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 using PPRC "mirroring"
as it might not be exactly what they like to have in real life, we are using
it on a number of systems (not for TSM)and there is some more to it then
what might be obvious.
Regards,
Jan Norback
Atos Origin-IT (MS/DS/OSS Unix)
VA-173, PO-box 218, 5600 MD Eindhoven, The Netherlands
Groenewoudseweg 1 5621 BA Eindhoven, The Netherlands
Email: [EMAIL PROTECTED]
Tel: +31 (0)40-2780289
Mobile: +31 (0)6-12994492
Fax : +31 40 2783962
-----Original Message-----
From: Richard Bates [mailto:[EMAIL PROTECTED]]
Sent: Friday, June 08, 2001 1:25 PM
To: [EMAIL PROTECTED]
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
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