Disk Array Configuration; Logical Disk (Ld) Selection - NEC Storage Manager User Manual

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For the disk array to be connected, determine the configuration for using the data replication.
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According to the disk capacity necessary for business or operation conditions, determine the logical
disk (LD) and hot spare configurations. For the 4000 series and the 3000 series, disk array
configurations are executed by maintenance personnel and therefore should be determined before
installation. To improve the access performance and keep tolerance against physical disk (PD) faults,
assign MV and RV to different ranks. MV and RV to be paired should have the same LD capacity.
If LD configuration is changed after starting the server, be sure to execute the create/display Volume
List command (iSMvollist -cr) after changing the configuration.
Figure 1-3 shows an example of setting five pairs.
RANK00
LD00
PD00 PD01 PD02 PD03
PD10 PD11 PD12 PD13
RANK05
LD05
• The PD group number for PD and RANK is 00.
• One LD is associated with one RANK. (The whole area for one RANK is assigned to one LD.)
• LD00 and LD05 are in RAID5 (4+P) configuration.
• LD01 to LD04 and LD06 to LD09 are in RAID1 configuration.
• Each DE has two spare disks.
• LD00 to LD04 are used for MV and LD05 to LD09 are for RV.
* This configuration is just an example. Actual configuration should be determined based on your
business conditions.
D i s k A r r a y
D i s k A r r a y
D i s k A r r a y
L o g i c a l D i s
L o g i c a l D i s
L o g i c a l D i s
RANK01
LD01
PD04 PD05 PD06
PD14 PD15 PD16
RANK06
LD06
Figure 1-3 LD Configuration Example (2000 series)
Chapter 1 Installation Procedure
C o n f i g u r a t
C o n f i g u r a
C o n f i g u r a
k ( L D ) S e l e c
k ( L D ) S e l e c
k ( L D ) S e l e c
MV
RANK02 RANK03
LD02 LD03
PD07 PD08 PD09
PD17 PD18 PD19
RANK07 RANK08
LD07 LD08
RV
9
i o n
t i o n
t i o n
t i o n
t i o n
t i o n
RANK04
LD04
PD0a PD0b PD0c PD0d
PD1a PD1b PD1c PD1d
RANK09
LD09
PD0e
PD1e
Spare Disks