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v How much downtime is acceptable as you swap the drives
v The number of drives in an array. Replacing drives one at a time is better suited
Replacing all drives at the same time
Use this procedure to replace all drives at the same time. You must use this method
if you are upgrading drives containing RAID 0 logical drives. All the data currently
on the drives is lost when you replace the drives; therefore, you must back up all
data that is currently on the drives. This procedure also requires you to turn off the
storage server, which makes the storage server (and any attached expansion units)
inaccessible to other users.
To replace all the drives at the same time, perform the following steps:
74
IBM TotalStorage FAStT100 Storage Server: Installation, User's, and Maintenance Guide
for arrays consisting of 3 to 5 drives. If you have more than 20 drives, consider
replacing all drives at the same time.
1. Read the following information:
v The information in "Adding larger-capacity drives" on page 73, particularly
the paragraphs that discuss the differences between the two possible
upgrade procedures
v The information in your software documentation regarding drive upgrades
and installation
v The documentation that comes with the new drives
Read all precautionary notes, kit instructions, and other information. Kit
instructions often contain the most current information regarding the drives
and their installation, plus upgrade or servicing procedures. Compare the kit
instructions with this procedure to determine if you need to modify this
procedure.
2. Use the Storage Manager client to check the status of the storage server.
Correct any problems that are reported.
3. Perform a complete backup of the drives that you are replacing.
You need the backup to restore data on the drives later in this procedure.
Attention:
When you handle static-sensitive devices, take precautions to
avoid damage from static electricity. For details about handling static-sensitive
devices, see "Handling static-sensitive devices" on page 69.
4. Unpack the new drives.
Set the drives on a dry, level surface away from magnetic fields. Save the
packing material and documentation in case you need to return the drives.
5. Perform the following steps:
a. Stop all I/O activity to the storage server and attached expansion units.
Make sure that:
1) All of the green Drive activity LEDs on the front of the storage server
(and on all attached expansion units) are not flashing.
2) The green Cache active LEDs are off on the front of the RAID
controllers.
b. If applicable, use the operating system software to disconnect the storage
server logical drives from the host before you power off the storage server.
Attention:
To turn off all power to the storage server, you must turn off both
power-supply switches and disconnect both power cords. Use the procedure in
step 6 for the proper shutdown sequence.
6. Turn off the power to each device based on the following shutdown sequence:
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