HP LH4r HP NetServer FCArray Assistant - Installation and User Guide - Page 85

In Manual Configuration, the Add Logical Drive functions

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Chapter 4 Configuration 4. Check the Write Cache box if you want this logical drive to use Write Back caching. This improves performance but puts data at risk. You should have a battery backup unit or uninterruptable power supply if selecting this feature. 5. Check the Init Drive box if you want this logical drive to be fully initialized at the conclusion of the configuration. HP recommends checking this option. 6. If this is the first logical drive, select a stripe size. This setting will apply to all logical drives on this controller. The selection for stripe size will automatically set the appropriate cache size. 7. Click the Add Drive button to register the new logical drive. 8. Click the LUN Mapping tab to continue with the configuration. 9. Or, repeat the process above to set up additional logical drives, then click the LUN Mapping tab when you're done. Refer to LUN Mapping Tab in the following sections for LUN Mapping instructions. NOTE In Manual Configuration, the Add Logical Drive functions very similar to what was shown above. RAID Assistant shows you the disk arrays and logical drives and allows you to add to the configuration without risking existing data. LUN Mapping Overview RAID Controllers use host ports to connect to one or more Host Bus Adapters (HBAs) in one or more host computer systems. Mapping assigns Logical Unit Numbers (LUNs) to the logical drives of the RAID Controller and makes the logical drives (or system drives) available (or unavailable) to one or more host ports. The LUN assignments are made on a per host port basis and are independent of the assignments on other host ports. Logical drives may be assigned only one LUN per host port. However, if a LUN is not assigned to a logical drive on a particular host port, then the logical drive is inaccessible to that host port. 79

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Chapter 4
Configuration
79
4.
Check the
Write Cache
box if you want this logical drive to use Write
Back caching.
This improves performance but puts data at risk.
You should have a battery backup unit or uninterruptable power supply if
selecting this feature.
5.
Check the
Init Drive
box if you want this logical drive to be fully
initialized at the conclusion of the configuration.
HP recommends checking this option.
6.
If this is the first logical drive, select a stripe size.
This setting will apply to all logical drives on this controller.
The selection for stripe size will automatically set the appropriate cache
size.
7.
Click the
Add Drive
button to register the new logical drive.
8.
Click the
LUN Mapping
tab to continue with the configuration.
9.
Or, repeat the process above to set up additional logical drives, then click
the LUN Mapping tab when you’re done.
Refer to LUN Mapping Tab
in the following sections
for LUN Mapping
instructions.
NOTE
In Manual Configuration, the Add Logical Drive functions
very similar to what was shown above. RAID Assistant shows
you the disk arrays and logical drives and allows you to add to
the configuration without risking existing data.
LUN Mapping Overview
RAID Controllers use host ports to connect to one or more Host Bus Adapters
(HBAs) in one or more host computer systems. Mapping assigns Logical Unit
Numbers (LUNs) to the logical drives of the RAID Controller and makes the
logical drives (or system drives) available (or unavailable) to one or more host
ports. The LUN assignments are made on a per host port basis and are
independent of the assignments on other host ports. Logical drives may be
assigned only one LUN per host port. However, if a LUN is not assigned to a
logical drive on a particular host port, then the logical drive is inaccessible to that
host port.