Chapter 1 System Management
1.4 System Management
ETERNUS Web GUI User’s Guide (Settings)
Copyright 2015 FUJITSU LIMITED
P2X0-1270-13ENZ0
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1.4.9
Setup Extreme Cache
This function is used to perform the following operations for Extreme Cache.
•
Select the cache to be used (Extreme Cache (EXC) or Extreme Cache Pool (EXCP))
•
Set the cache memory size to use as EXC (when "Extreme Cache" is selected)
•
Set the cache memory size to use as EXCP (when "Extreme Cache Pool" is selected)
•
Set the tuning parameters
To use an EXC, PCIe Flash Modules (PFMs) installed in the CM are required.
To use an EXCP, SSDs installed in the CE or DE are required.
•
PFMs can be installed in the ETERNUS DX500 S3/DX600 S3 and the ETERNUS DX8700 S3/DX8900 S3.
•
The available operations with this function depend on the installation status of the PFMs. For the
ETERNUS DX500 S3/DX600 S3, the same number of PFMs must be installed in each CM. Refer to
"Availability of the EXC setting according to the number of installed PFMs" (page 683)
for details.
•
SSD SEDs cannot be used for EXCPs.
•
EXC or EXCP cannot be enabled under the following conditions:
-
The storage system status is "Not Ready"
-
Pinned data exists in the ETERNUS DX
-
A CM that is not in "
Normal" status exists
-
A PFM that is not in "
Normal" or "
Warning" status exists (when "Extreme Cache" is selected)
•
If an EXCP includes a RAID group without an "
Available" status, the setting values and set state of the
tuning parameter cannot be changed. (When "Extreme Cache Pool" is selected)
•
Note the following points:
-
The cache to be used, the memory size, and the tuning parameters can be changed during business
operations.
-
When "Not Used" is selected for "Cache Used", the cache memory size for EXC or EXCP changes to "0
GB".
-
The selected state of the "Cache Used" (the set state of EXC for the ETERNUS DX), and the set states of
EXC and EXCP for each volume do not cooperate. Regardless of the selected state of the "Cache Used",
the default state of EXC and EXCP for each volume is "Enable".
-
EXC and EXCP for each volume is not changed regardless of whether "Cache Used" is changed by using
this function.
-
The current EXC or EXCP setting can be checked. Refer to "System Settings" in "ETERNUS Web GUI User's
Guide (Operation)" for details.
-
The cache hit rate of EXC or EXCP for each volume can be checked in the [Performance Information]
screen. Refer to "Performance (Host I/O)" or "Performance (Advanced Copy)" in "ETERNUS Web GUI
User's Guide (Operation)" for details.
Summary of Contents for Eternus DX200F
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