B-8
Glossary
RAID 1
Uses data mirroring on pairs of drives so that data written to one drive
is simultaneously written to the other drive. RAID 1 works well for small
databases or other small applications that require complete data
redundancy.
RAID 5
Uses data striping and parity data across three or more drives
(distributed parity) to provide high data throughput and data redundancy,
especially for applications that require random access.
RAID 6
Uses data striping and parity data across three or more drives
(distributed parity) to provide high data throughput and data redundancy,
especially for applications that require random access. RAID 6 can
survive the failure of two drives.
RAID 10
A combination of RAID 0 and RAID 1 that uses data striping across two
mirrored drive groups. It provides high data throughput and complete
data redundancy.
RAID 50
A combination of RAID 0 and RAID 5 that uses data striping across two
drive groups with parity data. It provides high data throughput and
complete data redundancy.
RAID 60
A combination of RAID 0 and RAID 6 that uses data striping across two
drive groups with parity data. It provides high data throughput and
complete data redundancy. RAID 60 can survive the failure of two drives
in each RAID set in the spanned drive group.
RAID level
A virtual drive property indicating the RAID level of the virtual drive.
raw capacity
A drive property indicating the actual full capacity of the drive before any
coercion mode is applied to reduce the capacity.
read policy
A controller attribute indicating the current Read Policy mode. In Always
Read Ahead mode, the controller reads sequentially ahead of requested
data and stores the additional data in cache memory, anticipating that the
data will be needed soon. This speeds up reads for sequential data, but
there is little improvement when accessing random data. In No Read
Ahead mode, read ahead capability is disabled. In Adaptive Read Ahead
mode, the controller begins using read ahead if the two most recent drive
accesses occurred in sequential sectors. If the read requests are
random, the controller reverts to No Read Ahead mode.
ThinkServer SAS controllers support RAID levels 0, 1, 5, 6, 10, 50, and 60.
Содержание ThinkServer RD230
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Страница 3: ...ThinkServer RD230 RD240 and TD230 MegaRAID SAS Software User Guide ...
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Страница 68: ...2 36 Introduction to RAID ...
Страница 252: ...7 10 MegaRAID Storage Manager Window and Menus ...
Страница 262: ...8 10 Configuration Figure 8 5 Virtual Drive Creation Menu The dialog box shown in Figure 8 6 appears ...
Страница 300: ...8 48 Configuration ...
Страница 328: ...9 28 Monitoring System Events and Storage Devices ...
Страница 334: ...10 6 Maintaining and Managing Storage Configurations ...
Страница 360: ...B 12 Glossary ...
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