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flarcreate / flash archive backup of root (that's SDS/metadevice)

Posted on 2008-10-04
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Hi,

I would like to take "flar create" of the root partition but "df -k" showed it's
an "/dev/md/..."  metadevice.

Would it work?  Any precautions when doing recovery/restore?

Suppose I destroy the root metadevice & just want to restore the flash
archive to a simple disk partition for booting up, would this work (I
don't mind losing the metadevice mirroring/RAID features & replace
with a simple disk partition)
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Question by:sunhux
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si_shamil earned 350 total points
ID: 22642540
A problem will occur when recovering operating systems that had been mounted as metadevices. This was because the image created included all the metadevice settings and configuration files. After the restore, all those settings and configuration files were still in the same places. If you do not remove them manually, you will have problems booting the machine.

To remove those metadevice entries, you can boot the machine from a CD, mount the root file system as /a, and then delete MDD root info and MDD database info in the /etc/system file. Also, delete the entries in /etc/lvm/md.cf and mddb.cf files.

it's preferable to remove the metadevice before you create the archive.
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by:sunhux
ID: 22643547
What about a Veritas encapsulated root - do you know how to do it.

This is what I have on one of our sun server (sorry I'm completely green to VxFs) :

df -k /
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/vx/dsk/rootvol  5043518 4711858  281225    95%    /


If I don't take "flar create", would taking ufsdump of root make things easier for
root metadevices (or VxFs encapsulated root)?     So in the event disk crashed
during relocation, we simply mount the replaced disk (without the VxFs or SDS),
do "ufsrestore" & then do "installboot from the CD" - can't remember the full
installboot command but appreciate if anyone can provide me here

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by:si_shamil
ID: 22643559
I don't think that ufsdump/ufsrestore will do the job here, these utilities intended to backup files to the whole system.
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Author Comment

by:sunhux
ID: 22643882
You may want  to read the link below & give me your views again :

www.sunmanagers.org/pipermail/sunmanagers/2001-June/004650.html

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by:si_shamil
ID: 22643914
I never did this kind of imaging with ufsdump. But it looks like from the link that it will work.
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