198 Alphabetical list of commands
Cache Write Policy
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.
Cache Optimization
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.
Read Ahead Size
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.
Example
Show the cache parameters for the system and for volume
V1
:
# show cache-parameters V1
System Cache Parameters
-----------------------
Operation Mode: Active-Active ULP
Controller A Cache Parameters
-----------------------------
Write Back Status: Enabled
CompactFlash Status: Installed
Cache Flush: Enabled
Controller B Cache Parameters
-----------------------------
Write Back Status: Enabled
CompactFlash Status: Installed
Cache Flush: Enabled
Volume Cache Parameters
-----------------------
Serial Number:
SN
Name: V1
Cache Write Policy: write-back
Cache Optimization: standard
Read Ahead Size: Default
Success: Command completed successfully. (2012-01-18 14:31:19)
Basetypes
•
cache-settings
•
cache-parameter
•
status
Содержание P2000 G3
Страница 1: ...HP P2000 G3 MSA System CLI Reference Guide Part number 500912 009 First edition February 2014 ...
Страница 14: ...14 About this guide ...
Страница 30: ...30 Categorical list of commands ...
Страница 96: ...96 Alphabetical list of commands exit Description Log off and exit the CLI session Syntax exit ...
Страница 159: ...HP P2000 G3 MSA System CLI Reference Guide 159 See also set host parameters show iscsi parameters ...
Страница 199: ...HP P2000 G3 MSA System CLI Reference Guide 199 See also set cache parameters show volumes ...
Страница 217: ...HP P2000 G3 MSA System CLI Reference Guide 217 Basetypes drives enclosure list status See also show vdisks ...
Страница 223: ...HP P2000 G3 MSA System CLI Reference Guide 223 Basetypes email parameters status See also set email parameters ...
Страница 230: ...230 Alphabetical list of commands See also clear events set snmp parameters show snmp parameters ...
Страница 288: ...288 Alphabetical list of commands Basetypes snapshots status See also show master volumes show snap pools ...
Страница 292: ...292 Alphabetical list of commands Basetypes system unhealthy component status See also set system ...
Страница 294: ...294 Alphabetical list of commands See also set volume set vdisk ...
Страница 338: ...338 Alphabetical list of commands Basetypes remote links See also show remote systems verify remote link ...
Страница 340: ...340 Alphabetical list of commands Basetypes remote links See also show remote systems verify links ...
Страница 424: ...424 XML API basetype properties PROPERTY name utility priority numeric type string 0 PROPERTY OBJECT ...
Страница 469: ...HP P2000 G3 MSA System CLI Reference Guide 469 PROPERTY name status type string OK PROPERTY OBJECT ...
Страница 494: ...494 XML API basetype properties PROPERTY name sample time numeric type string 1329397200 PROPERTY OBJECT ...
Страница 498: ...498 XML API basetype properties PROPERTY name mrc version type uint8 0 PROPERTY OBJECT ...
Страница 510: ...510 XML API basetype properties PROPERTY name reserve type numeric type string 0 PROPERTY OBJECT ...
Страница 524: ...524 Glossary ...
Страница 532: ...532 Index ...