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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
Old 08-17-2010
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.
 

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RAIDFILE-CONFIG(8)						    Box Backup							RAIDFILE-CONFIG(8)

NAME
raidfile-config - Configure Box Backup's RAID files SYNOPSIS
raidfile-config config-dir blocksize dir1 [dir2 [dir3]] DESCRIPTION
raidfile-config creates a raidfile.conf file for Box Backup. This file holds information about the directories used to store backups in. Box Backup supports userland RAID, in a restricted RAID5 configuration, where 3 and only 3 'drives' are supported. You can read more about RAID5 (and other RAID-levels) here[1]. Parameters The parameters are as follows: config-dir The directory path where configuration files are located. Usually this is /etc/box. raidfile.conf will be written in this directory. blocksize The block size used for file storage in the system, in bytes. Using a multiple of the file system block size is a good strategy. Depending on the size of the files you will be backing up, this multiple varies. Of course it also depends on the native block size of your file system. dir1 The first directory in the built-in RAID array. dir2 The second directory in the built-in RAID array. If you are not using the built-in RAID functionality, this field should be ignored. 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). dir3 The third directory in the built-in RAID array. The same notes that apply to dir2 also apply to dir3. Note that there are currently no way to add multiple disk sets to the raidfile.conf file using command line tools, etc. See raidfile.conf(5) for details on adding more disks. BUGS
If you find a bug in Box Backup, and you want to let us know about it, join the mailing list[2], and send a description of the problem there. To report a bug, give us at least the following information: o The version of Box Backup you are running o The platform you are running on (hardware and OS), for both client and server. o If possible attach your config files (bbstored.conf, bbackupd.conf) to the bug report. o Also attach any log file output that helps shed light on the problem you are seeing. o And last but certainly not least, a description of what you are seeing, in as much detail as possible. FILES
raidfile-config generates the raidfile.conf(5) file. SEE ALSO
bbstored-config(8), bbstored.conf(5), raidfile.conf(5) AUTHORS
Ben Summers Per Thomsen James O'Gorman NOTES
1. here http://en.wikipedia.org/wiki/Redundant_array_of_independent_disks#RAID_5 2. mailing list http://lists.warhead.org.uk/mailman/listinfo/boxbackup Box Backup 0.11 10/28/2011 RAIDFILE-CONFIG(8)
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