, which is almost
always in a state of flux; this is because some types of data allow
for greater compression than others.

--
Mark Stapleton (stapleton AT berbee DOT com)
Mark Stapleton (stapleton AT berbee DOT com)
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