RE: Configuration of the SAN
- From: "Bruce McCartney" <bruce.mccartney@xxxxxxxxxxxxxxxxx>
- To: <lucdemanche@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Tue, 29 Mar 2005 10:07:16 -0700
Luc,
I have a system we set up exactly that way because we needed the redo
thoughput; wasting space was not a huge issue. The problem is these SAN arrays
don't come with smaller drives :)
It depends on requirement - have you got a feel for IO/s or any redo stats?
Even with this approach you can serialize on the internal emc write queue for a
single drive in the raid1 set unless it is striped. If you go with this
approach, have the emc drives set to use only the outer tracks which have a
higher thoughput...
Bruce
-----Original Message-----
From: "Luc Demanche"<lucdemanche@xxxxxxxxx>
Sent: 3/29/05 9:41:11 AM
To: "oracle-l@xxxxxxxxxxxxx"<oracle-l@xxxxxxxxxxxxx>
Subject: Configuration of the SAN
Hi,
We are trying to do a good configuration of our SAN.
Let's see that exemple.
EMC, with disk of 146G.
- one LUN of RAID-5 for data (4+1 disks = 534G)
- one LUN of RAID-5 for index (4+1 disks = 534G)
Here is my question, about redo logs
- one LUN of RAID-1 for redo group 1 (2 disks mirroired = 146G)
- one LUN of RAID-1 for redo group 2 (2 disks mirroired = 146G)
- one LUN of RAID-1 for my archived log files (2 disks mirroired = 146G)
I will have a filesystem of 146G to store my redo group of 2G .... what a
waste.
Same thing for my redo group 2 and my archived log files ...
What is your LUN configuration regardinf redo log groups and archived
log files ?
Thank you
--
Luc Demanche
Oracle DBA
(514) 867-9977
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