Sans Digital accuraid ari08x, Быстрое руководство по установке

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WB
W rite- B ack cache-write policy. A caching technique in which the completion of a
write request is signaled as soon as the data is in cache and actual writing to non-
volatile media occurs at a later time. It speeds up system write performance but
needs to bear the risk where data may be inconsistent between data cache and the
physical disks in one short time interval.
RO Set the volume to be R ead- O nly.
DS
D edicated S pare disks. The spare disks are only used by one specific VG. Others
could not use these dedicated spare disks for any rebuilding purpose.
GS
G lobal S pare disks. GS is shared for rebuilding purpose. If some VGs need to use
the global spare disks for rebuilding, they could get the spare disks out from the
common spare disks pool for such requirement.
DC D edicated C ache.
GC G lobal C ache.
DG
D
e
G
raded mode. Not all of the array’s member disks are functioning, but the array
is able to respond to application read and write requests to its virtual disks.
SCSI S mall C omputer S ystems I nterface.
SAS S erial A ttached S CSI.
iSCSI I nternet S mall C omputer S ystems I nterface.
FC F ibre C hannel
S.M.A.R.T. S elf- M onitoring A nalysis and R eporting T echnology.
WWN W orld W ide N ame.
HBA H ost B us A dapter.
SAF-TE S CSI A ccessed F ault- T olerant E nclosures.
SES S CSI E nclosure S ervices.
NIC N etwork I nterface C ard.
LACP L
ink
A
ggregation
C
ontrol
P
rotocol.
MC/S M ultiple C onnections per S ession
MTU M aximum T ransmission U nit.
CHAP
C hallenge H andshake A uthentication P rotocol. An optional security mechanism to
control access to an iSCSI storage system over the iSCSI data ports.
iSNS I nternet S torage N ame S ervice.
1.3 RAID levels
RAID 0 Disk striping. RAID 0 needs at least one hard drive.
RAID 1 Disk mirroring over two disks. RAID 1 needs at least two hard drives.
N-way mirror Extension to RAID 1 level. It has N copies of the disk.
RAID 3 Striping with parity on the dedicated disk. RAID 3 needs at least three hard drives.
RAID 5
Striping with interspersed parity over the member disks. RAID 3 needs at least
three hard drives.
RAID 6
2-dimensional parity protection over the member disks. RAID 6 needs at least four
hard drives.
RAID 0+1
Mirroring of the member RAID 0 volumes. RAID 0+1 needs at least four hard
drives.