3Ware 9650SE-2LPB-10 CLI Guide - Page 80

Table 12: Supported Stripe Sizes, group=2, stripe, noscan, nocache, autoverify

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Chapter 2. CLI Syntax Reference the best of net capacity and performance). For 15 disks, the disks can be grouped into groups of 3 or 5 drives. For 16 disks, the disks can be grouped into groups of 4 or 8 drives. Note that RAID-10 always has group=2, so an attribute specifying it's group is not necessary. stripe=Stripe consists of the stripe size to be used. The following table illustrates the supported and applicable stripes on unit types and controller models. Stripe size units are in KB (kilobytes). Table 12: Supported Stripe Sizes Model R0 R1 R5 R6 R10 7/8000 64 N/A 64 N/S 64 128 128 256 256 512 512 1024 1024 9000a 16 N/A 16 N/S 16 64 64 N/S 64 256 256 N/S 256 9650SE 16 N/A 16 16 64 64 64 64 256 256 256 a. Models 9500S, 9550SX, and 9590SE JBOD Spare R50 N/A N/A N/S N/A N/A 16 64 256 N/A N/A 16 64 256 Single N/S N/S N/S noscan attribute instructs CLI not to notify the operating system of the creation of the new unit. By default CLI will inform the operating system. One application of this feature is to prevent the operating system from creating block special devices such as /dev/sdb and /dev/sdc as some implementations might create naming fragmentation and a moving target. nocache attribute instructs CLI to disable the write cache on the migrated unit. Enabling write cache increases write performance at the cost of potential data loss in case of sudden power loss (unless a BBU or UPS is installed). By default the cache is enabled. To avoid the possibility of data loss in the event of a sudden power loss, it is recommended not to set nocache unless there is a BBU (battery backup unit) or UPS (uninterruptible power supply) installed. autoverify attribute enables the autoverify attribute on the unit that is to be migrated. For more details on this feature, see "/cx/ux set autoverify=on|off" on page 68. 74 3ware Serial ATA RAID Controller CLI Guide

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Chapter 2. CLI Syntax Reference
74
3ware Serial ATA RAID Controller CLI Guide
the best of net capacity and performance). For 15 disks, the disks can be
grouped into groups of 3 or 5 drives. For 16 disks, the disks can be grouped
into groups of 4 or 8 drives.
Note that RAID-10 always has
group=2
, so an attribute specifying it’s group
is not necessary.
stripe=
Stripe
consists of the stripe size to be used. The following table
illustrates the supported and applicable stripes on unit types and controller
models. Stripe size units are in KB (kilobytes).
noscan
attribute instructs CLI not to notify the operating system of the
creation of the new unit. By default CLI will inform the operating system.
One application of this feature is to prevent the operating system from
creating block special devices such as /dev/sdb and /dev/sdc as some
implementations might create naming fragmentation and a moving target.
nocache
attribute instructs CLI to disable the write cache on the migrated
unit. Enabling write cache increases write performance at the cost of potential
data loss in case of sudden power loss (unless a BBU or UPS is installed). By
default the cache is enabled. To avoid the possibility of data loss in the event
of a sudden power loss, it is recommended not to set nocache unless there is a
BBU (battery backup unit) or UPS (uninterruptible power supply) installed.
autoverify
attribute enables the autoverify attribute on the unit that is to be
migrated. For more details on this feature, see “/cx/ux set autoverify=on|off”
on page 68.
Table 12: Supported Stripe Sizes
Model
R0
R1
R5
R6
R10
JBOD
Spare
R50
Single
7/8000
64
N/A
64
N/S
64
N/A
N/A
N/S
N/S
128
128
256
256
512
512
1024
1024
9000
a
a.
Models 9500S, 9550SX, and 9590SE
16
N/A
16
N/S
16
N/A
N/A
16
N/S
64
64
N/S
64
64
256
256
N/S
256
256
9650SE
16
N/A
16
16
N/A
N/A
16
N/S
64
64
64
64
64
256
256
256
256