Re: Volume shadowing between FC Storage at different sites, and the allocation class
From: Lee (lytmah_at_telusplanet.net)
Date: 06/29/04
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Date: Tue, 29 Jun 2004 13:04:43 GMT
I have done multiple tests on these disks across a multi-site cluster.
I was able to shadow $1$DGA disks with Storageworks $2$DUA
disks (with the same number of blocks of course) with no problems.
There was no difference in functionality of the two types of
physical disks or the mix of shadow sets created.
Be warned that under current 7.3-1 VMS, any $1$/$1$ or $1$/$2$
shadow sets you create will undergo long shadow merges
(5-12 hours) if any of your cluster nodes reboots or hiccups.
Andrew Rycroft wrote:
> Hi,
>
> I have just connected to some Fibrechannel based storage from my VMS
> system. I see all the devices as $1$DGAxxx. Even thought the ALLOCLASS
> parameter is 6 for the system.
>
> This system will be in a cluster with a system at a remote site also
> connected to FC storage, and I am sure I will also see the devices as
> $1$DGAxxx.
>
> I want to use Volume Shadowing to mirror the two sites, but I am a bit
> concerned that because the allocation class is 1 for fibre channel
> storage at both sites this may cause confusion for the cluster
> software.
>
> If anybody else has done this or has suggestions I would appreciate
> the feedback.
>
> With regards
> Andrew
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