Setup Exclusive Read Cache - Fujitsu ETERNUS DX60 S3 User Manual

Chapter 1 System Management
1.4 System Management
• The RAID group capacity that is configured with selected SSDs is displayed in the "Memory Size"
field.
"0GB" is displayed when no SSD is selected. When the maximum number of SSDs has already been
selected, a "-" (hyphen) is displayed.
The number of selectable SSDs is described below:
-
-
-
Refer to
• For the EXCP memory size, the value assumed that "1TB = 1000GB" is displayed.
8
Click the [OK] button.
 The EXC setting starts.
9
Click the [Done] button to return to the [System Settings] screen.
1.4.10

Setup Exclusive Read Cache

This function sets the ratio for an exclusive read cache area in the CM cache memory.
By setting the exclusive read cache area, the read I/O performance may be maintained regardless of the write
I/O when the ETERNUS DX is in a high-load state.
• If exclusive read cache is specified, the I/O performance may be reduced depending on the operating
environment. Do not change the default setting ("0%") for normal use.
• Using this function when the ETERNUS DX load is low is recommended. This function can be used during
system operations, but the cache mode is temporarily changed to "Write Through Mode" during a config-
uration.
• The same exclusive read cache area size is secured in all CMs.
• If "0%" is set for "Exclusive Read Cache" or if the calculated value is less than "64MB", "64MB" is secured for
each CM.
For details on the parameters for this function, refer to
For the factory default settings for this function, refer to
ETERNUS DX100 S3/DX200 S3
1 (0GB/400GB)
ETERNUS DX500 S3/DX600 S3
1 - 4 (0GB/400GB/800GB/1200GB/1600GB)
ETERNUS DX8700 S3/DX8900 S3
1 - 4 (0GB/400GB/800GB/1200GB/1600GB)
"Available EXCP memory size" (page 684)
ETERNUS Web GUI User's Guide (Settings)
Copyright 2015 FUJITSU LIMITED
for details.
"A.1.3.9 Setup Exclusive Read Cache" (page
"Appendix B Setup Exclusive Read Cache" (page
59
End of procedure
688).
975).
P2X0-1270-13ENZ0