My 2-cents
I've always read notes about OS mirroring V.S. TSM mirroring with interest. I
understand the arguments and they sure seem logical and scare me into thinking I need
to do TSM mirroring on my systems.
However, we have been running 8 TSM servers on AIX
Hi everybody,
I have read several discussions in the archive about the TSM mirroring
versus OS/Hardware mirroring of the database and/or log.
Both those discussions and the Administrator's Guide mention "partial
page writes". To see if I understand correctly:
- When writing a
Thank you,
Bandu Vibhute,
George Weston Bakeries Inc.
Voice: 631-951-5212,
Cell: 516-702-0323
-Original Message-
From: Toora, Kuli [mailto:[EMAIL PROTECTED]]
Sent: Tuesday, August 21, 2001 10:40 AM
To: [EMAIL PROTECTED]
Subject: Re: TSM mirroring again
John,
I have not been through
Toora
Storage Administrator
Npower
mail to : [EMAIL PROTECTED]
-Original Message-
From: John Naylor [mailto:[EMAIL PROTECTED]]
Sent: 21 August 2001 15:13
To: [EMAIL PROTECTED]
Subject: TSM mirroring again
I know this must be a pretty boring subject, but anyone been there ?
This can'
I know this must be a pretty boring subject, but anyone been there ?
This can't be the first time anyone has gone down this road.
Would appreciate your experience
John Naylor
08/16/2001 04:35 PM
Sent by: John Naylor
To: [EMAIL PROTECTED]
cc:
Subject: TSM mirroring
Hi all Tsmer
Hi all Tsmers,
I am looking to introduce database/recovery log mirroring into into our OS390
TSM 3.7.20
environment to cater for cross site disaster recovery.
The thinking is to use our cross site dasd capability to have the primary
database and recovery log volumes written at site1 and the mirro
Thanks Dave,
After endless discussions with various people we understand that PPRC will
propogate partially written pages to both mirrors. Therefore like you, we
have decided to recommend TSM mirroring to the customer.
Richard Bates
Storage Specialist
ITS - SB - Enterprise Consultancy Services
My experience has been that moving the db from ssa to san attached shark I
have seen an improved data base response time.
-Original Message-
From: Jeff Bach [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 13, 2001 7:25 AM
To: [EMAIL PROTECTED]
Subject: Re: tsm mirroring vs pprc
How
, June 12, 2001 9:28 PM
To: [EMAIL PROTECTED]
Subject:Re: tsm mirroring vs pprc
Dave, what the level of the TSM server that caused this problem?
On Tue, 12 Jun 2001, Frost, Dave wrote:
> Richard,
>
> "BTDTGTTS"
EMAIL PROTECTED]
Subject: Re: tsm mirroring vs pprc
Dave, what the level of the TSM server that caused this problem?
On Tue, 12 Jun 2001, Frost, Dave wrote:
> Richard,
>
> "BTDTGTTS"
>
> We are running tsm using san attached emc for all disk storage. On
initial
> set
of course. In each case, the database had to be restored. Given a 35 GB
> database, a restore can take about 2.5 hours.
>
> IBM said that they "strongly recommend tsm mirroring", preferably with
> verification.
>
> So do we, now.
>
> regards
>
> -=Dave=-
>
the server failed to restart because of an inconsistency in the
db log file. The emc mirroring had faithfully replicated the inconsistency,
of course. In each case, the database had to be restored. Given a 35 GB
database, a restore can take about 2.5 hours.
IBM said that they "strongly recommen
Richard Bates wrote:
> However company strategy says that *all* mirroring must be done via PPRC.
> Does anyone have any experience with PPRC? Can it cope with partial page
> writes? Am I safer to use TSM mirroring?
This question stirs more advocacy threads than anythin else.
There se
Richard,
PPRC is a true copy of the original (at least that is how it is supposed to
be) thus partially written files will be partial writhed files on the PPRC
copy too. I suggest that you use TSM mirroring (I assume you use the ESS in
RAID 5).
I hope your customer understands the statement about
Folks,
Customer site: TSM running on AIX. 2 x IBM Enterprise Storage Server, one
per data centre. SAN connecting it all together.
Problem: I've seen and read all the posts about TSM mirroring vs AIX
mirroring vs RAID mirroring. I understand the probem with partial page
writes and prefe
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