IBM TotalStorage EXP100, Installation, User'S, And Maintenance Manual

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Table 8. New EXP100 expansion enclosure and existing EXP100 expansion enclosure
firmware compatibility (continued)
If the firmware version of the new EXP100
enclosure is:
Then you must ensure that the firmware in
the existing EXP100 expansion enclosures
in the drive loop is:
Notes:
1. If the new EXP100 ESM firmware version is not R1, you cannot add the new expansion
enclosure unless you first upgrade the existing ESMs to the same ESM firmware release
version (R2 or R3) of the new EXP100. See “Upgrading ESM firmware after adding the
EXP100 to an existing drive loop” on page 68 for more information.
2. You can add the EXP100 with R3 firmware into an existing drive loop that has the R2
firmware. However, you must do it only after you upgrade the controller firmware to the
R3 level. In addition, you must schedule the R2 to R3 ESM firmware upgrade at the
earliest time to ensure optimal operating conditions.
3. You can add the EXP100 with R2 firmware into an existing drive loop that has the R3
firmware. However, you must schedule the ESM and controller upgrade to the R3
firmware version at the earliest time to ensure optimal operating conditions.
4. If the new EXP100 with R1 ESMs and your drive loop already contains EXP100s with R2
or R3 ESMs, you cannot attach the new EXP100 to the drive loop. This is because you
cannot downgrade the R2 or R3 firmware in the existing DS4000 storage subsystem
controllers and EXP100 ESMs to the R1 level or upgrade the ESM firmware from the R1
to R3 (or R2) level with the controller firmware versions that support the R3 or R2
EXP100. If this is the case, contact IBM technical support, your IBM reseller, or your IBM
representative.
Perform the following steps before you add a new EXP100 expansion enclosure to
an existing EXP100 drive loop.
1. Use the procedure described in “Determining firmware levels” on page 11 to find
out the ESM firmware version of the existing EXP100 enclosure.
Note: Do not rely solely on the CRU part number of an already installed ESM
to determine the ESM firmware version, because the existing ESM
firmware might have been previously updated.
2. Determine the ESM firmware level of the ESMs in this EXP100 expansion
enclosure. There are two methods to determine the ESM firmware level. Use
either method (a) or method (b), as follows:
a. Use the CRU/FRU number on the ESM faceplate. When you open the
packaging box, you can verify the ESM firmware level of the new EXP100
expansion enclosure ESMs without removing the ESM CRUs from the
expansion enclosure. See Table 9:
Table 9. ESM firmware level by CRU part number
If the CRU part number is: Then the ESM firmware level is:
24P8814 EXP100 R1 ESM
25R0156 EXP100 R2 ESM
39M6004 EXP100 R3 ESM
b. Find the serial number on the EXP100 expansion enclosure packaging.
The serial number can help you to determine the ESM firmware version of
the new EXP100 expansion enclosure. See Table 10 on page 65:
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IBM TotalStorage DS4000 EXP100 Storage Expansion Enclosure: Installation, User’s and Maintenance Guide
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