From: Alasdair G Kergon <agk@uk.sistina.com>
To: linux-lvm@sistina.com
Subject: Re: [linux-lvm] 2 LVM questions - LVM and 2.4.19, and extent based striping.
Date: Tue Nov 26 15:52:04 2002 [thread overview]
Message-ID: <20021126213244.D6509@uk.sistina.com> (raw)
In-Reply-To: <OFB3E6E776.74CCEE3A-ON85256C7D.0055BB76@LocalDomain>; from GBanschbach@sandata.com on Tue, Nov 26, 2002 at 02:14:29PM -0500
On Tue, Nov 26, 2002 at 02:14:29PM -0500, GBanschbach@sandata.com wrote:
> In the linux LVM world, we can't seem to do this...... We get stripes
> WITHIN extents, but the extents are still visited serially:
> 1st 64k on Log. Ext Zero which is Physical Zero on disk1. The 2nd is on
> LE 1 on disk 1.
I don't think it's *supposed* to be doing that.
Have you confirmed this by examining the actual contents of the disks?
If you have 18 extents (PEs) with 6 on each disk numbered:
disk1: 0 1 2 3 4 5
disk2: 6 7 8 9 10 11
disk3: 12 13 14 15 16 17
and the stripesize is 64k, I think it should write the first 64k of
the LV to disk1 (PE 0), the second 64k to the start of disk2 (PE 6)
the third 64k to the start of disk3 (PE 12) and then the fourth 64k
to PE 0 again etc.
Alasdair
--
agk@uk.sistina.com
next prev parent reply other threads:[~2002-11-26 15:52 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-26 13:15 [linux-lvm] 2 LVM questions - LVM and 2.4.19, and extent based striping GBanschbach
2002-11-26 15:52 ` Alasdair G Kergon [this message]
2002-11-26 16:28 ` Alasdair G Kergon
2002-11-27 11:23 ` Heinz J . Mauelshagen
2002-11-27 11:28 ` Heinz J . Mauelshagen
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