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From: Sander Smeenk <ssm+lvm@freshdot.net>
To: linux-lvm@redhat.com
Subject: Re: [linux-lvm] Performance impact of LVM
Date: Mon, 31 Jul 2006 09:58:46 +0200	[thread overview]
Message-ID: <20060731075846.GA32150@freshdot.net> (raw)
In-Reply-To: <Pine.LNX.4.64.0607280846060.6888@mhw.ulib.iupui.edu>

Quoting Mark H. Wood (mwood@IUPUI.Edu):

> Some uses of LVM *could* increase I/O wait time.  It's easy to paste new 
> extents onto existing volumes, and the new extent probably won't be 
> contiguous with the old one.  So you *could* see longer average seek 
> delays due to additional arm travel distance between extents.  It's 
> strongly dependent on access patterns.

Hmm. Yeah, this setup i'm using was created and thereafter never changed
(yet). So i guess it should all still be contiguous...

Thanks for the info though. I'll see if i can do some tests when i get
my new hardware to play with. But as said before, it's probably not even
measurable. The added latency that is...

Thanks!
Sander.
-- 
| The older you get, the better you realize you were.
| 1024D/08CEC94D - 34B3 3314 B146 E13C 70C8  9BDB D463 7E41 08CE C94D

  parent reply	other threads:[~2006-07-31  7:58 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2006-07-27 12:02 [linux-lvm] Performance impact of LVM Sander Smeenk
2006-07-27 15:30 ` Dieter Stüken
2006-07-28  7:09   ` Sander Smeenk
2006-07-28 12:54   ` Mark H. Wood
2006-07-28 14:22     ` Michael T. Babcock
2006-07-31  7:58     ` Sander Smeenk [this message]
2006-07-27 17:14 ` Lamont R. Peterson
2006-07-28  7:24   ` Sander Smeenk

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