Re: RMAN Performance Maladies
- From: Naqi Mirza <naqimirza@xxxxxxxxx>
- To: Jared Still <jkstill@xxxxxxxxx>
- Date: Mon, 12 Feb 2007 21:58:47 -0800 (PST)
This is true (RAID5:READS), the strange thing , though, is there is also a
reporting server - which is not an entire clone of this database - but pretty
close to it.
If users are asked to disconnect from the reporting server (basically no load)
and a test backup is performed via rman - the throughput achieved is 50mb/s.
The storage (that houses the database) is configured in the same manner, also
uses RAID5. The backup is to the same tape drives. I understand the
significance of a number like 666, but whats up with 50.
Is it possible, though, when a large number of disks (100+) are part of a RAID5
configuration for the controllers involved to become bound with i/o requests?
Sorry , for the slight hijack of your thread Michael.
----- Original Message ----
From: Jared Still <jkstill@xxxxxxxxx>
To: naqimirza@xxxxxxxxx
Cc: MFontana@xxxxxxxxx; oracle-l@xxxxxxxxxxxxx
Sent: Tuesday, 13 February, 2007 5:02:08 AM
Subject: Re: RMAN Performance Maladies
On 2/12/07, Naqi Mirza <naqimirza@xxxxxxxxx> wrote:
The problem I witnessed at a certain site - never got resolved, the
site was also using RAID 5 - I suspected this as the culprit
I would not expect RAID5 to be a problem during backup, unless there is a
lot of write activity to the drives during that time.
--
Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist
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