On Apr 26, 2007, at 4:02 AM, Salak Juraj wrote:
Hello Richard!
I understand your arguments are "either veracity or performance".
I believe the point you possibly oversee is that
if db reads were made from both sides of the mirror
then db backup performance would (with high probabilty)
signifi
DSM-L@VM.MARIST.EDU
> Betreff: Re: TSM only reads from COPY1 during DB backup
>
>If it was't a dream, I remember reading something about
> this issue. It stated that this behaviour was "by design",
> because reading blocks from both copies of a mirrored volume
&g
rds
Juraj
> -Ursprüngliche Nachricht-
> Von: ADSM: Dist Stor Manager [mailto:[EMAIL PROTECTED] Im
> Auftrag von Orville Lantto
> Gesendet: Mittwoch, 25. April 2007 21:22
> An: ADSM-L@VM.MARIST.EDU
> Betreff: Re: TSM only reads from COPY1 during DB backup
>
> P
emember reading it was actually tested.
Paul
-Original Message-
From: ADSM: Dist Stor Manager on behalf of Orville Lantto
Sent: Wed 4/25/07 16:22
To: ADSM-L@VM.MARIST.EDU
Cc:
Subject: Re: TSM only reads from COPY1 during DB backup
Performance is the issue. As tapes
From: ADSM: Dist Stor Manager on behalf of Richard Sims
Sent: Wed 4/25/2007 10:49
To: ADSM-L@VM.MARIST.EDU
Subject: Re: [ADSM-L] TSM only reads from COPY1 during DB backup
On Apr 25, 2007, at 10:55 AM, Orville Lantto wrote:
> Reads should be safe from mirrored volumes and
L PROTECTED] Im
> Auftrag von Richard Sims
> Gesendet: Mittwoch, 25. April 2007 17:49
> An: ADSM-L@VM.MARIST.EDU
> Betreff: Re: TSM only reads from COPY1 during DB backup
>
> On Apr 25, 2007, at 10:55 AM, Orville Lantto wrote:
>
> > Reads should be safe from mir
On Apr 25, 2007, at 10:55 AM, Orville Lantto wrote:
Reads should be safe from mirrored volumes and are commonly done in
operating systems to load balance. Not taking advantage of the
available IO resource is wasteful and puts an unnecessarily
unbalanced load on an already IO stressed system.
Glasshouse Technologies, Inc.
From: ADSM: Dist Stor Manager on behalf of Richard Sims
Sent: Wed 4/25/2007 09:22
To: ADSM-L@VM.MARIST.EDU
Subject: Re: [ADSM-L] TSM only reads from COPY1 during DB backup
On Apr 24, 2007, at 3:23 PM, Orville Lantto wrote:
>
On Apr 24, 2007, at 3:23 PM, Orville Lantto wrote:
Has anyone else observed that TSM only reads from COPY1 of a db
volume mirror pair during DB backup?
Why do you believe it should do otherwise? As exposited in the Admin
Guide manual, mirroring is for disk failover purposes. You can
artifici
Has anyone else observed that TSM only reads from COPY1 of a db volume mirror
pair during DB backup?
Orville L. Lantto
Glasshouse Technologies, Inc.
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