Fujitsu ETERNUS DX60 S3 - Create REC Disk Buffer

Chapter 7 Advanced Copy Management
7.8 REC Management
ETERNUS Web GUI User’s Guide (Settings)
Copyright 2015 FUJITSU LIMITED P2X0-1270-13ENZ0
645
7.8.7 Create REC Disk Buffer
This function creates an REC Disk Buffer.
When using the REC Consistency mode, REC Buffer shortage may occur due to errors (such as a bad line). Note
that the copy session status changes to " Halt" if the REC Buffer shortage extends past a certain period of
time. The REC Disk Buffer is used for temporarily saving copy data to avoid these situations.
Drive combinations that can configure an REC Disk Buffer
OK: REC Disk Buffers can be created
Not recommended: REC Disk Buffers can be created, but not a recommended configuration
NG: REC Disk Buffers cannot be created
*1: In the controller firmware versions V10L31 and earlier, "SED" indicates "Online SED".
• Registering the license for the Advanced Copy feature is required to create an REC Disk Buffer.
• This function can only be used when the local storage system (the storage system that creates REC Disk
Buffers) supports REC.
• When encryption mode is disabled, an encrypted REC Disk Buffer cannot be created by CM.
• In the following conditions, REC Disk Buffers cannot be created;
- When multiple types of drives are combined in a single REC Disk Buffer
Refer to "Drive combinations that can configure an REC Disk Buffer" (page 645)
for details.
- When resources for creating an REC Disk Buffer (such as the number of RAID groups and the number
of volumes) are insufficient
(When the maximum number of RAID groups or volumes is already registered in the ETERNUS DX, a
new REC Disk Buffer cannot be created.)
• When the REC Disk Buffer creation process is complete, the REC Disk Buffer will be formatted
automatically.
• When assigning multiple REC Disk Buffers to an REC Buffer, each REC Buffer has different conditions.
Refer to "7.8.8 Assign REC Disk Buffer" (page 649)
for details.
Online Nearline SSD Online SED Nearline SED SSD SED
Online
OK
Not
recommended
NG NG NG NG
Nearline
Not
recommended
OK NG NG NG NG
SSD NGNGOKNGNGNG
Online SED (*1)
NG NG NG OK
Not
recommended
NG
Nearline SED
NG NG NG
Not
recommended
OK NG
SSD SEDNGNGNGNGNGOK