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Nec express5800 tm800 nl Manual

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User Guide
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Logical Drive Problems
While disk drives are highly reliable, on occasion a disk drive can fail. Faulttolerant
(RAID 1, 5 and 10) logical drives go Critical when a disk drive fails. Non fault-tolerant
logical drives (RAID 0) and JBOD go Offline when a disk drive fails.
When a fault-tolerant logical drive goes Critical, one of two things must happen in
order to restore the logical drive to Functional status:
■ If a hot spare drive is available, the FastTrak Controller will automatically begin
rebuilding the logical drive with the hot spare. You must replace the failed drive,
which becomes the new hot spare.
■ If a hot spare drive is not available, you must replace the failed drive, after which
the FastTrak controller will automatically rebuild the logical drive.
In either case, you must identify the failed drive so you can replace it.
When you boot your system, the FastTrak BIOS screen informs you if there is a critical
or offline logical drive. If you enabled the Halt On Error option, your system will stop
booting at this point.
1. Press Ctrl-F to access the FastBuild utility.
2. From the Main Menu screen, press 3 to see the Define LD Menu.
3. Press the up and down arrow keys to select the logical drive with Critical
status and press Enter.
The Define LD Menu for the Critical logical drive displays.
In the Define LD Menu screen, compare the number of drives assigned to the
logical drive (Total Drv) with the disk drives listed under Drive Assignments.
RAID 0 and JBOD
Because RAID 0 and JBOD logical drives are not fault-tolerant, there is no way to
rebuild the logical drive when a disk drive fails. After you replace the failed disk drive,
you must create a new logical drive and copy your data to it from a backup source.
Note: Please refer to the FastBuild online documentation for
more information.
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