Here are some useful commands:
View information about the RAID adapter
For checking the firmware version, battery back-up unit presence, installed cache memory and the capabilities of the adapter:
# MegaCli64 -AdpAllInfo -aAll
View information about the battery backup-up unit state
# MegaCli64 -AdpBbuCmd -aAll
View information about virtual disks
Useful for checking RAID level, stripe size, cache policy and RAID state:
# MegaCli64 -LDInfo -Lall -aALL
View information about physical drives
# MegaCli64 -PDList -aALL
Patrol read
Patrol read is a feature which tries to discover disk error before it is too late and data is lost. By default it is done automatically (with a delay of 168 hours between different patrol reads) and will take up to 30% of IO resources.
To see information about the patrol read state and the delay between patrol read runs:
# MegaCli64 -AdpPR -Info -aALL
To find out the current patrol read rate, execute
# MegaCli64 -AdpGetProp PatrolReadRate -aALL
To reduce patrol read resource usage to 2% in order to minimize the performance impact:
# MegaCli64 -AdpSetProp PatrolReadRate 2 -aALL
To disable automatic patrol read:
# MegaCli64 -AdpPR -Dsbl -aALL
To start a manual patrol read scan:
# MegaCli64 -AdpPR -Start -aALL
To stop a patrol read scan:
# MegaCli64 -AdpPR -Stop -aALL
You could use the above commands to run patrol read in off-peak times.
Migrate from one RAID level to another
In this example, I migrate the virtual disk 0 from RAID level 6 to RAID 5, so that the disk space of one additional disk becomes available. The second command is used to make Linux detect the new size of the RAID disk.
# /usr/local/sbin/MegaCli64 -LDRecon -Start -r5 -L0 -a0
# echo 1 > /sys/block/sda/device/rescan
Create a new RAID 5 virtual disk from a set of new hard drives
First we need to now the enclosure and slot number of the hard drives we want to use for the new RAID disk. You can find them out by the first command. Then I add a virtual disk using RAID level 5, followed by the list of drives I want to use, specified by enclosure:slot syntax.
# MegaCli64 -PDList -aALL | egrep 'Adapter|Enclosure|Slot|Inquiry'
# MegaCli64 -CfgLdAdd -r5'[252:5,252:6,252:7]' -a0
View reconstruction progress
When reconstructing a RAID array, you can check its progress with this command.
# MegaCli64 -LDRecon ShowProg L0 -a0
(replace L0 by L1 for the second virtual disk, and so on)
Configure write-cache to be disabled when battery is broken
# MegaCli64 -LDSetProp NoCachedBadBBU -LALL -aALL
Change physical disk cache policy
If your system is not connected to a UPS, you should disable the physical disk cache in order to prevent data loss.
# MegaCli -LDGetProp -DskCache -LAll -aALL
To enable it (only do this if you have a UPS and redundant power supplies):
# MegaCli -LDGetProp -DskCache -LAll -aALL
megactl
Despites megasasctl doesn't seem to work with recent cards, you should really give it a try.
Print current controller status:
server:~# megasasctl
a0 PERC 5/i Integrated encl:1 ldrv:1 batt:good
a0d0 136GiB RAID 1 1x2 optimal
a0e8s0 136GiB a0d0 online
a0e8s1 136GiB a0d0 online
[root@server ~]# megasasctl
a0 PERC 5/i Integrated encl:1 ldrv:2 batt:good
a0d0 67GiB RAID 1 1x2 optimal
a0d1 836GiB RAID 5 1x4 optimal
a0e8s0 68GiB a0d0 online
a0e8s1 68GiB a0d0 online
a0e8s2 279GiB a0d1 online
a0e8s3 279GiB a0d1 online
a0e8s4 279GiB a0d1 online
a0e8s5 279GiB a0d1 online
[root@server ~]# megasasctl
a0 PERC 6/i Integrated encl:1 ldrv:1 batt:good
a0d0 1861GiB RAID 6 1x6 optimal
a0e32s0 465GiB a0d0 online
a0e32s1 465GiB a0d0 online
a0e32s2 465GiB a0d0 online
a0e32s3 465GiB a0d0 online
a0e32s4 465GiB a0d0 online
a0e32s5 465GiB a0d0 online
server:~# megaraidsas-status
-- Arrays informations --
-- ID | Type | Size | Status
a0d0 | RAID 1 | 136GiB | optimal
-- Disks informations
-- ID | Model | Status | Warnings
a0e8s0 | SEAGATE ST3146854SS 136GiB | online
a0e8s1 | SEAGATE ST3146854SS 136GiB | online
[root@server ~]# megaraidsas-status
-- Arrays informations --
-- ID | Type | Size | Status
a0d0 | RAID 1 | 67GiB | optimal
a0d1 | RAID 5 | 836GiB | optimal
-- Disks informations
-- ID | Model | Status | Warnings
a0e8s0 | FUJITSU MBA3073RC 68GiB | online
a0e8s1 | FUJITSU MBA3073RC 68GiB | online
a0e8s2 | SEAGATE ST3300656SS 279GiB | online
a0e8s3 | SEAGATE ST3300656SS 279GiB | online
a0e8s4 | SEAGATE ST3300656SS 279GiB | online
a0e8s5 | SEAGATE ST3300656SS 279GiB | online
[root@server ~]# megaraidsas-status
-- Arrays informations --
-- ID | Type | Size | Status
a0d0 | RAID 6 | 1861GiB | optimal
-- Disks informations
-- ID | Model | Status | Warnings
a0e32s0 | SEAGATE ST3500620SS 465GiB | online
a0e32s1 | SEAGATE ST3500620SS 465GiB | online
a0e32s2 | SEAGATE ST3500620SS 465GiB | online
a0e32s3 | SEAGATE ST3500620SS 465GiB | online
a0e32s4 | SEAGATE ST3500620SS 465GiB | online
a0e32s5 | SEAGATE ST3500620SS 465GiB | online
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