Linuxdoc Linux Questions
Click here to ask our community of linux experts!
Custom Search
Next Previous Contents

5. Configuring the Production RAID system.

5.1 System specs. Two systems with identical motherboards were configured.

                                  Raid-1          Raid-5
Motherboard:    Iwill P55TU     dual ide        adaptec scsi
Processor:      Intel P200
Disks:                          2ea  7 gig      4 ea Segate 4.2 gig
                                Maxtors         wide scsii
The disk drives are designated by linux as 'sda' through 'sdd' on the raid5 system and 'hda' and 'hdc' on the raid1 system.

5.2 Partitioning the hard drives.

Since testing a large root mountable RAID array is difficult because of the ckraid re-boot problem, I re-partitioned my swap space to include a smaller RAID partition for testing purposes, sda6,sdb6,sdc6,sdd6, and a small root and /usr/src partition pair for developing and testing the raid kernel and tools. You may find this helpful.

        <bf/DEVELOPMENT SYSTEM - RAID5/
   Device       System          Size    Purpose

  /dev/sda1     dos boot        16 meg  boot partition
* /dev/sda2     extended        130 meg (see below)
  /dev/sda3     linux native    4 gig   primary raid5-1
----------------------sda2------------------------------
* /dev/sda5     linux swap      113 meg SWAP space
* /dev/sda6     linux native    16 meg  test raid5-1
========================================================
  /dev/sdb1     dos boot        16 meg  boot partition duplicate
* /dev/sdb2     extended        130 meg (see below)
  /dev/sdb3     linux native    4 gig   primary raid5-2
----------------------sdb2------------------------------
* /dev/sdb5     linux swap      113 meg SWAP space
* /dev/sdb6     linux native    16 meg  test raid5-2
========================================================
* /dev/sdc2     extended        146 meg (see below)
  /dev/sdc3     linux native    4 gig   primary raid5-3
----------------------sdc2------------------------------
* /dev/sdc5     linux swap      130 meg development root partition
* /dev/sdc6     linux native    16 meg  test raid5-3
========================================================
* /dev/sdd2     extended        146 meg (see below)
  /dev/sdd3     linux native    4 gig   primary raid5-4
----------------------sdd2------------------------------
* /dev/sdd5     linux swap      130 meg development /usr/src
* /dev/sdd6     linux native    16 meg  test raid5-4


        <bf/DEVELOPMENT SYSTEM - RAID1/
   Device       System          Size    Purpose

  /dev/hda1     dos             16meg   boot partition
* /dev/hda2     extended        126m    (see below)
  /dev/hda3     linux           126m    development root partition
  /dev/hda4     linux           6+gig   raid1-1
----------------------hda2------------------------------
* /dev/hda5     linux            26m    test raid1-1
* /dev/hda6     linux swap      100m
========================================================

  /dev/hdc1     is simply an exact copy of hda1 so the
                partion can be made active if hda fails
* /dev/hdc2     extended        126m    (see below)
  /dev/hdc3     linux           126m    development /usr/src
  /dev/hdc4     linux           6+gig   raid1-2
----------------------hdc2------------------------------
* /dev/hdc5     linux            26m    test raid1-2
* /dev/hdc6     linux swap      100m
The sdx2 and hdx3 partitions were switched to 'swap' after developing this utility. I could have done it on another machine, however, the libraries and kernels are all about a year or more out of date on my other linux boxes and I preferred to build it on the target machine.

The partitioning scheme was chosen so that in the event that any one of the drives fails catastrophically, the system will continue to run and be bootable with minimum effort and NO data loss.


Next Previous Contents