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List:       opensolaris-ufs-discuss
Subject:    [ufs-discuss] SVM synchronization order
From:       Truong.Q.Nguyen () Sun ! COM (Tony Nguyen)
Date:       2005-08-08 10:59:16
Message-ID: 42F799DC.5090306 () Sun ! COM
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Frank Batschulat wrote:
> On Wed, 03 Aug 2005 16:02:26 +0200, Matty <matty91@gmail.com> wrote:
> 
>>
>> When a system boots from a mirrored meta device, does it always sync  
>> from the lowest submirror (e.g., Submirror 0) to the highest 
>> submirror  (e.g., Submirror 1)? Is there a way to force a 
>> resynchronization from  the highest Submirror to the lowest Submirror 
>> (this would be helpful  when you trash the primary mirror when booted 
>> from CDROM, and don't want  to corrupt the working mirror when you 
>> reboot). I usually control this  my moving RC scripts and booting from 
>> the secondary mirror, but wanted  to see what other methods existed. 
>> The section "RAID-1 Volume (Mirror)  Resynchronization" on 
>> docs.sun.com doesn't seem to address this specific  scenario:
>>
>> http://docs.sun.com/app/docs/doc/816-4520/6manpiejc?a=view
> 
> 
> this question is far better answered by the SVM folks on the
> LVM discussion list:
> 
> http://www.opensolaris.org/jive/forum.jspa?forumID=16
> 
> lvm-discuss@opensolaris.org
> 
> ---
> frankB
> _______________________________________________
> ufs-discuss mailing list
> ufs-discuss@opensolaris.org

What do you mean by 'trashing the mirror when booting from the CD-ROM'? 
I'm guessing you mean trashing(writing to) the first submirror/boot 
device. Clarifications on this will help us better answer your 
questions. Some information on

There's no way for a user to specify which submirror the resync will get 
data from.  However, in your case, a good workaround, similar to what 
you've done is:
- detach the primary mirror before booting from the CD-ROM (you also 
need to change the default boot device in either the BIOS or eeprom).
- after trashing the old primary boot device, reboot using the remaining 
submirror.
- attach the old submirror to the mirror to sync its data.

-tony

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