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Dell EMC PowerEdge RAID Controller CLI Reference Guide


Change virtual drive properties commands

NOTE: In the following, /cx specifies the controller, where x is the controller index, while /vx specifies the virtual drive, where x is the virtual drive ID.

The PERC Command Line Tool supports the following commands to change virtual drive properties:

perccli /cx/vx set accesspolicy=RW|RO|Blocked|RmvBlkd 
perccli /cx/vx set bootdrive=<on|off>
perccli /cx/vx set cbsize=0|1|2 cbmode=0|1|7 
perccli /cx/vx set ds=Default|Auto|None|Max|MaxNoCache
perccli /cx/vx set iopolicy=Cached|Direct
perccli /cx/vx set name=<NameString>
perccli /cx/vx set pdcache=On|Off|Default
perccli /cx/vx set pi=Off
perccli /cx/vx set rdcache=RA|NoRA
perccli /cx/vx set wrcache=WT|WB|FWB

The detailed description for each command follows.

perccli /cx/vx set accesspolicy=<RW|RO|Blocked|RmvBlkd>

This command sets the access policy on a virtual drive to read write, read only, or blocked or rmvblkd (remove blocked).

Input example:

perccli /c0/v0 set accesspolicy=rw


RW - Access is Read Write
RO - Access is Read Only
Blocked - Access is Blocked
RmvBlkd - Remove Blocked Access

perccli /cx/vx set bootdrive=<on|off>

Sets or unsets a virtual drive as the boot drive.

NOTE: Set bootdrive is applicable only in legacy BIOS mode.

Input example:

perccli /c0/v0 set bootdrive=on

perccli /cx/vx set cbsize=0|1|2 cbmode=0|1|7

This command sets the cache bypass size and cache bypass mode on a virtual drive.

Input example:

perccli /c0/v0 set cbsize=0 cbmode=7



0 — 64k cache bypass

1 — 128k cache bypass

2 — 256k cache bypass


0 — Enable intelligent mode cache bypass

1 — Enable standard mode cache bypass

7 — Disable cache bypass

perccli /cx/vx set ds=<Default|Auto|None|Max|MaxNoCache>

This command changes the power-saving properties on a virtual drive.

Input example:

perccli /c0/v0 set ds=Default


Default — Controller default power saving options are applied

Auto — Power savings is managed by firmware

None — Power savings is disabled

Maximum — Maximum power savings options are applied

MaxNoCache — Maximum power savings with no caching of writes are applied

perccli /cx/vx set iopolicy=<cached|direct>

This command sets the I/O policy on a virtual drive to cached I/O or direct I/O.

Input example:

perccli /c0/v0 set iopolicy=cached


Cached — I/Os are cached

Direct — I/Os are not cached

perccli /cx/vx set name=<NameString>

This command names a virtual drive. The name is restricted to 15 characters.


NameString — VD name

perccli /cx/vx set pdcache=<on|off|default>

This command sets the current disk cache policy on a virtual drive to on, off, or default setting.

Input example:

perccli /c0/v0 set pdcache=on


On — Enables pd caching

Off — Disables pd caching

Default —pd caching is set to default

perccli /cx/vx set pi=Off

This command disables the data protection of a virtual drive.

Input example:

perccli /cx/vx set pi=Off


Off — Disables data protection

perccli /cx/vx set rdcache=<ra|nora>

This command sets the read cache policy on a virtual drive to read ahead or no read ahead.

Input example:

perccli /c0/v0 set rdcache=nora


RA= Read ahead

NORA = No read ahead

perccli /cx/vx set wrcache=<WT|WB|FWB>

This command sets the write cache policy on a virtual drive to write back, write through, or always write back.

Input example:

perccli /c0/v0 set wrcache=wt


WT — Write through

WB — Write back

FWB — Force write back even in case of bad BBU

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