Re: VOL Shadow an mounted drive

From: Denny Rich (denny.rich_at_swagelok.com)
Date: 03/04/04 

Date: 4 Mar 2004 13:35:39 -0800

John,

No, you cannot convert a mounted disk into a shadow disk.

Yes, you will have to FIRST dismount the physical disks. Then,
carefully and surely backup one of these disks because its data will
be destroyed. Lets say you want to mount $1$DGA1000 (label=XXX00), and
will copy dga1001 to tape:

1. dismount $1$dga1000

2. backup to tape $1$dga1001

3. $ mount/system dsa1000:/shadow=$1$dga1000 XXX00 XXX00

4. when the backup to tape is finished, you can add in the other disk:
   $ mount/system dsa1000:/shadow=$1$dga1001 XXX00 XXX00

5. $ mount/cluster dsa1000:/shadow=($1$dga1000,$1$dga1001) XXX00 XXX00
   will then make everything visible to all clustered nodes.

IIRC, step 3 is required the **first** time DSA1000 is ever mounted.
AFter that, you can use the command in step 5.

Also, I mount all my disks as shadow sets, even the single ones. This
way, If I ever want to move the app and data to a different spindle, I
just add in the new spindle, then take out the old spindle, then edit
my "system_mount" procedure so it all works at the next reboot.

regards,

denny

brandon@dalsemi.com (John Brandon) wrote in message news:<04030318132800@dscis6-0.dalsemi.com>...
> I was wondering if it is possible to volume shadow (software) a mounted disk
> drive without having to dismount and then mount it as a shadow set.
>
> For example:
>
> $ SHOW DEV DGA1000
>
> Device Device Error Volume Free Trans Mnt
> Name Status Count Label Blocks Count Cnt
> $1$DGA1000: (MYNODE) Mounted 0 XXX00 8001945 4 2
>
> $ SHOW DEV DGA1001
>
> Device Device Error Volume Free Trans Mnt
> Name Status Count Label Blocks Count Cnt
> $1$DGA1001: (MYNODE) Mounted 0 XXX01 8001945 4 2
>
>
> $ MOUNT DSA1: /SHADOW=($1$DGA1000:,$1$DGA1001:) YYY00 /SYSTEM
>
>
>
> I have not had the oppurtunity to test this yet, however I am assuming that I
> can not do this - that I have to dismount the physical devices first.
>
> I am thinking about doing this because I want to do some snapshot (sort of)
> backup.
> TIA
>
>
> J*o*h*n B*r*a*n*d*o*n
> VMS Systems Administrator
> firstname.lastname.spam.me.not@dalsemi.com

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