Linux Software RAID and SATA Hot Swap - Revision history

Casey at 14:42, 19 May 2025

2025-05-19T14:42:19Z

2025-05-19T14:38:51Z

2025-05-19T14:29:46Z

2024-04-20T04:19:49Z

Rebuilding The Array

2024-04-15T19:50:02Z

Fiasco #3: The Surprise Array

2023-10-01T04:22:13Z

Update: Identifying The Serial Number Of A Drive

2023-10-01T04:21:58Z

Update: Identifying The Serial Number Of A Drive

2023-10-01T04:21:40Z

Update: Identifying The Serial Number Of A Drive

2023-10-01T04:21:12Z

2023-09-30T15:54:39Z

Update: Reusing Disks From A Hardware RAID Controller

@@ Line 418: / Line 418: @@
 ''Update: This can be done with one CLI command'':
 <PRE>
-mdadm --grow /dev/md124 --level=5 --raid-devices=4 --add /dev/sdf1
+mdadm --grow /dev/md124 --raid-devices=4 --add /dev/sdf1
 </PRE>
@@ Line 433: / Line 433: @@
 [root@fileserver ~]# xfs_growfs /dev/md124
 </PRE>
 ==Update: Reusing Disks From A Hardware RAID Controller==

@@ Line 419: / Line 419: @@
 <PRE>
 mdadm --grow /dev/md124 --level=5 --raid-devices=4 --add /dev/sdf1
 </PRE>

← Older revision		Revision as of 14:29, 19 May 2025
Line 414:		Line 414:

	unused devices: <none>		unused devices: <none>
		+	</PRE>
		+
		+	''Update: This can be done with one CLI command'':
		+	<PRE>
		+	mdadm --grow /dev/md124 --level=5 --raid-devices=4 --add /dev/sdf1
		+	parted /dev/sda mklabel gpt unit TB mkpart primary 0.00TB 2.00TB
	</PRE>		</PRE>

@@ Line 104: / Line 104: @@
 (parted) quit
 </PRE>
 * Do the same thing on the second drive
 * Create the array
@@ Line 142: / Line 148: @@
 </PRE>
 The 0.5 is the percentage of the drive.  It can be any integer or decimal.
 ==Fiasco #2:  The 2TB Array==

@@ Line 223: / Line 223: @@
 * In parted, I set the unit as TB instead of GB, as I was working with 3TB drives.
 * To create the array, I used this command:
 <PRE>
-mdadm --create --verbose /dev/md0 --level=5 --metadata=1.2 --raid-devices=3 /dev/sdc1 /dev/sdd1 /dev/sdg1
+mdadm --create --verbose /dev/md0 --level=5 --metadata=1.2 --raid-devices=3 --spare-devices=0 /dev/sdc1 /dev/sdd1 /dev/sdg1
 </PRE>
 * I added it to the mdadm.conf file like this:
@@ Line 259: / Line 263: @@
 <PRE>
 ARRAY /dev/md0 level=raid5 num-devices=3 metadata=1.02 spares=0 name=0 UUID=0036f465:a16a0eb0:2c35cd8e:079dfacb</PRE>
 ==Dénouement==

← Older revision		Revision as of 04:22, 1 October 2023
Line 454:		Line 454:

	==Update: Identifying The Serial Number Of A Drive==		==Update: Identifying The Serial Number Of A Drive==
		+	<PRE>
	udevadm info --query=all --name=/dev/sda \| grep ID_SERIAL		udevadm info --query=all --name=/dev/sda \| grep ID_SERIAL
		+	</PRE>

← Older revision		Revision as of 04:21, 1 October 2023
Line 454:		Line 454:

	==Update: Identifying The Serial Number Of A Drive==		==Update: Identifying The Serial Number Of A Drive==
−	~~<PRE>~~
	udevadm info --query=all --name=/dev/sda \| grep ID_SERIAL		udevadm info --query=all --name=/dev/sda \| grep ID_SERIAL
−	~~</PRE>~~

← Older revision		Revision as of 04:21, 1 October 2023
Line 452:		Line 452:
	no raid disks		no raid disks
	</PRE>		</PRE>
		+
		+	==Update: Identifying The Serial Number Of A Drive==
		+	udevadm info --query=all --name=/dev/sda \| grep ID_SERIAL

@@ Line 422: / Line 422: @@
 ==Update: Reusing Disks From A Hardware RAID Controller==
 dmraid -r -E /dev/sdc
 If that returns errors, use this:
 dmraid -r
 dd if=/dev/zero of=/dev/sdc bs=512 seek=$(( $(blockdev --getsz /dev/sdc) - 1024 ))
 dmraid -r
+</PRE>
 <PRE style="color:white;background-color:black;font-weight:bold;font-size:1.2em;">