Setting up bootblock on RAID 0 SVM Post: 302445795

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Operating Systems Solaris Setting up bootblock on RAID 0 SVM Post 302445795 by hergp on Tuesday 17th of August 2010 01:29:36 AM

08-17-2010

Registered User

Keepcase,

in a raid 1 (no matter how many disks you have in it), every subdisk (diskslice) is identical to the others and to the raidset itself. Therefore every subdisk in a raid 1 has the full information of the filesystem built on top of the raidset. As long as you do not update the filesystem (mount it read/write), you can use a subdisk instead of the raidset without messing things up.

What happens when the system boots (from a ufs root filesystem) is this:
The OBP reads the bootblock from one of the disks (the details are configured in the OBP), then the bootblock loads a secondary bootloader called ufsboot, which loads the kernel and essential drivers. Later, when the kernel has enough information to understand mirrored disks, it switches from using the subdisk to the mirrored logical volume for the root filesystem.

When the root filesystem is scattered over more than one disk, all this is not possible (at least as long as OBP has no builtin means to understand logical volumes).

I hope, this helps to shed some light on the boot process with logical volumes.

hergp

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raidfile.conf

RAIDFILE.CONF(5)						    Box Backup							  RAIDFILE.CONF(5)

NAME

       raidfile.conf - Userland RAID for Box Backup

SYNOPSIS

       /etc/box/raidfile.conf

DESCRIPTION

       The raidfile.conf is usually generated by raidfile-config(8) but may be manually edited if the store locations move or if more than one
       disc set is required.

       discX
	   Specifies a set of discs.

	   SetNumber
	       The set number of the RAID disc, referenced by each account.

	   BlockSize
	       The block size of the file system (usually 2048). Under BSD with FFS, set this to your file system's fragment size (most likely an
	       8th of the block size).

	   Dir0
	       The first directory in the RAID array.

	   Dir1
	       The second directory in the RAID array. If you do not wish to use the built-in RAID functionality, this field should be set to the
	       same as Dir0. You should not use the built-in RAID if you have a hardware RAID solution or if you're using another type of software
	       RAID (like md on Linux).

	   Dir2
	       The third directory in the RAID array. The same notes that apply to Dir2 also apply to Dir3.

FILES

       /etc/box/raidfile.conf

SEE ALSO

       raidfile-config(8), bbstored.conf(5)

AUTHORS

       Ben Summers

       Per Thomsen

       James O'Gorman

Box Backup 0.11 						    10/28/2011							  RAIDFILE.CONF(5)