ADSM-L

Re: baffling tape, 3584 HW compression, and stgpool design

2002-09-04 05:44:47
Subject: Re: baffling tape, 3584 HW compression, and stgpool design
From: Dan Foster <dsf AT GBLX DOT NET>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Wed, 4 Sep 2002 09:43:32 +0000
Hot Diggety! Koen Willems was rumored to have written:
>
> Maybe that the access state is "unavaileble" try "q vol f=d"
> look at the access state if it is not in a readw state use
> "update vol XXXX access=readwrite"
> Then do a move data on the volume to see if the remaining data moves
> Do a del vol and or a checkout if you want to lose the volume.

Apparently, it was bad tapes.

> Compression is automaticaly used when using format is drives.

Interesting. Guess that makes sense.

> (Do not use client compression)

Nah, wasn't planning to. The backups are fast enough that we wouldn't
have any real benefit to doing client compression.

> Storage pools give a beter restore performance on file data if the contain
> less volumes ( this cuts on mount and search times )

Ahh, makes sense.

> Make a pool for priority restore nodes ( if possible with collocation )
> Make a pool foor non priority nodes without collocation
> Make a pool for every type of TDP you install.
>
> ( colloction will cost you tapespace but will speed up restores )
> ( the less volumes an uncollocated storage pool will have the faster the
> restores )
> ( TDP pools have a beter restore performance because op the large
> sequentiall backups that kan stream back when restoring)

Makes sense. Good tip about TDP pools, thanks. Definitely will keep these
separate.

> Do not leave data on your diskpool longer then necessary.
> Further more one does not want to have backup data on a diskpool for longer
> than one backup cycle. after backup sessions do a:
>
> update stg diskpool hi=0 lo=0 and move data to tape and then offsite.

Sounds good. ;) I'm looking to concentrate all client backups in a specific
window, then have the scheduler fire off a daily job to do the migrations
(disk->tape, tape->offsite copypool) with some basic error checking, and
also do other things such as expire inventory, dbbackup, etc.

-Dan

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