LSI Logic Megaraid
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Introduction
Administration
On Linux all management tools communicate with the controller through a character device called "megadev$n" with the major number is 254 and the minor is $n.[1]
An example entry looks like this:
crw-r--r-- 1 root root 254, 0 May 29 13:43 /dev/megadev0
Preboot
Unbranded controllers offer either a GUI (which requires a (PS/2) mouse attached to the computer) or an terminal interface. Branded ones (at least Intel) only offer the GUI variant.
megamgr
ncurses-based management tool. Looks exactly like the terminal-style management interface.
megamonitor
megarc
CLI-management tool. Necessary since many tasks are only complicated or not possibel with megamgr.
Here's a short command reference for often needed tasks since the documentation is less than optimal:
- megarc ?
Shows the megarc help, listing all of its 66 flags
- megarc -dispCfg -a0
Shows the current config.
- megarc -LogPhysInfo -a0
Shows all logical volumes and physical drives
- megarc -delLD -a0 -Ln
Deletes the given logical volume. THIS IS FINAL! BE DEARLY SURE OF WHAT YOU'RE DOING!
- megarc -addCfg -a0 -R5[0:0,0:1,1:0]
Creates a RAID5 consisting of the given physical drives (BUS:TARGET).
- megarc -spanaddcfg -a0 -R10 -array0[0:1,1:1] -array1[0:2,1:2] -array2[0:3,1:3] -array3[0:4,1:4]
Creates a RAID 10 consisting of the given RAID1-members. The arrays can only consist of two drives.
- megarc -saveCfg -f/tmp/file -a0
Saves the current configuration to the given file. Could be restored with -restorCfg, although this is still UNTESTED.
- ↑ At least in 2.4 and 2.6. Be sure to check /proc/devices for the actual numbers if you should run into problems
