From: Hannes Visagie (visageh@mtn.co.ug)
Date: Fri Jul 12 2002 - 04:54:55 EDT
Hi
Thanks to all that responded, and replied with further discussions on the
same issue.
There are limits of 12 RCS, and a RCS can only be applied to a non
PARTITIONED stripe/mirror/JBOD sets.
My DRM design will have to be redone. In a Oracle DRM, there are issues to
replicate only redo log files, or complete database. Compaq white papers
RF-1208-03, 15FA-0801A-WWEN.
Perhaps wait for next release. Investigating. A future DRM summary will be
posted.
Hannes
--- Replied ---
Yes it does. Only 12 units can be replicated
I'm pretty sure that it's unsupported to replicate partitioned units
Kevin Jones
-- The most current DRM Quick Spec clearly says: + Up to twelve remote copy sets per array + Up to twelve non-remote copy sets per array + Up to twelve remote or non-remote copy sets per association sets Raul Sossa -- I'm not looking at the manual, but I thought a RCS could have multiple LUNs associated with it. Thus you can have all the luns replicated, but the failure granularity is only 12 sets of LUNs. Greg Freemyer -- Correct. It is a severe restriction. ACS ?next? for DRM is due out in about December which removes (or greatly increases, I forget which) the restriction. However, some of the issue is controller hased, so the HSG80 may still have problems. Lots of other useful things -- bi-directional without having to buy extra controllers, etc. William H. Magill --- Original ------------------------------- Hi All Busy finalizing our DRM solution, but got to a peace of doc that states: Application Notes HSG80 ACS Version 8.4-4P Data Replication Manager Design Guide Part Number: AA-RQ78A-TE First edition (Feb. 2002) Page 16 Disaster-Tolerant LUNs A single DRM-based pair of storage arrays supports a max of 12 RCS's, where an RCS is a logical storage unit that is to be replicated to remote site. --- Our system has 18 LUNS, and perhaps more in future. Does this mean I can only replicate 12 of those ? The array supports 128 LUNS, but only 12 RCS's ??? Thanks in advance Hannes
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