BC4000 Series RAID Controllers
User Manual
02/13/06
B ro ad c om C o r p or at i on
Page 120
Managing Controllers, Arrays, and Disks: bcadm --manage
Document
BC4000-UM100-R
--remove-global-spare, -rgs
The Remove Global Spare option removes spare disks as global spares. This option uses
--disk
as a qualifier.
--cache-array, -ca
The Cache Settings for Arrays option sets the cache attributes for arrays. You can choose from four array-
caching options:
•
No Cache
. When the No Cache option is selected for an array, I/O requests are translated and passed to
the disks without keeping a cached copy of the data available for future requests.
•
Read Cache
. When selected, the Read Cache option caches reads if appropriate and performs
sequential read ahead when necessary.
•
Write-Back Cache
. When the Write Back Cache setting is selected, writes are cached. This setting is
intended for advanced users who understand the implications of write caching.
•
Read + Write-Back Cache
(Default Setting). Both Read and Write Back Cache options can be selected;
this is the default setting.
This option uses
--array
as a qualifier.
Long form:
--remove-global-spare --disk <list>
Short form:
-rgs -d <list>
Example 1:
bcadm --manage --remove-global-spare --disk *
Example 2:
bcadm -M -rgs -d 5
Note:
Cache options cannot be changed while a task is active on that array, but can be changed at
any other time including while I/O is running.
Long form:
--cache-array <cache_attribute> --array <list>
Short form:
-ca <cache_attribute> -a <list>
The cache attributes are:
r
rw
w
nc
read cache
read and write-back cache
write-back cache
no cache
Example 1:
bcadm --manage --cache-array rw --array *
Example 2:
bcadm -M -ca nc -a 1