Megarc
Megarc is a commandline utility that provides an interface to many of the configuration and reporting functions for LSI Logic's MegaRAID BIOS (http://www.lsilogic.com).
Megarc port for FreeBSD
The megarc utility ships in binary format, without any accompanying documentation, on the "Megaraid Universal Software Suite" CD which accompanies any boxed LSI Logic RAID storage adapter. It is also found in the FreeBSD ports collection.
- On the CD that comes with the storage adapter, the utility is found in two places. It is part of a zipped bundle in <cd>:\SW_Components\Drivers\dr_freebsd_1.51.zip on our distribution. The zip file contents are as follows:
Length Date Time Name
-------- ---- ---- ----
130448 04-18-05 14:10 MegaRC 1.04.zip
12953 10-08-04 16:05 amr_x86_64_ver1_51FreeBSD5.3.tgz
153600 03-17-05 15:19 code.tar
535 02-10-05 11:02 FreeBSDDriverUpdate.txt
12774 10-12-04 19:38 amr_i386_ver_1_51_FreeBSD5.3.tgz
-------- -------
310310 5 files
- The utility is also found on the CD by itself, at "<cd>:\SW_Components\Utilities\ut_FreeBSD_MegaRC 1.04.zip".
- It can be also be installed from the ports collection at /usr/ports/sysutils/megarc. The port extracts the binary from the bundled dr_freebsd_*.zip
Documentation
The documentation for megarc is limited to the output of its ?/-help functions. Since these Raid adapters are reasonably popular, and the commands are a bit scary and somewhat obscurely named, this page might prove helpful to someone even though it's not complete. To see the commands available, type:
megarc ?
- Gives complete help
megarc -help
- list of functions
megarc -functionality ?
- functionality specific help
Example: Cmd -ctlrInfo ?
- help on -ctlrinfo option
For the examples below, we are using an LSILogic 150-6 x64 SATA RAID adapter on a 32-bit PCI slot - "adapter 0" on the system - with a RAID 5 volume consisting of five (5) physical SATA drives of 400GB each. The hot-spare belongs at target 00 but is being replaced at the time of this writing.
Below are some brief descriptions of some of the commands, and some examples of output from a few of the information functions. These commands are not case-sensitive.
megarc -dispCfg -a0
Display the configuration for adapter 0.
Logical Drive : 0( Adapter: 0 ): Status: OPTIMAL
---------------------------------------------------
SpanDepth :01 RaidLevel: 5 RdAhead : No Cache: DirectIo
StripSz :064KB Stripes : 5 WrPolicy: WriteThru
Logical Drive 0 : SpanLevel_0 Disks
Chnl Target StartBlock Blocks Physical Target Status
---- ------ ---------- ------ ----------------------
0 01 0x00000000 0x2e936800 ONLINE
0 02 0x00000000 0x2e936800 ONLINE
0 03 0x00000000 0x2e936800 ONLINE
0 04 0x00000000 0x2e936800 ONLINE
0 05 0x00000000 0x2e936800 ONLINE
megarc -LogPhysInfo -a0
Display the physical drive information for each of the logical drives on adapter 0.
Logical drive 0: RaidLevel 5
Physical Drive Information
Channel 0
381549MB drive ID 1
CoerSZ: 781412352(Sectors) 381549(MB) RawSZ: 781422255(Sectors)
381549MB drive ID 2
CoerSZ: 781412352(Sectors) 381549(MB) RawSZ: 781422255(Sectors)
381549MB drive ID 3
CoerSZ: 781412352(Sectors) 381549(MB) RawSZ: 781422255(Sectors)
381549MB drive ID 4
CoerSZ: 781412352(Sectors) 381549(MB) RawSZ: 781422255(Sectors)
381549MB drive ID 5
CoerSZ: 781412352(Sectors) 381549(MB) RawSZ: 781422255(Sectors)
megarc -ScfgAndParm|-DfcfgAndParm|-RcfgAndParm -fFileName -a0
Save, Display, or Restore the configuration and parameters for adapter 0, in FileName. FileName stores the same output provided by -dispCfg is a binary format, and makes it possible to directly load the stored configuration.
megarc -physOn pd[c0:t0,c1:t1....] -a0
Set the state of the designated drive(s) to Online.
pd[c:t] refers to at least one physical drive by channel and target. -aN here as elsewere is the adapter number [required]
If the physical drive does not exist or if it isn't in failed state, the utility exits with no harm done.
An example of this command under our present configuration would be: megarc -physOn -a0 pd[0:1]
megarc -phys -chAll -idAll -a0
Show the physical drive description for each device on all channels managed by adapter 0
Adapter 0, Channel 0, Target ID 1
Type: DISK Vendor : WDC
Product: WD4000KD-00NAB0 Revision : 01.0
Synchronous : No Wide-32 : No Wide-16: No
LinkCmdSupport: No TagQ support: No RelAddr: No
Removable : No SoftReset : No AENC : No
etc...
megarc -physdrvSerialInfo -chAll -idAll -a0
Show the serial number for each physical drive on each channel for all serial devices managed by adapter 0 (This doesn't look correct or helpful).
Adapter 0, Channel 0, Target ID 1 PhysDrvSerial#: WD-W
megarc -pdFailInfo -chAll -idAll -a0
Show the failure history for each device on all channels managed by adapter 0.
megarc -setRbldRate|-getRbldRate -a0
Get the rebuild rate for adapter 0.
********************************************************************** RebuildRate of Adapter-0 is 30 **********************************************************************
megarc -ctlrInfo -a0
Display information about adapter 0.
********************************************************************** Information of Adapter-0 (#Adapter(s) on system: 1) ********************************************************************** Firmware Version : 713N BIOS Version : G119 Logical Drives : 01 DRAM : 64MB Rebuild Rate : 30% Flush Interval : 4 secs Number Of Chnls : 1 Bios Status : Enabled Alarm State : Enabled Auto Rebuild : Enabled FW : SPAN-8, 40-LD BIOS Config AutoSelection : USER BIOS Echos Mesg : ON BIOS Stops On Error : ON Initiator Id : 16(Clustered Firmware) Board SN: -17179869 **********************************************************************
megarc -getXFerRate|-setXFerRate -a0 -chAll
Get or set the transfer rate for all channels on adapter 0.
********************************************************************** Transfer Rate of Adapter-0 Channel-8 is 160M **********************************************************************
