HP P2000 G3 MSA System CLI Reference Guide 355
cache-parameter
Properties
Table 12
cache-parameter properties
Name
Type
Description
serial-number
string
If a volume is specified, its serial number.
volume-name
string
If a volume is specified, its name.
write-policy
string
If a volume is specified, its cache write policy.
•
write-back
: Write-back caching does not wait for data to be completely
written to disk before signaling the host that the write is complete. This is the
default and preferred setting for a fault-tolerant environment because it
improves the performance of write operations and throughput.
•
write-through
: Write-through caching significantly impacts performance
by waiting for data to be completely written to disk before signaling the host
that the write is complete. Use this setting only when operating in an
environment with low or no fault tolerance.
write-policy-
numeric
string
Numeric equivalents for
write-policy
values.
•
0: write-through
•
1: write-back
cache-
optimization
string
If a volume is specified, its cache optimization mode.
•
standard
: Optimizes cache for both sequential and random reads.
Appropriate for applications that read and write small files in random
order, such as transaction-based and database update applications. This is
the default.
cache-
optimization-
numeric
string
Numeric equivalents for
cache-optimization
values.
•
0: standard
read-ahead-size
string
If a volume is specified, its read-ahead cache setting.
•
Disabled
: Read-ahead caching is disabled.
•
Default
: One chunk for the first access in a sequential read and one stripe
for all subsequent accesses.
•
Maximum
: Maximum read-ahead size calculated by the controller.
•
64 KB
,
128 KB
,
256 KB
,
512 KB
,
1 MB
,
2 MB
,
4 MB
,
8 MB
,
16 MB
, or
32 MB
: Size selected by a user.
read-ahead-
size-numeric
string
Numeric equivalents for
read-ahead-size
values.
•
-1: Default
•
0: Disabled
•
65536: 64 KB
•
131072: 128 KB
•
262144: 256 KB
•
524288: 512 KB
•
1048576: 1 MB
•
2097152: 2 MB
•
4194304: 4 MB
•
8388608: 8 MB
•
16777216: 16 MB
•
33554432: 32 MB
•
-
2147483648: Maximum
Summary of Contents for P2000 G3
Page 1: ...HP P2000 G3 MSA System CLI Reference Guide Part number 500912 009 First edition February 2014 ...
Page 14: ...14 About this guide ...
Page 30: ...30 Categorical list of commands ...
Page 199: ...HP P2000 G3 MSA System CLI Reference Guide 199 See also set cache parameters show volumes ...
Page 294: ...294 Alphabetical list of commands See also set volume set vdisk ...
Page 498: ...498 XML API basetype properties PROPERTY name mrc version type uint8 0 PROPERTY OBJECT ...
Page 524: ...524 Glossary ...
Page 532: ...532 Index ...