IBM 866251Y - Netfinity 5500 M20, Руководство по техническому обслуживанию аппаратной части, Страница: 99 / 386

mode when you select a specific logical
drive icon from the Main Tree.
When this feature is set to the
write-through mode, the completion
status of a write command is sent
after
the data is written to the hard disk drive.
Under certain workloads, you can
improve performance by changing this
setting to the write-back mode, where
the completion status of a write
command is sent
after the data is copied
to cache memory, but before the data is
actually written to the storage device.
Attention
1. You might lose data if a power
outage occurs while using the
write-back mode without a
battery-backup cache device.
2. If you do not have a
battery-backup cache installed
and Enabled and you set this
feature to the write-back mode,
wait at least 10 seconds after
the last operation before you
turn off the system. Failure to
follow this practice can result in
lost data.
Ÿ
Synchronize: This choice is available
in the Information mode when you select
a logical drive from the Main Tree and
the following conditions are both true:
– The ServeRAID adapter or
controller does not support the
auto-synchronization feature.
– You previously selected Options
from the View pull-down menu and
disabled the “Synchronize all new
RAID level-5 logical drives” setting.
Synchronizing a logical drive verifies that
the data redundancy for the logical drive
is correct. You must synchronize all
RAID level-5 logical drives before storing
data. (See page 79 for more
information.)
Ÿ
Initialize: This choice is available in the
Information mode when you select a
logical drive from the Main Tree and you
previously selected Options from the
View pull-down menu and disabled the
“Automatically initialize new logical
drives” setting.
Netfinity 5500 M20 - Type 8662
91