Re: ADSM versus Arcserve and Backup Exec
1998-09-16 05:25:26
Subject: |
Re: ADSM versus Arcserve and Backup Exec |
From: |
Gene Mangum <gmangum AT UMICH DOT EDU> |
Date: |
Wed, 16 Sep 1998 05:25:26 -0400 |
On Tue, 15 Sep 1998, David Hendrix wrote:
> We had a situation with one puny C20 with 256MB of memory where they had
> architected the application to write images files (50K to 200K each)
> into one single directory. Unfortunately, they tracked around 1.5
> million files in a 90 day period.
>
> V2 client choked and so did the V3 client (heck they couldn't even ls
> the directory!). They have rearchitected their system, and with the
I believe the extremely poor performance was due to a design problem
with JFS. We've battled with this. We think it's due to an in-core
i-node table being filled. We found that when the number of files
in a single directory exceeds the size of this table (the size of the
table is computed at boot time based on the amount of physical memory)
reading i-nodes will peg the CPU and take a looooooong time.
We opened a crit-sit (critical situation) with IBM because of a new
application which will have 1.5 million files in one directory.
Their only solution so far is to either rewrite the application or
buy a Sun.
Note that plain old "ls" is not so bad, but "ls -l", which reads the
i-nodes, takes forever at 100% CPU.
--
Gene Mangum
Gene Mangum
University of Michigan Medical Center
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- Re: ADSM versus Arcserve and Backup Exec, (continued)
- Re: ADSM versus Arcserve and Backup Exec, Shane
- Re: ADSM versus Arcserve and Backup Exec, Christo Heuer
- Re: ADSM versus Arcserve and Backup Exec, TJ Saijoen
- Re: ADSM versus Arcserve and Backup Exec, jason
- Re: ADSM versus Arcserve and Backup Exec, Keenan Stratton
- Re: ADSM versus Arcserve and Backup Exec, Richard Sims
- Re: ADSM versus Arcserve and Backup Exec, David Hendrix
- Re: ADSM versus Arcserve and Backup Exec, Carl Makin
- Re: ADSM versus Arcserve and Backup Exec, Herwig Evenepoel
- Re: ADSM versus Arcserve and Backup Exec, Lambelet,Rene,VEVEY,FC-SIL/INF.
- Re: ADSM versus Arcserve and Backup Exec,
Gene Mangum <=
- Re: ADSM versus Arcserve and Backup Exec, Richard Sims
- Re: ADSM versus Arcserve and Backup Exec, Dan Kronstadt
- Re: ADSM versus Arcserve and Backup Exec, Lambelet,Rene,VEVEY,FC-SIL/INF.
- Re: ADSM versus Arcserve and Backup Exec, Gene Mangum
- Re: ADSM versus Arcserve and Backup Exec, Jackson, Sandye
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- Re: ADSM versus Arcserve and Backup Exec, Burtenshaw, Barry L.
- Re: ADSM versus Arcserve and Backup Exec, Dan Giles
- Re: ADSM versus Arcserve and Backup Exec, Dan Giles
- Re: ADSM versus Arcserve and Backup Exec, Salvatore Greco
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