From: Steven Lembark <lembark@wrkhors.com>
To: linux-lvm@sistina.com
Subject: Re: [linux-lvm] HUGE LVM log file...
Date: Wed, 18 Jul 2001 12:02:32 -0500 [thread overview]
Message-ID: <476390000.995475752@dizzy> (raw)
In-Reply-To: <5.0.2.1.2.20010718104547.00a40ec0@193.0.0.208>
> In AIX, the system create PPS (PE) from the middle of the disk for
> performance reasons.
And systematically fry their performance in some cases.
The theory behind middle-tracks is reducing butterfly reads.
Eventually, however, the drive gets full and you end up with
butterflys anyway.
With newer (last 5 years+) drives the outer cyl's have more
sectors to keep the bit density constant. This leaves you with
much more storate at the outside edge, which reduces seeks
which is faster (especially since at least SCSI drives normally
do cyl buffering).
For even finer control you can create fast/med/slow part's
on the drive and then use them as PV's in different VG's.
Used carefully this can be a serious performance boost for
high-I/O systems.
sl
next prev parent reply other threads:[~2001-07-18 17:02 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-07-17 21:52 [linux-lvm] HUGE LVM log file Gonyou, Austin
2001-07-18 0:00 ` Wolfgang Weisselberg
2001-07-18 8:22 ` Joe Thornber
2001-07-18 8:48 ` Benoit SERRA
2001-07-18 9:33 ` Joe Thornber
2001-07-18 19:23 ` Ragnar Kjørstad
2001-07-18 22:22 ` lembark
2001-07-18 9:46 ` Adam Cioccarelli
[not found] ` <Pine.LNX.4.33.0107181141480.25686-100000@vie-ac.office.ece tra.com>
2001-07-18 9:47 ` Benoit SERRA
2001-07-18 10:48 ` [linux-lvm] what happens when hdX get hdY in a VG Oliver Jovic
2001-07-18 10:59 ` Joe Thornber
2001-07-18 13:29 ` [linux-lvm] HUGE LVM log file Iain Campbell
2001-07-18 17:02 ` Steven Lembark [this message]
-- strict thread matches above, loose matches on Subject: below --
2001-07-17 11:13 Guennadi Liakhovetski
2001-07-17 11:14 ` Heinz J. Mauelshagen
2001-07-17 11:28 ` Guennadi Liakhovetski
2001-07-17 11:28 ` Heinz J. Mauelshagen
2001-07-17 21:28 ` Wolfgang Weisselberg
2001-07-18 14:55 ` Heinz J. Mauelshagen
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