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Important: Before the battery in the iTBBU can effectively protect from a
failure, it must be charged for at least six hours under normal operating
conditions. To protect your data, the firmware changes the Write Policy to
write-through
unit is sufficiently charged. When the battery unit is charged, the RAID
controller firmware changes the Write Policy to
of the performance benefits of data caching.
Table 3-12 Customer replacement part numbers
Customer replaceable unit (CRU)
part numbers
43W4283
43W4282
Note: After the iTBBU battery is attached to the ServeRAID-MR10k controller,
the battery must be charged for 24 hours at the first-time use to become fully
charged. This ensures the maximum usefulness of the Li-Ion battery.
While the battery is charging for the first time, the controller cache is disabled
and set to the
the
write-back
Installation guidelines
Consider the following guidelines when using RAID or installing the
ServeRAID MR10k:
No rewiring of the existing internal cabling is required when the
ServeRAID-MR10k is installed in an x3850 M2 or x3950 M2.
A RAID array created with the SAS LSI 1078 can be migrated for use with the
ServeRAID-MR10k, but the reverse is not possible.
This means that if you create RAID-0 (IS) and RAID-1 (IM) arrays using the
onboard LSI 1078 Integrated RAID controller, and later install a
ServeRAID-MR10k, you are given the option to convert those arrays to the
format used by the MR10k. However, if you want to later remove the MR10k,
you must first
inaccessible
132
Planning, Installing, and Managing the IBM System x3950 M2
(effectively bypassing the cache and battery) until the battery
write-through
(cache disabled) mode and is changed back to
(cache enabled) mode automatically.
save
all your data because the data in those arrays will be
by the LSI 1078 Integrated RAID controller.
write-back
to take advantage
Description
iTBBU battery package
ServeRAID MR10k adapter
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