Veritas: Basics

Remove a disk (oracle21) from a disk group (oracle):

vxdg -g oracle rmdisk oracle21

Add that disk back into the disk group with the old disk name (can use any though):

vxdg -g oracle adddisk oracle21=c4t0d123 (the s2 is there by default, and can be added/changed)

Great Veritas VM resource:

vxintro

Great vxassist resource:

vxassist -H; great vxassist help

Create a new disk group (jeff) by creating/adding 1 disk (jeff01) to it:

vxdg init jeff jeff01=c4t0d123

Make a 5 gig volume on that disk group:

vxassist -g jeff make jvol 5g

Start/stop a volume:

vxvol -g jeff start jvol
vxvol -g jeff stop jvol

Remove a volume (jvol):

vxassist -g jeff remove volume jvol

Make a vxfs filesystem on a volume, taking up the entire volume:

mkfs -F vxfs /the/raw/device

Grow a volume & filesystem at the same time to a new size of 20 gigs:

vxresize -F vxfs -g jeff jvol 20g

*Note: default filesystem (without -F) is dependent on /etc/default/fs
Destroy a disk group:

vxdg -g jeff destroy jeff

List all disk groups:

vxdg list

Look deeply at all disk groups and their devices:

vxprint -ht

Look at all veritas disks and their associated disk groups and OS disk names:

vxdisk list

Great menu for adding to a disk group or initializing or encapsulating filesystems into a disk group:

vxdiskadm

Add DRL (dirty region log) to a volume:

vxassist addlog volume

*note Used to cause mirrors to quickly resync after a crash or when you remove/replace a mirror. Must run "vxdctl start" before this will work

VXFS: Re-online a diskgroup with a missing disk

We lost a disk out of our Oracle disks, that was under Veritas control, due to a problem on the SAN. To get the volumes back off the missing disk we had to do the following:

1. Re-scan the system to pull back the missing disk:

devfsadm

2. See if the disk still contains valid information in the veritas private region. First grab the information, then pipe it through to see if the information is still valid:

vxprivutil dumpconfig /dev/rdsk/c6t1d0s3 > /tmp/out
cat /tmp/outvxprint -d - -ht

3. Restart the disk group to add back in the missing disk, then check to make sure the old disk is back in the group.

vxdg deport oracle
vxdg import oracle
vxdisk list

4. See if the volumes came back auto-magically, if so you are done otherwise continue:

vxprint -ht -g oracle

5. Re-initialize the private region of the missing disk, which we will write over later.

vxdisk -f init c6t1d0

6. Using the disk layout from the missing disk, collected in step 2, generate the information required to rebuild the missing volume(s). repeat for all missing volumes:

cat /tmp/outvxprint -D - -mpvsqQr u03 > /tmp/u03

7. Re-create the volume with the script(s) generated in step six:

vxmake -g oracle -d /tmp/u03

8. Verify that the volume(s) was actually made, if so start it:

vxprint -ht
vxvol -g oracle start u03

5. Fsck the disk(s) and then mount it up:

fsck -F vxfs /dev/vx/dsk/oracle/u03
mount -F vxfs /dev/vx/dsk/oracle/u03