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MegaRAID SAS Software User Guide Chapter 5: MegaRAID Command Tool
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Virtual Drive-Related Options
5.14.11 Clear the LDBBM Table Entries
Use the command in the following table to clear the LDBBM table entries.
5.14.12 Display the List of Virtual
Drives with Preserved Cache
Use the command in the following table to display the list of virtual drives that have
preserved cache. Preserved cache is cache that remains in the controller cache after a
drive goes offline or missing and that has not been saved to a drive yet. You can reboot
and manage the preserved cache.
5.14.13 Discard the Preserved Cache of
a Virtual Drive(s)
Use the command in the following table to discard the preserved cache of a virtual
drive(s).
5.14.14 Expand a Virtual Drive
Use the command in the following table to expand a virtual drive.
Table 82: Clear the LDBBM Table Entries
Convention
MegaCli -LDBBMClr -Lx|-L0,1,2,...|-Lall
-aN|-a0,1,2|-aALL
Description Clears the LDBBM table entries for the virtual drive(s) on the selected
adapter(s).
Table 83: Display the List of Virtual Drives with Preserved Cache
Convention
MegaCli -GetPreservedCacheList -aN|-a0,1,2|-aALL
Description Display the list of virtual drives that have preserved cache.
Table 84: Discard the Preserved Cache of a Virtual Drive(s)
Convention
MegaCli -DiscardPreservedCache -Lx|-L0,1,2|-Lall
-force -aN|-a0,1,2|-aALL
Description Discard the preserved cache of the virtual drive(s).
Table 85: Discard the Preserved Cache of a Virtual Drive(s)
Convention
MegaCli -LdExpansion -pN -dontExpandArray
-Lx|-L0,1,2|-Lall -aN|-a0,1,2|-aALL
Description Expands the virtual drive within the existing array or beyond the size of the
existing array if you replace the drives with larger drives.
-pN
: Denotes the percentage of the array to use to expand the virtual drive.
N
ranges from 0 to 100 percent. For example,
-p30
indicates expansion up
to 30 percent of available array size.
-dontExpandArray
: Expand a virtual drive within the array, even when
there is room to expand the array.
For example, you have created a 5 GB RAID 1 virtual drive with two 30 Gbyte
drives. The array size is 30 GB and the virtual drive size is 5 GB. If you replace
the two 30-GB drives with two 60-GB drives, the array size is still 30 GB
(because of previous configuration). You have two options:
1. Expand the virtual drive within the array.
Use the
-dontExpandArra
option to expand the virtual drive up to 30
GB.
2. Expand the virtual drive beyond the existing array size
Use the
-pN
option to expand the virtual drive beyond 30 GB and up to
60 GB (the size of the replacement drives).