ufsdump root slice

[dbase77]

Hi,

I have filesystem under veritas volume manager. The root disk is mirror. How do I go about using ufsdump command to take a backup of root partition? Let say:

pri-disk = c1t0d0s2
mir-disk = c1t1d0s2

Can I just use:
"ufsdump 0uf /dev/rmt/0cbn /dev/rdsk/c1t0d0s0"?

Or do I need to use veritas volume manager path eg. /dev/vx/dsk/rootvol

If the disk is mirror, do I need to take ufsdump on both disks or I can just use either one? I dont have to unmount / partition.

Thank you in advance.

regards,
dbase77

 

[cndcadams]

Check out this link, may be useful.

http://www.sun.com/bigadmin/content/submitted/disaster_recovery.html

Thanks

CA

 

[daFranze]

dbase77, Veritas Volume Manager boot's just like a System without VxVM or SDS; bootloader needs to find the kernel on a diskslice pointed to by OBP, the kernel loads, starts a lot of services etc. and mount's the filesystems according to vfstab (the metadevice or the veritasvolume)

If you know this, you can give yourself the answer: both and!
If you prefere to have a consistant backup (all files closed) I suggest to run a backup the following way:

- shutdown host
- boot cdrom
- ufsdump 0f /dev/rmt/0cn /dev/rdsk/c1t0d0s0

of you run online backups you better use .../rootvol

Regards
-- Franz
Sorry I'm not a native spaeker, I'm from Munich, Germany - "Home of the Whopper", oh no, "Home of the Oktoberfest" ;-)
Solaris System Manager; I used to work for Sun Microsystems Support (EMEA) for 5 years

 

[dbase77]

Hi,

Thanks for replying. My system need to be up 24/7. Im thinking of doing online backup for / partition. I will create a script and put into cronjob. And schedule during normal system load, example early in the morning around 1 AM.

You said if I do online backup, I better use rootvol. Why is that? Does it make any difference if I use
/dev/dsk/c1t0d0s0?

dbase77

 

[daFranze]

it does not realy make a difference but
- Veritas VM will do a loadbalancing
- it is "good style" to backup what is mounted

Regards
-- Franz
Sorry I'm not a native spaeker, I'm from Munich, Germany - "Home of the Whopper", oh no, "Home of the Oktoberfest" ;-)
Solaris System Manager; I used to work for Sun Microsystems Support (EMEA) for 5 years

 

[dbase77]

Hi,

OK. Thanks. If I want to restore to other machine, I just do the following:

- boot using cdrom
- make new filesystem
- mount filesystem
- cd mount_point
- ufsrestore rf /dev/rmt/0cbn

It doesnt matter from which device that I backup from the first place, right.

dbase77

 

[daFranze]

>> It doesnt matter from which device that I backup from the first place, right.

sorry I do not understand!? what does this mean?

restore to another machine:
yes, scenario is ok, but do not forget installboot -> man installboot
eeprom variable boot-device may not point to / (see Solaris command eeprom and OBP Command devalias)

Regards
-- Franz
Sorry I'm not a native spaeker, I'm from Munich, Germany - "Home of the Whopper", oh no, "Home of the Oktoberfest" ;-)
Solaris System Manager; I used to work for Sun Microsystems Support (EMEA) for 5 years

 

[dbase77]

Hi,

If I do online backup, I will use rootvol (/dev/vx/dsk/rootvol). But if I restore to other machine I'm going to use /dev/dsk/c1t0d0s0 before I can use veritas VM. Does it make any difference?

dbase77

 

[daFranze]

For the backup/restore itself it means no difference, but you may have problems starting the volumes whenever you do not habe a Veritas License on the other host...; you can edit /etc/vfstab and boot without Veritas Volumes...

Regards
-- Franz
Sorry I'm not a native spaeker, I'm from Munich, Germany - "Home of the Whopper", oh no, "Home of the Oktoberfest" ;-)
Solaris System Manager; I used to work for Sun Microsystems Support (EMEA) for 5 years