MSA 2040 SMU Reference Guide

Configuring advanced settings 53
To set or change the import passphrase
1. In the Configuration View panel, right-click the system and select Configuration > Advanced Settings > Full Disk
Encryption and select the Set Import Lock Key ID tab.
2. In the Passphrase field, enter the passphrase associated with the displayed lock key.
3. Re-enter the passphrase.
4. Click Import Passphrase. A dialog box will confirm the passphrase was changed successfully.
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 the Sync Cache Mode option 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, Not
Ready, unless the system is used in a VMware environment or 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 the Missing LUN Response option 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. If the system is used in a VMware environment, use this
option.
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.