Replacing Multiple Drives - IBM DS3500 Installation, User's, And Maintenance Manual

v When a drive is ready for use, the green activity LED is lit and the amber status LED is off.
v If the amber status LED is lit and is not flashing, remove the drive from the unit and wait 70
seconds; then, install the drive again.
8. Make sure that the drive is shown in the Subsystem Management window.
Note: If you are replacing more than one drive, replace only one drive at a time.

Replacing multiple drives

This section provides guidelines for upgrading the drives in the storage subsystem. Read the software
documentation and this entire section to determine whether you should use this procedure, use a
modified version of this procedure, or use a different procedure that is provided by the operating system.
Note:
1. Instructions that are provided with the software supersede any instructions and information in this
document.
2. Use "Hard disk drive locations" on page A-1 to make sure that you replace the drives into the correct
bays.
Attention: After you remove a drive, wait 70 seconds to allow the drive to spin down before you
replace or reseat the drive. Failure to do so might cause unpredictable results.
There are two methods for upgrading drives:
v Replacing all the drives at the same time
This method requires that you back up the data on the affected drives and then turn off the DS3500
storage subsystem.
Attention: Turn off the DS3500 storage subsystem before you turn off the attached storage enclosures.
After you replace all the drives, you must reconfigure the new drives and restore data from backup.
See the procedure in "Replacing all drives at the same time" on page 5-18.
This is the safest way to exchange drives without losing data. However, this method might take a long
time to complete because of the backup, reconfiguration, and restoration processes. In addition, other
users are not able to use the storage subsystem (or any storage enclosures attached to the storage
subsystem) until you finish the procedure. You must use this method on RAID 0 logical drives.
v Replacing the drives one at a time
In this method, you manually fail each drive, replace it, and wait for the system to restore data to the
new drive before you install the next drive. After you install the new drives, you can configure them to
make the additional drive space available. See the procedure in "Replacing the drives one at a time" on
page 5-19.
Using this method, you can replace the drives while the storage enclosures and the DS3500 are
running, eliminating the downtime that is required if you replace all the drives at once. However, this
method is more risky because you can lose data if the drive restoration or storage subsystem
reconfiguration process fails. In addition, the reconstruction process might take a long time. This
method works only on redundant logical drives (RAID 1, 3, 5, or 6). You cannot use this method with
any drives that contains RAID 0 logical drives.
Consider backing up your data if you use this method. This safeguards your data if the restoration and
reconfiguration process fails or the new drive malfunctions.
The method that you use depends on the following considerations:
v Which method most closely matches the recommended drive upgrade procedure that is provided in
the operating-system or storage-management software documentation.
v Which RAID level is used on the affected drives (RAID 0 requires you to replace all the drives at the
same time).
Chapter 5. Replacing components
5-17