Intel SRCU32 - RAID Controller, Руководство пользователя

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36 Intel RAID Controller SRCU32 User’s Guide
Table 10. Additional Operational States
State Description
OK State The disk array is fully operational when in the OK state. All redundant
information is present, that is, a hard drive can fail without impairing the
functionality of the disk array. This is the normal state of a disk array.
Methods for Hard Drive Replacement
The Intel RAID Controller SRCU32 and the Intel RAID Controller SRCU32 firmware offer a
variety of methods to replace a defective hard drive. When to use them depends on the physical
environment of the server. With some servers the hard drives are mounted into the server
enclosure. They are not removable. With other servers there is an intelligent backplane (for
example, SAF-TE) and which hosts a number of hard drives with a Single Connector Attachment
(SCA). Another type of server uses the hard drive in a hot pluggable disk carrier. These carriers
are often unintelligent and do not communicate with the Intel RAID Controller SRCU32 or server,
though, they can display the hard drive’s temperature or the status of its built-in fan. The following
table contrasts the various hard drive replacement options.
Table 11. Hard Drive Replacement Options
Manual Hot Plug
Auto Hot Plug Automatic Replacement
with Hot Fix Drive
Typical
Server
Environment
Low Cost.
Hard drives are physically
mounted in the server
enclosure and are not
removable.
Additional cost for external
enclosure, cables,
backplanes, etc.
Hard drives are removable in
an intelligent or
non-intelligent subsystem.
The subsystem complies
with one of the following
enclosure standards:
“SAF-TE” (SCSI Accessed
Fault Tolerant Enclosures)
“SES” (SCSI Enclosure
Services)
“Intelligent Fault Bus” (former
DEC™ fault bus)
Non-Intelligent subsystems
using hot pluggable disk
carriers.
Low cost.
High availability.
The Intel RAID Controller
SRCU32 has a spare drive
available at all times. Should
one hard drive of an array
fail, the spare drive (hot fix
drive) is automatically built
into the array.
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