From: Axel Reinhold <axel@freakout.de>
To: linux-lvm@sistina.com
Subject: Re: [linux-lvm] LVM2 migration on 2.4.24 troubles - prepare for 2.6
Date: Tue Jan 20 17:06:01 2004 [thread overview]
Message-ID: <200401201848.i0KIm9iW017304@bongo.freakout.de> (raw)
In-Reply-To: <20040119171824.S18942@uk.sistina.com> from Alasdair G Kergon at "Jan 19, 2004 05:18:24 pm"
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According to Alasdair G Kergon:
> On Sat, Jan 17, 2004 at 10:06:11PM +0100, Axel Reinhold wrote:
> > Are there incompatibilities regarding snapshots with LVM1/2?
>
> Yes - snapshots are implemented differently: the on-disk data
> is different.
>
> Always drop snapshots before switching between LVM1 / LVM2.
>
Dear Alasdair,
thanks for your answer. I use snapshots intensively. I
currently have 6 monthly, 5 weekly and 7 daily snapshots active
with a rotating algorithm.
Does the new implementation copy dirty blocks also in "all"
active snapshots or is it now possible to use the cow-blocks
"cross-snapshot"? I mean that a new dirty block is only copied
into the oldest snapshot and all the other ones can use that one.
NetApp's Filer does it this way.
Regards
Axel Reinhold
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prev parent reply other threads:[~2004-01-20 17:06 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-01-19 12:11 [linux-lvm] LVM2 migration on 2.4.24 troubles - prepare for 2.6 Axel Reinhold
2004-01-19 12:19 ` Alasdair G Kergon
2004-01-20 17:06 ` Axel Reinhold [this message]
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