Advice, archive redo log apply to slow
- From: "George" <george@xxxxxxxxxxxx>
- To: oracle-l@xxxxxxxxxxxxx
- Date: Thu, 7 Dec 2006 15:00:46 +0200 (SAST)
Hi all.
ok this is a difficult one.
Production is a IBM p595 (Power 5) 32 cpu's
DR is a IBM 690 (Power 4) 32 cpu's
the hardware configuration is exactly the same other than for the 595 to 690.
both machines has 32 hba's (2 GB/ports) connecting to exactly the same lun
design, down to naming, number of spindles. spindle speeds etc, whats
located on the spindles, kernel parameters.
at the moment production can product 4000 archive redo log files per day,
DR can only apply 3000.
wierd thing is DR IO layers are all idling, this is the view from the
spindle performance, HBA's everything is idling, cpu's max usage is like
25%.
hwo can i dig deeper, how can i get DR to apply log files faster.
oh each log file is 250mb.
DR while applying log files say via nmon it is reading 10mb/sec. we have
shown we can do 10 times that easily.
thanks.
------------------------------------------------
George
george@xxxxxxxxxxxx
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