HP P2000 HP P2000 G3 MSA System SMU Reference Guide - Page 49

Configuring the EMP polling rate, Changing system cache settings, Changing the synchronize-cache mode - g3 drivers

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Configuring the EMP polling rate You can change the interval at which the storage system polls each attached enclosure's EMP for status changes. Typically you can use the default setting. • Increasing the interval might slightly improve processing efficiency, but changes in device status are communicated less frequently. For example, this increases the amount of time before LEDs are updated to reflect status changes. • Decreasing the interval slightly decreases processing efficiency, but changes in device status are communicated more frequently. For example, this decreases the amount of time before LEDs are updated to reflect status changes. To change the EMP polling rate 1. In the Configuration View panel, right-click the system and select Configuration > Advanced Settings > Disk. 2. Set the EMP Polling Rate interval. The default is 5 seconds. 3. Click Apply. Changing system cache settings Changing the synchronize-cache mode You can control how the storage system handles the SCSI SYNCHRONIZE CACHE command. Typically you can use the default setting. However, if the system has performance problems or problems writing to databases or other applications, contact technical support to determine if you should change this option. To change the synchronize-cache mode 1. In the Configuration View panel, right-click the system and select Configuration > Advanced Settings > Cache. 2. Set Sync Cache Mode to either: • Immediate. Good status is returned immediately and cache content is unchanged. This is the default. • Flush to Disk. Good status is returned only after all write-back data for the specified volume is flushed to disk. 3. Click Apply. Changing the missing LUN response Some operating systems do not look beyond LUN 0 if they do not find a LUN 0 or cannot handle noncontiguous LUNs. The Missing LUN Response option handles these situations by enabling the host drivers to continue probing for LUNs until they reach the LUN to which they have access. This option controls the SCSI sense data returned for volumes that are not accessible because they don't exist or have been hidden through volume mapping (this does not apply to volumes of offline vdisks). Use the default value unless a service technician asks you to change it to work around a host driver problem. To change the missing LUN response 1. In the Configuration View panel, right-click the system and select Configuration > Advanced Settings > Cache. 2. Set Missing LUN Response to either: • Not Ready. Sends a reply that there is a LUN where a gap has been created but that it's "not ready." Sense data returned is a Sense Key of 2h and an ASC/ASCQ of 04/03. This option is the default. • Illegal Request. Sends a reply that there is a LUN but that the request is "illegal." Sense data returned is a Sense Key of 5h and an ASC/ASCQ of 25/00. 3. Click Apply. HP P2000 G3 MSA System SMU Reference Guide 49

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HP P2000 G3 MSA System SMU Reference Guide
49
Configuring the EMP polling rate
You can change the interval at which the storage system polls each attached enclosure’s EMP for status
changes. Typically you can use the default setting.
•
Increasing the interval might slightly improve processing efficiency, but changes in device status are
communicated less frequently. For example, this increases the amount of time before LEDs are updated
to reflect status changes.
•
Decreasing the interval slightly decreases processing efficiency, but changes in device status are
communicated more frequently. For example, this decreases the amount of time before LEDs are
updated to reflect status changes.
To change the EMP polling rate
1.
In the Configuration View panel, right-click the system and select
Configuration > Advanced Settings >
Disk
.
2.
Set the EMP Polling Rate interval. The default is 5 seconds.
3.
Click
Apply
.
Changing system cache settings
Changing the synchronize-cache mode
You can control how the storage system handles the
SCSI SYNCHRONIZE CACHE
command. Typically you
can use the default setting. However, if the system has performance problems or problems writing to
databases or other applications, contact technical support to determine if you should change this option.
To change the synchronize-cache mode
1.
In the Configuration View panel, right-click the system and select
Configuration > Advanced Settings >
Cache
.
2.
Set
Sync Cache Mode
to either:
•
Immediate
. Good status is returned immediately and cache content is unchanged. This is the
default.
•
Flush to Disk
. Good status is returned only after all write-back data for the specified volume is
flushed to disk.
3.
Click
Apply
.
Changing the missing LUN response
Some operating systems do not look beyond LUN 0 if they do not find a LUN 0 or cannot handle
noncontiguous LUNs. The Missing LUN Response option handles these situations by enabling the host
drivers to continue probing for LUNs until they reach the LUN to which they have access.
This option controls the SCSI sense data returned for volumes that are not accessible because they don’t
exist or have been hidden through volume mapping (this does not apply to volumes of offline vdisks). Use
the default value unless a service technician asks you to change it to work around a host driver problem.
To change the missing LUN response
1.
In the Configuration View panel, right-click the system and select
Configuration > Advanced Settings >
Cache
.
2.
Set
Missing LUN Response
to either:
•
Not Ready
. Sends a reply that there is a LUN where a gap has been created but that it’s “not
ready.” Sense data returned is a Sense Key of
2h
and an ASC/ASCQ of
04/03
. This option is the
default.
•
Illegal Request
. Sends a reply that there is a LUN but that the request is “illegal.” Sense data
returned is a Sense Key of
5h
and an ASC/ASCQ of
25/00
.
3.
Click
Apply
.