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HP MSA2312sa HP StorageWorks 2000 G2 Modular Smart Array reference guide (5009 - Page 40

Changing cache settings, Changing the synchronize-cache mode, Changing the missing LUN response - drivers

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Changing 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. Controlling host access to the system's write-back cache setting You can prevent hosts from using SCSI MODE SELECT commands to change the system's write-back cache setting. Some operating systems disable write cache. If host control of write-back cache is disabled, the host cannot modify the cache setting. The default is Disabled. This option is useful in some environments where the host disables the system's write-back cache, resulting in degraded performance. To change host access to the write-back cache setting 1. In the Configuration View panel, right-click the system and select Configuration > Advanced Settings > Cache. 2. Either select (enable) or clear (disable) the Host Control of Write-Back Cache option. 3. Click Apply. 40 Configuring the system

Section	Page
Contents	3
Figures	7
Tables	9
About this guide	11
Intended audience	11
Prerequisites	11
Related documentation	11
Document conventions and symbols	11
HP technical support	12
Product warranties	12
Subscription service	12
HP web sites	12
Documentation feedback	12
Getting started	13
Configuring and provisioning a new storage system	13
Browser setup	13
Signing in	13
Tips for signing in and signing out	14
Tips for using the main window	14
Tips for using the help window	15
System concepts	15
About user accounts	15
About vdisks	16
About spares	16
About volumes	17
About hosts	17
iSCSI host security	17
About volume mapping	18
About volume cache options	19
Using write-back or write-through caching	19
Optimizing read-ahead caching	19
About the Snapshot feature	20
About the Volume Copy feature	21
About the VDS and VSS hardware providers	23
About RAID levels	23
About size representations	25
About the system date and time	25
About storage-space color codes	26
About vdisk reconstruction	26
About data protection in a single-controller storage system	27
Configuring the system	29
Using the Configuration Wizard	29
Step 1: Starting the wizard	29
Step 2: Change default passwords	29
Step 3: Configuring network ports	29
Step 4: Enabling system-management services	29
Step 5: Setting system information	30
Step 6: Configuring event notification	30
Step 7: Configuring host ports	31
Step 8: Confirming configuration changes	32
Installing a license	32
Configuring system services	33
Changing management interface settings	33
Configuring email notification	34
Configuring SNMP notification	34
Configuring user accounts	34
Adding users	34
Modifying users	35
Removing users	36
Configuring system settings	36
Changing the system date and time	36
Changing host interface settings	37
Changing network interface settings	38
Setting system information	38
Configuring advanced settings	39
Changing disk settings	39
Configuring SMART	39
Configuring dynamic spares	39
Configuring the EMP polling rate	39
Changing cache settings	40
Changing the synchronize-cache mode	40
Changing the missing LUN response	40
Controlling host access to the system's write-back cache setting	40
Changing auto-write-through cache triggers and behaviors	41
Configuring partner firmware update	41
Configuring system utilities	41
Configuring background scrub	41
Configuring utility priority	42
Configuring a vdisk	42
Managing dedicated spares	42
Changing a vdisk's name	43
Changing a vdisk's owner	43
Configuring a volume	43
Changing a volume's name or OpenVMS UID	43
Changing a volume's cache settings	44
Provisioning the system	45
Using the Provisioning Wizard	45
Step 1: Starting the wizard	45
Step 2: Specifying the vdisk name and RAID level	45
Step 3: Selecting disks	46
Step 4: Defining volumes	46
Step 5: Setting the default mapping	46
Step 6: Confirming vdisk settings	47
Creating a vdisk	47
Deleting vdisks	47
Expanding a vdisk	48
Before expanding a vdisk	48
Managing global spares	48
Creating a volume set	49
Creating a volume	49
Deleting volumes	50
Changing a volume's default mapping	50
Changing a volume's explicit mappings	51
Expanding a volume	51
Creating multiple snapshots	52
Creating a snapshot	52
Deleting a snapshot	53
Resetting a snapshot	53
Creating a volume copy	54
Aborting a volume copy	55
Rolling back a volume	55
Adding a host	56
Removing hosts	56
Changing a host's name	57
Changing host mappings	57
Configuring CHAP	58
Deleting schedules	58
Using system tools	59
Updating firmware	59
Updating controller module firmware	59
Updating expansion module firmware	59
Updating disk firmware	60
Saving logs	61
Resetting a host port	61
Rescanning disk channels	62
Clearing disk metadata	62
Restarting or shutting down controllers	62
Restarting	62
Shutting down	63
Verifying a vdisk	64
Scrubbing a vdisk	64
Removing a vdisk from quarantine	65
Viewing system status	67
Viewing information about the system	67
System properties	67
Enclosure properties	67
Disk properties	67
Vdisk properties	67
Volume properties	67
Snap-pool properties	67
Snapshot properties	68
Schedule properties	68
Configuration limits	68
Licensed features	68
Version properties	68
Viewing the system event log	68
Viewing information about all vdisks	69
Viewing information about a vdisk	70
Vdisk properties	70
Disk properties	71
Volume properties	72
Snap-pool properties	72
Viewing information about a volume	72
Volume properties	72
Mapping properties	72
Schedule properties	73
Viewing information about a snapshot	73
Snapshot properties	73
Mapping properties	74
Schedule properties	74
Viewing information about all hosts	74
Viewing information about a host	74
Host properties	75
Mapping properties	75
Viewing information about an enclosure	75
SNMP reference	77
Standard MIB-II behavior	77
Enterprise traps	77
FA MIB 2.2 SNMP behavior	78
External details for certain FA MIB 2.2 objects	83
External details for connUnitRevsTable	83
External details for connUnitSensorTable	84
External details for connUnitPortTable	85
Configuring SNMP event notification in SMU	85
SNMP management	85
Enterprise trap MIB	85
FA MIB 2.2 and 4.0 Differences	87
Event code reference	89
Using FTP to download logs and update firmware	107
Downloading system logs	107
Updating controller module firmware	108
Updating expansion module firmware	109
Updating disk firmware	110
Installing a license file	111
Glossary	113

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Configuring the system

Changing 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

In the Configuration View panel, right-click the system and select

Configuration > Advanced Settings >

Cache

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.

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

In the Configuration View panel, right-click the system and select

Configuration > Advanced Settings >

Cache

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

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

and an ASC/ASCQ of

25/00

Click

Apply

Controlling host access to the system's write-back cache setting

You can prevent hosts from using

SCSI MODE SELECT

commands to change the system's write-back cache

setting. Some operating systems disable write cache. If host control of write-back cache is disabled, the

host cannot modify the cache setting. The default is Disabled.

This option is useful in some environments where the host disables the system's write-back cache, resulting

in degraded performance.

To change host access to the write-back cache setting

In the Configuration View panel, right-click the system and select

Configuration > Advanced Settings >

Cache

Either select (enable) or clear (disable) the

Host Control of Write-Back Cache

option.

Click

Apply