Re: Transaction logging.

Really looking forward to DAOS. Have to get all those clients upgraded
first.

Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com





From:
Chris Whisonant <chris.whisonant@xxxxxxxxx>
To:
"Lotus Domino on the iSeries / AS400" <domino400@xxxxxxxxxxxx>
Date:
06/01/2009 02:41 PM
Subject:
Re: Transaction logging.
Sent by:
domino400-bounces+rob=dekko.com@xxxxxxxxxxxx



You don't need to do anything different as long as your disk drives aren't
already experiencing usage/utilization problems. IIRC, Walter said you'll
see about a 3% hit by starting transaction logging, but you'll probably
recoup that once you setup DAOS and see the reduced I/O overhead that it
will likely bring.

---------------------------------------------------

Thanks,
Chris
Personal Blog: http://cwhisonant.blogspot.com
Work Blog: http://www.bleedyellow.com/blogs/lotusnut


On Mon, Jun 1, 2009 at 2:17 PM, <rob@xxxxxxxxx> wrote:

Went to an IBM & Partner intro to 8.5 last week. One of the new options
we may look at requires transaction logging be fired up. Most of the

time

when I hear about transaction logging it makes me think of something
primarily run in a lab or on a test machine. Because, they mention
keeping your data on one drive and your transaction logs on another

drive.

Well, my machine has ninety disk drives. All Raid 5 protected. Does

it

really make sense to put the transaction log on dedicated disk? On the

i

that would involve Auxiliary Storage Pools or ASPs. In theory I could
have two ASPs: Main data in one and transaction logging in the other. I
can't imagine it would take more than a few 70gb disks to do transaction
logging.
Raid sets smaller than 4 drives are known to have serious performance
implications. Technically you can do a 3 drive raid set, but unless the
customer is just migrating from a S/36 they will notice the performance
hit versus a 4 drive (or more) set.

Is this separate disk stuff recommended on a "real" os?
Do I need a full RAID set in an ASP?

Rob Berendt
--
Group Dekko Services, LLC
Dept 01.073
Dock 108
6928N 400E
Kendallville, IN 46755
http://www.dekko.com

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