Logical Volume Management - Revision history

Michael.mast at 21:07, 25 October 2020

2020-10-25T21:07:15Z

Michael.mast at 15:30, 9 May 2020

2020-05-09T15:30:38Z

Michael.mast: /* Read Cache */

2020-05-09T15:26:56Z

Read Cache

Michael.mast at 15:25, 9 May 2020

2020-05-09T15:25:18Z

Michael.mast: /* Create Mirrored Volume */

2020-02-17T14:02:20Z

Create Mirrored Volume

Michael.mast: /* Steps */

2019-10-24T22:58:13Z

Steps

Michael.mast: /* Create Mirrored Volume */

2019-10-24T22:55:04Z

Create Mirrored Volume

Michael.mast at 22:42, 24 October 2019

2019-10-24T22:42:34Z

Michael.mast: /* Grow logical volume */

2018-06-04T14:00:32Z

Grow logical volume

Michael.mast: Created page with "==Grow logical volume== ===Purpose=== A couple small servers I had built using the vmware defaults started to run out of space, and everytime this happens I fail to record the..."

2018-03-31T16:19:12Z

Created page with "==Grow logical volume== ===Purpose=== A couple small servers I had built using the vmware defaults started to run out of space, and everytime this happens I fail to record the..."

New page

==Grow logical volume==
===Purpose===
A couple small servers I had built using the vmware defaults started to run out of space, and everytime this happens I fail to record the steps and have to look up a refresher. This time I will record it.
===Steps===
NOTE: The following uses defaults. If you need to look up specific information on your system, use vgdisplay and lvdisplay.
*Create a new partition on the disk
<pre>fdisk /dev/sda
Welcome to fdisk (util-linux 2.23.2).

Changes will remain in memory only, until you decide to write them.
Be careful before using the write command.

Command (m for help): p

Disk /dev/sda: 21.5 GB, 21474836480 bytes, 41943040 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk label type: dos
Disk identifier: 0x000606ed

Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 20971519 9972736 8e Linux LVM

Command (m for help): n
Partition type:
p primary (2 primary, 0 extended, 2 free)
e extended
Select (default p):
Using default response p
Partition number (3,4, default 3):
First sector (20971520-41943039, default 20971520):
Using default value 20971520
Last sector, +sectors or +size{K,M,G} (20971520-41943039, default 41943039):
Using default value 41943039
Partition 3 of type Linux and of size 10 GiB is set

Command (m for help): w
The partition table has been altered!

Calling ioctl() to re-read partition table.

WARNING: Re-reading the partition table failed with error 16: Device or resource busy.
The kernel still uses the old table. The new table will be used at
the next reboot or after you run partprobe(8) or kpartx(8)
Syncing disks.
</pre>
*Run partprobe so kernel knows of new partition.
*Add the partition as a physical parition for LVM
<pre>pvcreate /dev/sda3</pre>
*Add the new physical volume to the volume group
<pre>vgextend centos /dev/sda3</pre>
*Extend the logical volume
<pre>lvextend /dev/centos/root /dev/sda3</pre>

@@ Line 63: / Line 63: @@
 </pre>
 ==Create Cache==
 <ref>http://man7.org/linux/man-pages/man7/lvmcache.7.html</ref>Working off the mirror LVM created previsouly, I needed to increase performance on these SMR drives. I had an NVME drive connected via USB 3.0 that would work for now.

← Older revision		Revision as of 15:30, 9 May 2020
Line 1:		Line 1:
		+	==Notes==
		+	*If you make changes on the fly, and are unable to mount volumes, try "systemctl daemon-reload" first.
		+
	==Create Mirrored Volume==		==Create Mirrored Volume==
	===Purpose===		===Purpose===

@@ Line 70: / Line 70: @@
 lvcreate -n cache-read -L 100GB DATA /dev/sda1
 lvconvert --type cache --cachevol cache-read --chunksize=256 DATA/mirror1
 </pre>

← Older revision		Revision as of 15:25, 9 May 2020
Line 58:		Line 58:
	Mismatches		Mismatches
	0		0
		+	</pre>
		+
		+	==Create Cache==
		+	<ref>http://man7.org/linux/man-pages/man7/lvmcache.7.html</ref>Working off the mirror LVM created previsouly, I needed to increase performance on these SMR drives. I had an NVME drive connected via USB 3.0 that would work for now.
		+	<br>
		+	===Read Cache===
		+	<pre>
		+	pvcreate /dev/sda1
		+	vgextend DATA /dev/sda1
		+	lvcreate -n cache-write -L 50GB DATA /dev/sda1
		+	lvcreate -n cache-read -L 100GB DATA /dev/sda1
		+	lvconvert --type cache --cachevol cache-read --chunksize=256 DATA/mirror1
	</pre>		</pre>

@@ Line 44: / Line 44: @@
 tmpfs                     770M     0  770M   0% /run/user/0
 /dev/mapper/DATA-mirror1  3.6T   89M  3.4T   1% /data
 </pre>

@@ Line 14: / Line 14: @@
    Rounding up size to full physical extent 3.63 TiB
    Logical volume "mirror1" created.
 </pre>

@@ Line 3: / Line 3: @@
 To mirror two 4TB disks.
 ===Steps===
 ==Fix excluded by filter==

← Older revision		Revision as of 22:42, 24 October 2019
Line 1:		Line 1:
		+	==Create Mirrored Volume==
		+	===Purpose===
		+	To mirror two 4TB disks.
		+	===Steps===
		+
		+	==Fix excluded by filter==
		+	<ref>https://www.simplstor.com/index.php/support/support-faqs/118-lvm-dev-excluded-by-filter</ref>
		+	<pre>
		+	[root@natasha ~]# wipefs -a /dev/sdb
		+	/dev/sdb: 8 bytes were erased at offset 0x00000200 (gpt): 45 46 49 20 50 41 52 54
		+	/dev/sdb: 8 bytes were erased at offset 0x3a3817d5e00 (gpt): 45 46 49 20 50 41 52 54
		+	/dev/sdb: 2 bytes were erased at offset 0x000001fe (PMBR): 55 aa
		+	/dev/sdb: calling ioctl to re-read partition table: Success
		+	</pre>
		+
	==Grow logical volume==		==Grow logical volume==
	===Purpose===		===Purpose===

← Older revision		Revision as of 14:00, 4 June 2018
Line 55:		Line 55:
	*Extend the logical volume		*Extend the logical volume
	<pre>lvextend /dev/centos/root /dev/sda3</pre>		<pre>lvextend /dev/centos/root /dev/sda3</pre>
		+	===VMWare Specific===
		+	To detect a resized disk running on VMWare, you need to scan the scsi controller before expanding the volume.<ref>https://communities.vmware.com/thread/492752</ref>
		+	<pre>
		+	echo 1 > /sys/class/scsi_device/0\:0\:0\:0/device/rescan
		+	</pre>