Avago Technologies 3ware SAS 9750-16i4e - Manual (Page 151)

About Inoperable Units
www.lsi.com/channel/products 139
You can still read and write data from a degraded unit, but the unit will not be
fault tolerant until it is rebuilt using the Rebuild feature.
When a RAID unit becomes degraded, it is marked as such, and the drive(s)
that failed are marked as
Not In Use in the 3BM screens and Degraded in the
3DM2 pages. If supported by your enclosure, the LED for failed drives may
turn red.
You should replace the failed drive and rebuild the unit as soon as it is
convenient to do so. The unit will not be fault tolerant until it has been rebuilt.
Rebuilding can occur automatically, depending on your settings. For more
information, see “Rebuilding Units” on page 154.
About Inoperable Units
Units become inoperable when there are no longer enough drives in the unit
for it to function. For example, a RAID 5 unit created from four drives
becomes degraded if one drive fails or is removed, but becomes inoperable if
two drives fail or are removed. A RAID 6 unit created from five drives
becomes degraded if one or two drives is removed, but becomes inoperable if
three drives fail or are removed.
Data on an inoperable unit cannot be accessed unless the missing drives are
reconnected.
If you have data on a unit that is currently “inoperable,” contact technical
support. A form is available on the web at
http://www.lsi.com/channel/ContactUs .
Locating a Drive by Blinking Its LED
If you use a supported enclosure with enclosure services, you may be able to
easily identify the drives in a unit, or locate an individual drive, by causing the
LEDs associated with the drives to blink.
You can issue the command to blink the LED through 3DM2 or 3BM.
For details about what the different LED patterns on the enclosure may mean,
see “Enclosure Drive LED Status Indicators” on page 136.
To blink the LED for a drive through 3DM2
1 Do one of the following:
• Choose Information >> Drive Information from the main menu in
3DM2. On the Drive Information page, identify the drive you want to
physically locate.