linux software raid 5 quick guide - Revision history

Nighthawk: /* checking status */

2016-06-12T14:43:11Z

‎checking status

2016-06-12T14:42:52Z

‎checking status

2016-06-12T14:41:57Z

2014-03-30T21:36:57Z

2014-03-30T21:27:27Z

‎Creating an array

2014-03-30T19:40:08Z

2014-03-30T19:36:18Z

‎prepare disks

2014-03-30T19:35:47Z

‎prepare disks

2014-03-30T19:35:29Z

‎prepare disks

2014-03-30T19:32:38Z

‎prepare disks

@@ Line 133: / Line 133: @@
           <br>Layout : left-symmetric
       Chunk Size : 512K
+            <br>Name : nasser:0  (local to host nasser)
             Name : nasser:0  (local to host nasser)
             UUID : 3733be79:728f962f:ffe10ec0:ce451bb3
           Events : 28933

@@ Line 125: / Line 125: @@
    Total Devices : 3
      Persistence : Superblock is persistent
+     <br>Update Time : Sat Jun 11 16:37:45 2016
      Update Time : Sat Jun 11 16:37:45 2016
            State : clean
   Active Devices : 3
@@ Line 132: / Line 131: @@
   Failed Devices : 0
    Spare Devices : 0
+          <br>Layout : left-symmetric
           Layout : left-symmetric
       Chunk Size : 512K
@@ Line 139: / Line 137: @@
             UUID : 3733be79:728f962f:ffe10ec0:ce451bb3
           Events : 28933
+     <br>Number   Major   Minor   RaidDevice State
      Number   Major   Minor   RaidDevice State
        8       17        0      active sync   /dev/sdb1
        8       33        1      active sync   /dev/sdc1
        8       49        2      active sync   /dev/sdd1
 == Links ==

@@ Line 113: / Line 113: @@
   /dev/md0                /vol1           ext4            defaults        0 0
+==checking status==
 == Links ==

@@ Line 103: / Line 103: @@
 if you care to watch / monitor the sync in a terminal
   # while true; do cat /proc/mdstat | grep recovery; sleep 300; done
 == Links ==

← Older revision		Revision as of 21:27, 30 March 2014
Line 89:		Line 89:
	== Creating an array ==		== Creating an array ==

		+	# '''mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1'''
		+
		+	verify the creation
		+
		+	# '''cat /proc/mdstat'''
		+	Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] [multipath] [faulty]
		+	md0 : active raid5 sdd1[3] sdc1[1] sdb1[0]
		+	1953260544 blocks super 1.2 level 5, 512k chunk, algorithm 2 [3/2] [UU_]
		+	[>....................] recovery = 0.1% (1143808/976630272) finish=312.6min speed=51991K/sec
		+
		+	if you see something similar to above you are OK. the recover = xx.x% is the initial building of the parity data I believe.
		+
		+	if you care to watch / monitor the sync in a terminal
		+	# while true; do cat /proc/mdstat \| grep recovery; sleep 300; done

	== Links ==		== Links ==

@@ Line 2: / Line 2: @@
 Number of drives: 3
 Number of spare drives: 0
 All drives same size
 All space used on all drives
 devices to be used in this example: sdb sdc sdd

@@ Line 24: / Line 24: @@
   # '''fdisk -l /dev/sd[bcd]'''
-Assumming you have 3 drives with no data to preserve or they are new, delete the existing partions in preparation for creating new partitions of type "Linux raid autodetect"
+Assumming you have 3 drives with no data to preserve or they are new, delete any existing partions in preparation for creating new partitions of type "Linux raid autodetect"
 '''create three raid partions'''

← Older revision		Revision as of 19:35, 30 March 2014
Line 24:		Line 24:
	# '''fdisk -l /dev/sd[bcd]'''		# '''fdisk -l /dev/sd[bcd]'''

		+	Assumming you have 3 drive with no data to preserve or they are new, delete the existing partions in preparation for creating new partitions of type "Linux raid autodetect"

	'''create three raid partions'''		'''create three raid partions'''

← Older revision		Revision as of 19:32, 30 March 2014
Line 58:		Line 58:
	Syncing disks.		Syncing disks.

		+	Duplicate the sdb partition tables to sdc and sdd. You can re-run fdisk two more times, or just run this.
		+	# sfdisk -d /dev/sdb \| sfdisk /dev/sdc; sfdisk -d /dev/sdb \| sfdisk /dev/sdd

		+	'''Verify the partition layout'''

		+	Partitions should look similar to the following:

		+	# '''fdisk -l /dev/sd[bcd] \| grep -A 1 Device'''
		+	Device Boot Start End Blocks Id System
		+	/dev/sdb1 2048 1953525167 976761560 fd Linux raid autodetect
		+	--
		+	Device Boot Start End Blocks Id System
		+	/dev/sdc1 2048 1953525167 976761560 fd Linux raid autodetect
		+	--
		+	Device Boot Start End Blocks Id System
		+	/dev/sdd1 2048 1953525167 976761560 fd Linux raid autodetect

	== Creating an array ==		== Creating an array ==