Table of Contents
Advertisement
8. Use the DS4000 Storage Manager subsystem management window to verify
Replacing multiple EV-DDMs
This section provides guidelines for upgrading the EV-DDMs in the storage
subsystem. Read the software documentation and this entire section to determine if
you should use this procedure, use a modified version of this procedure, or use a
different procedure that is provided by your operating system.
Note: Instructions that are provided with your software should supersede anything
Attention:
or reseating the EV-DDM CRU to allow it to properly spin down. Failure to do so
may cause undesired events.
There following are two methods for upgrading drives:
v Replacing all the EV-DDMs at the same time
v Replacing the EV-DDMs one at a time
The method you use depends on the following considerations:
Attention:
After you remove a EV-DDM CRU, wait 70 seconds before
replacing or reseating the EV-DDM CRU to allow it to properly spin down.
Failure to do so may cause undesired events.
that the EV-DDM is shown in the Storage Subsystem Management window.
stated in this document.
After you remove a EV-DDM CRU, wait 70 seconds before replacing
This method requires that you back up the data on the affected EV-DDMs and
then turn off the DS4200 Express storage subsystem.
Attention:
Turn off the DS4200 Express storage subsystem before you turn off
the attached storage expansion enclosures.
After replacing all the EV-DDMs, you must reconfigure them and restore data
from backup. See the procedure in "Replacing all EV-DDMs at the same time" on
page 116.
This is the safest way to exchange EV-DDMs 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 expansion enclosures attached to
the storage subsystem) until you finish the procedure. You must use this method
on RAID 0 logical drives.
In this method, you manually fail each EV-DDM, replace it, and wait for the
system to restore data to the new EV-DDM before installing the next EV-DDM.
After you install the new EV-DDMs, you can configure them to make the
additional drive space available. See the procedure in "Replacing the EV-DDMs
one at a time" on page 118.
Using this method, you can replace the EV-DDMs while the storage expansion
enclosures and the DS4200 Express are running, eliminating the down time that
is required if you replace all the EV-DDMs 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, or 5).
You cannot use this method with any drives containing 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.
Chapter 5. Replacing components
115
Advertisement
Table of Contents
