Pages

Wednesday, April 25, 2018

Creating a new filesystem with fdisk lvm and mkfs

Creating a new filesystem with fdisk lvm and mkfs


Our Task: Create a new 10GB filesystem to store a package repository for yum

Challenges: The existing hard drive has been fully allocated using LVM.
Solution:
  • Add a new hard drive to the server (virtual server in this case)
  • Partition the drive and add it to the main logical volume
  • Create a new filesystem

This article assumes that by now you have physically added the hard drive to the server. In my case I am using a virtual server but the tasks are essentially the same.

Partition the new disk drive

Before starting I will verify there are no partitions on the new disk.
[root@fedora-test ~]# fdisk -l /dev/sdb 

Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 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 identifier: 0x00000000
Disk /dev/sdb doesnt contain a valid partition table
Since there are no partitions it is safe to proceed. I will now create one big partition as I plan to add this disk to LVM and use LVM to divvy up my disk space.
[root@fedora-test ~]# fdisk /dev/sdb
Device contains neither a valid DOS partition table, nor Sun, SGI or OSF disklabel
Building a new DOS disklabel with disk identifier 0xe1410716.
Changes will remain in memory only, until you decide to write them.
After that, of course, the previous content wont be recoverable.

Warning: invalid flag 0x0000 of partition table 4 will be corrected by w(rite)

Command (m for help): n
Partition type:
 p primary (0 primary, 0 extended, 4 free)
 e extended
Select (default p): p
Partition number (1-4, default 1):
Using default value 1
First sector (2048-41943039, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-41943039, default 41943039):
Using default value 41943039
Command (m for help): p

Disk /dev/sdb: 21.5 GB, 21474836480 bytes
255 heads, 63 sectors/track, 2610 cylinders, total 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 identifier: 0xe1410716

 Device Boot Start End Blocks Id System
/dev/sdb1 2048 41943039 20970496 83 Linux

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

Calling ioctl() to re-read partition table.
Syncing disks.
Once you type w the changes are written to disk.
Add the partition to the volume group
My volume group name is vg_fedoratest and I will now add the new partition to that volume group with the vgextend command. This adds the additional partition space to the volume group for lvm to use.
[root@fedora-test ~]# ls -la /dev/sdb*
brw-rw----. 1 root disk 8, 17 april 6 15:08 /dev/sdb
brw-rw----. 1 root disk 8, 18 april 6 15:08 /dev/sdb1
[root@fedora-test ~]# pvcreate /dev/sdb1
[root@fedora-test ~]# vgextend vg_fedoratest /dev/sdb1
 No physical volume label read from /dev/sdb1
 Writing physical volume data to disk "/dev/sdb1"
 Physical volume "/dev/sdb1" successfully created
 Volume group "vg_fedoratest" successfully extended
 [root@fedora-test ~]# vgdisplay vg_fedoratest
 --- Volume group ---
 VG Name vg_fedoratest
 System ID
 Format lvm2
 Metadata Areas 2
 Metadata Sequence No 4
 VG Access read/write
 VG Status resizable
 MAX LV 0
 Cur LV 2
 Open LV 2
 Max PV 0
 Cur PV 2
 Act PV 2
 VG Size 40.69 GiB
 PE Size 32.00 MiB
 Total PE 1302
 Alloc PE / Size 663 / 20.72 GiB
 Free PE / Size 639 / 19.97 GiB
 VG UUID 0gvY4O-I3tT-WKK0-ClU2-sXDz-Nq0c-eExZz2
Create a logical volume & filesystem
I am first using lvcreate to create the logical volume, after verifying that the logical volume created correctly I will create a new filesystem on top with mkfs.
[root@fedora-test ~]# lvcreate -L 10GB -n lv_yumrepo vg_fedoratest
 Logical volume "lv_yumrepo" created
[root@fedora-test ~]# lvdisplay vg_fedoratest/lv_yumrepo
 --- Logical volume ---
 LV Name /dev/vg_fedoratest/lv_yumrepo
 VG Name vg_fedoratest
 LV UUID rpl7q1-oi6N-nZot-bjPT-Y1qi-2W28-xlBg6Q
 LV Write Access read/write
 LV Status available
 # open 0
 LV Size 10.00 GiB
 Current LE 320
 Segments 1
 Allocation inherit
 Read ahead sectors auto
 - currently set to 256
 Block device 253:2
 [root@fedora-test ~]# mkfs -t ext3 /dev/vg_fedoratest/lv_yumrepo
mke2fs 1.41.14 (23-april-2013)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
655360 inodes, 2621440 blocks
131072 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=2684354560
80 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
 32768, 98304, 163840, 229376, 294912, 819200, 884736, 1605632

Writing inode tables: done
Creating journal (32768 blocks): done
Writing superblocks and filesystem accounting information: done

This filesystem will be automatically checked every 28 mounts or
180 days, whichever comes first. Use tune2fs -c or -i to override.
Mount the filesystem
Now that my filesystem is created I need to mount it; but before then I need to create the directory that the mount point will overlay and add the appropriate lines to the /etc/fstab file.
[root@fedora-test ~]# mkdir /var/repo
[root@fedora-test ~]# vi /etc/fstab
 ## Append to bottom
 /dev/mapper/vg_fedoratest-lv_yumrepo /var/repo ext3 defaults 0 0
[root@fedora-test ~]# mount
/dev/mapper/vg_fedoratest-lv_yumrepo on /var/repo type ext3 (rw,relatime,seclabel,user_xattr,acl,barrier=1,nodelalloc,data=ordered)


visit link download 










Posted by



at





































No comments:















Post a Comment






Note: Only a member of this blog may post a comment.














        

      









Subscribe to:
Post Comments (Atom)