iSCSI Configuration on the SnapServer
90
SnapServer Administrator Guide
the significant increase in write performance that write-cache provides, can disable
this feature for individual iSCSI disks.
Notes
• Write-cache can be disabled on an iSCSI-disk-by-iSCSI-disk basis. Disabling
write-cache for an iSCSI disk does
not
disable write-cache for any other iSCSI
disk or any other resources on the SnapServer.
• The opportunity to enable/disable write-cache for an iSCSI disk occurs only
when the disk is created; it cannot be toggled at a later date.
• Disabling write-cache for an iSCSI disk does not eliminate
all
potential risk of
data loss due to an unexpected loss of power as each disk drive contains its
own internal cache of 8 MB or more.
Disconnect iSCSI Disk Initiators before Shutting Down the Server
Shutting down the server while a client initiator is connected to an iSCSI disk
appears to the client initiator software as a disk failure and may result in data loss
or corruption. Make sure any initiators connected to iSCSI disks are disconnected
before shutting down the server.
Ignore the
Volume is Full
Message
When an iSCSI disk is created, the volume allocates the specified capacity to the
disk. If all volume capacity is allocated to the iSCSI disk and email notification is
enabled, the SnapServer may generate a
Volume is Full
message. This message
indicates only that the volume capacity is fully allocated to the iSCSI disk and is not
available to other resources. To determine the status of iSCSI disk storage
utilization, use the tools provided on the client machine.
iSCSI Disk Naming Conventions
iSCSI disks are assigned formal IQN names. These appear as the iSCSI device
names that the user chooses (or types) when connecting from a client initiator to the
SnapServer target, and also on the iSCSI Disk details page.
• The format of IQN names for GuardianOS iSCSI disks on the SnapServer is:
iqn.1997-10.com.snapserver:[servername]:[diskname]
where
[servername]
is the name of the SnapServer, and
[diskname]
is the name of
the iSCSI disk on the target SnapServer. For example:
iqn.1997-10.com.snapserver:snap123456:iscsi0
Note
Users with iSCSI disks created in earlier GuardianOS versions will see a
shortened IQN name in the following format:
Summary of Contents for 5325301507 - Snap Server 4400 NAS
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