Fujitsu ETERNUS DX100 S4 Design Manual page 60

2. Basic Functions
Optimization of Volume Configurations
LDE may not be available when other functions are being used in the ETERNUS DX or the target
RAID group.
For details on the functions that can be executed simultaneously and the number of the process
that can be processed simultaneously, refer to
Simultaneous Executions" (page
If drives of different capacities exist in a RAID group that is to be expanded while adding drives,
•
the smallest capacity becomes the standard for the RAID group after expansion, and all other
drives are regarded as having the same capacity as the smallest drive. In this case, the remain-
ing drive space is not used.
- If drives of different rotational speeds exist in a RAID group, the access performance of the
RAID group is reduced by the slower drives.
- Using the same interface speed is recommended when using SSDs.
When installing SSDs in high-density drive enclosures, using SSDs that have the same drive
-
enclosure transfer speed is recommended.
Since the data cannot be recovered after the failure of LDE, back up all the data of the volumes
•
in the target RAID group to another area before performing LDE.
If configuring RAID groups with Advanced Format drives, the write performance may be re-
•
duced when accessing volumes created in the relevant RAID group from an OS or an applica-
tion that does not support Advanced Format.
If the firmware version of the storage system is earlier than V10L88-6000 or earlier than
•
V10L89-6000, an error may occur due to a Flexible Write Through action while LDE is running
(*1). Before executing LDE, set "Flexible Write Through" to "Disable" with the "Setup Subsystem
Parameters" function.
*1 : When using the controller firmware for the China region, this applies to controller firm-
ware versions earlier than V10L88-9006 or earlier than V10L89-9006.
Fujitsu Storage ETERNUS DX100 S4/DX200 S4, ETERNUS DX100 S3/DX200 S3 Hybrid Storage Systems Design Guide (Basic)
"Combinations of Functions That Are Available for
203).
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