RE: DASD upgrade and start Mirroring

It does not look like you have RAID-1 or RAID-5 running at this time.
That is good for this job. What you need to do is get down below 70% so
you can remove one drive. There are steps that can be done to remove a
drive from service so the system will start pumping the data off. But
looking at replacing all the drive, I say two backups and restore from
tape. Doing one drive at a time will take days to accomplish and still
require down time to remove the drive you prep. It takes DST to get the
last part of the data off a drive, remove the drive. You can then add
the new drive and bring the system up. You should then be able to
remove two drive the next pass. Once you have the two new drives in
place, you would have to migrate the load source, more DST time. Label
the drive 1,2,3,4 and remove them, install the new drives, build the
raid set if you are going to, then boot from your save 21 tapes to
restore your entire system. If something goes wrong, reinstall the old
drive to the same slots and boot up, back to square 1.

Christopher Bipes
Information Services Director
CrossCheck, Inc.

-----Original Message-----
I bought 4 model 6818 17.54GB drives and a 2748 Raid controller. (I
installed the raid controller and noticed a big difference in the speed
of a disk intensive job I run every so often.)

I had a step by step list of how to install the DASD but I've lost it
and can't remember where I got it. The list came from a discussion
somewhere a few years back but I've googled and can't seem to find the
right combination of words.

I believe the write up said something about reducing the data on my disk
first if mirroring was going to be turned on.

I should be able to get the total down to under 50% on the existing
drives.
I've lots I can take off temporarily. QEJB lib contains about 400MB of
Save Files alone.

Where can I find the steps I need to follow?

The system is a model 170 V4R5 and I've included the following from work
with Disk Status.

Size %
Unit Type (M) Used
1 6607 4194 82.2
2 6607 4194 83.0
3 6607 4194 83.1
4 6607 4194 83.1