Re: JFS2 - Part Deux

Just to add to the mix, I agree totally. These days, the only "physical disks" I have on my systems are the two mirrored rootvg disks; all of the other disks are redundant fibre-attached storage provided by a mix of FC and ATA disks in EMC storage arrays, carved into different RAID sets, and fronted by a bunch of memory cache in the array.

The concept of "physical spindle location" is meaningless in such an environment, I think.

-s-

On Jan 31, 2007, at 11:44 AM, Enrique Sanchez Vela wrote:

Jeff,

I would agree with you but now hdisks, or should I say
"Physical Volumes from AIX prespective", are more
loosely related to physical disks than ever. so having
the inline log in the same physical volume would be
spread across multiple physical hard drives and might
not impact as much.

I believe that inline log would give you an advantage
over the more traditional jfs2log on a recovery
situation where you need to run a fsck on multiple
large filesystems sharing the same jfs2log (if they
are sharing the log).

I am not sure about this, since AIX might perform a
serialized fsck as it finds the filesystems in
/etc/filesystems whether you use inline, multiple
jfs2log or not.

I have not run any tests.

regards,
enrique.





--- Jeff Barratt-McCartney <jbarratt@xxxxxxxxxxx>
wrote:


i dont normally use inline logs, as they dont afford
you the opportunity to modify disk placement of logs
for performance

-----Original Message-----
From: IBM AIX Discussion List on behalf of Mark
Schlechte
Sent: Wed 1/31/2007 9:44 AM
To: aix-l@xxxxxxxxxxxxx
Subject: JFS2 - Part Deux


With the discussion about jfs2 I decided it was a
good time to post my question about Inline logs and
jfs2.
We still run 4.3.3 systems but I do have a couple of
5.2 servers so when I have the opportunity I've done
a little bit of work with JFS2.
When I created some file systems recently I went
with jfs2 and chose inline log, mostly because I
didn't have a separate disk to use for that purpose.
Good? Bad? Depends on the workload characteristics?


I noticed Ku had mentioned Inline worked for him.


mark




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