RE: Configuration of the SAN

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_at_gmail.com>     Sent: 3/29/05 9:41:11 AM
    To: "oracle-l_at_freelists.org"<oracle-l_at_freelists.org>     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
    --
    http://www.freelists.org/webpage/oracle-l          

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