Mirroring Disks - Revision history

Ppapa at 01:27, 18 June 2012

2012-06-18T01:27:22Z

2011-01-13T05:00:53Z

‎CentOS/RedHat

2011-01-13T04:56:11Z

‎CentOS/RedHat

2011-01-13T04:55:19Z

‎CentOS/RedHat

2010-11-15T00:55:35Z

‎Solaris:

2010-11-11T04:50:24Z

‎CentOS/RedHat

2010-11-11T04:44:25Z

‎CentOS/RedHat

2010-11-11T04:28:16Z

‎CentOS/RedHat

2010-11-11T04:24:06Z

‎CentOS/RedHat

2010-11-11T03:57:22Z

‎CentOS/RedHat

@@ Line 36: / Line 36: @@
     metainit -f d10 1 1 c1t0d0s0
-    metainit -f d10 1 1 c1t0d0s1
+    metainit -f d11 1 1 c1t0d0s1
-    metainit -f d10 1 1 c1t0d0s3
+    metainit -f d13 1 1 c1t0d0s3
-    metainit -f d10 1 1 c1t0d0s4
+    metainit -f d14 1 1 c1t0d0s4
-    metainit -f d10 1 1 c1t0d0s5
+    metainit -f d15 1 1 c1t0d0s5
-    metainit -f d10 1 1 c1t0d0s6
+    metainit -f d16 1 1 c1t0d0s6
     metainit d0 -m d10
     metainit d1 -m d11

← Older revision		Revision as of 05:00, 13 January 2011
Line 297:		Line 297:

	mdadm --detail --scan > /etc/mdadm.conf		mdadm --detail --scan > /etc/mdadm.conf
−
−
−	~~ARRAY /dev/md0 level=raid1 num-devices=2 UUID=98b0f3a8:e65cf4ba:78362d52:4149fec6~~
−	~~ARRAY /dev/md1 level=raid1 num-devices=2 UUID=ad326160:3c07ea40:2743f05c:01d0ba7d~~
−	~~ARRAY /dev/md2 level=raid1 num-devices=2 UUID=90db8ba9:a813a3b1:5773fe4e:92575c88~~
−	~~ARRAY /dev/md3 level=raid1 num-devices=2 UUID=1b3b7297:80b9ffc4:9bf9523a:b9249fe4~~
−	~~ARRAY /dev/md4 level=raid1 num-devices=2 UUID=7a1f48f9:847a1414:07e67ace:0f90e882~~
−	~~ARRAY /dev/md5 level=raid1 num-devices=2 UUID=76f18601:8d99c321:b2af7455:316847af~~

	10. Make a mount point and mount all the partitions:		10. Make a mount point and mount all the partitions:

@@ Line 146: / Line 146: @@
    Model: FUJITSU MAV2073RCSUN72G (scsi)
    Disk /dev/sda: 73.4GB
-   Sector size (logical/physical): 512B/512BARRAY /dev/md0 level=raid1 num-devices=2 UUID=98b0f3a8:e65cf4ba:78362d52:4149fec6
+   Sector size (logical/physical): 512B/512B
    Partition Table: msdos

@@ Line 280: / Line 280: @@
    md2 : active raid1 sdb3[1]
          8385856 blocks [2/1] [_U]
-       ARRAY /dev/md0 level=raid1 num-devices=2 UUID=98b0f3a8:e65cf4ba:78362d52:4149fec6
    md1 : active raid1 sdb2[1]
          8385856 blocks [2/1] [_U]
@@ Line 307: / Line 302: @@
    mdadm --detail --scan > /etc/mdadm.conf
 . Make a mount point and mount all the partitions:

← Older revision		Revision as of 00:55, 15 November 2010
Line 92:		Line 92:

	installboot /usr/platform/`uname -i`/lib/fs/ufs/bootblk /dev/rdsk/c1t1d0s0		installboot /usr/platform/`uname -i`/lib/fs/ufs/bootblk /dev/rdsk/c1t1d0s0
		+
		+	'''NOTE:''' If you get this error with the installboot command
		+
		+	dd: unrecognized operand `oseek'=`1' Try `dd --help' for more information.
		+
		+	then it is using the wrong version of 'dd'. Change your PATH to put /usr/bin/dd first in your PATH.

	11. Disable the following in /etc/inetd.conf		11. Disable the following in /etc/inetd.conf

@@ Line 509: / Line 509: @@
 so that it looks like this:
+   title CentOS (2.6.18-194.26.1.el5 Disk 1)
 . Now finally update the ramdisk one more time

@@ Line 107: / Line 107: @@
 == CentOS/RedHat ==
-OK, so software RAID on CentOS/RedHat sucks!  Unless you build the box from the outset with mirrored disk, you're going to need to do a lot of work to get to a point where you're going to be happy.  Wherever possible, mirror the disks during build!  However, if the box is already built and you need to mirror the boot disk after the fact, here's how you do it:
+OK, so software RAID on CentOS/RedHat sucks!  Unless you build the box from the outset with mirrored disk, you're going to need to do a lot of work to get to a point where you're going to be happy.  Wherever possible, mirror the disks during build!  However, if the box is already built and you need to mirror the boot disk after the fact, here's how you do it.  I have tested this on CentOS 5.5.
 This is a worked example that uses the following disk layout:

← Older revision		Revision as of 04:28, 11 November 2010
Line 106:		Line 106:

	== CentOS/RedHat ==		== CentOS/RedHat ==
−
−	~~'''DON'T USE THESE INSTRUCTIONS! I have yet to make them work properly!'''~~

	OK, so software RAID on CentOS/RedHat sucks! Unless you build the box from the outset with mirrored disk, you're going to need to do a lot of work to get to a point where you're going to be happy. Wherever possible, mirror the disks during build! However, if the box is already built and you need to mirror the boot disk after the fact, here's how you do it:		OK, so software RAID on CentOS/RedHat sucks! Unless you build the box from the outset with mirrored disk, you're going to need to do a lot of work to get to a point where you're going to be happy. Wherever possible, mirror the disks during build! However, if the box is already built and you need to mirror the boot disk after the fact, here's how you do it:

← Older revision		Revision as of 03:57, 11 November 2010
Line 441:		Line 441:

	fdisk /dev/sda		fdisk /dev/sda
		+
		+	The number of cylinders for this disk is set to 8924.
		+	There is nothing wrong with that, but this is larger than 1024,
		+	and could in certain setups cause problems with:
		+	1) software that runs at boot time (e.g., old versions of LILO)
		+	2) booting and partitioning software from other OSs
		+	(e.g., DOS FDISK, OS/2 FDISK)
		+
		+	Command (m for help): t
		+	Partition number (1-7): 1
		+	Hex code (type L to list codes): fd
		+	Changed system type of partition 1 to fd (Linux raid autodetect)
		+
		+	Command (m for help): t
		+	Partition number (1-7): 2
		+	Hex code (type L to list codes): fd
		+	Changed system type of partition 2 to fd (Linux raid autodetect)
		+	.
		+	.
		+	.
		+	Command (m for help): w
		+	The partition table has been altered!
		+
		+	Calling ioctl() to re-read partition table.
		+	Syncing disks.

	21. Add the disk 1 partitions to the meta devices		21. Add the disk 1 partitions to the meta devices