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
==========================================
Voice :  00 44  (0) 1926 462298  (HICOM : 662298)  (MOBEX : 270798)
richard_bates AT uk.ibm DOT com


"Frost, Dave" <dave.frost AT TELEVAULTIT DOT COM> on 12-06-2001 11:50:54

Please respond to "ADSM: Dist Stor Manager" <ADSM-L AT VM.MARIST DOT EDU>

To:   ADSM-L AT VM.MARIST DOT EDU
cc:
Subject:  Re: tsm mirroring vs pprc




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-----