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
> setup of the emc, we decided to stop using log/db mirroring, and use the emc
> mirroring instead.
>
> Soon afterwards, we had 2 instances where we could not restart the server.
> Both times 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 recommend tsm mirroring", preferably with
> verification.
>
> So do we, now.
>
> regards
>
> -=Dave=-
>
> -----Original Message-----
> From: Richard Bates [mailto:Richard_Bates AT UK.IBM DOT COM]
> Sent: 08 June 2001 12:25
> To: ADSM-L AT VM.MARIST DOT EDU
> Subject: tsm mirroring vs pprc
>
>
> 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 prefer TSM mirroring.  We had planned to implement TSM mirroring
> with a copy of the database and recovery log on IBM ESS in both of the data
> centres.
>
> 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?
>
> Regards
> Richard.
>
> Richard Bates
> Storage Specialist
> ITS - SB - Enterprise Consultancy Services
> ==========================================
> Voice :  00 44  (0) 1926 462298  (HICOM : 662298)  (MOBEX : 270798)
> richard_bates AT uk.ibm DOT com
>
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