Storage
Default installation on a single disk, which has only free space on you disk or you reclaimed all the occupied space during installation. By default CentOS 6.10 uses.
- ext4 – file system
- lvm – root and swap partitions
- boot, root and home on separate partitions
CentOS 6.10 installation:
-
Disk layout
[root@srv ~]# parted -l Model: ATA KINGSTON SNV425S (scsi) Disk /dev/sda: 128GB Sector size (logical/physical): 512B/512B Partition Table: msdos Number Start End Size Type File system Flags 1 1049kB 525MB 524MB primary ext4 boot 2 525MB 128GB 128GB primary lvm Model: Linux device-mapper (linear) (dm) Disk /dev/mapper/vg_srv-lv_home: 61.0GB Sector size (logical/physical): 512B/512B Partition Table: loop Number Start End Size File system Flags 1 0.00B 61.0GB 61.0GB ext4 Model: Linux device-mapper (linear) (dm) Disk /dev/mapper/vg_srv-lv_swap: 12.8GB Sector size (logical/physical): 512B/512B Partition Table: loop Number Start End Size File system Flags 1 0.00B 12.8GB 12.8GB linux-swap(v1) Model: Linux device-mapper (linear) (dm) Disk /dev/mapper/vg_srv-lv_root: 53.7GB Sector size (logical/physical): 512B/512B Partition Table: loop Number Start End Size File system Flags 1 0.00B 53.7GB 53.7GB ext4
- Mounted Partitions
[root@srv ~]# df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/vg_srv-lv_root 50G 717M 46G 2% / tmpfs 16G 0 16G 0% /dev/shm /dev/sda1 477M 28M 424M 7% /boot /dev/mapper/vg_srv-lv_home 56G 52M 53G 1% /homePartitions in configuration:
[root@srv ~]# cat /etc/fstab # # /etc/fstab # Created by anaconda on Thu Nov 8 16:37:48 2018 # # Accessible filesystems, by reference, are maintained under '/dev/disk' # See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info # /dev/mapper/vg_srv-lv_root / ext4 defaults 1 1 UUID=638bc353-710d-4065-9d5e-842a851a267e /boot ext4 defaults 1 2 /dev/mapper/vg_srv-lv_home /home ext4 defaults 1 2 /dev/mapper/vg_srv-lv_swap swap swap defaults 0 0 UUID=d43a31be-fc8e-4833-b1a1-52678e5be174 swap swap defaults 0 0 tmpfs /dev/shm tmpfs defaults 0 0 devpts /dev/pts devpts gid=5,mode=620 0 0 sysfs /sys sysfs defaults 0 0 proc /proc proc defaults 0 0
- File system layout
[root@srv ~]# ls -al / total 98 dr-xr-xr-x. 22 root root 4096 8 Nov 16,42 . dr-xr-xr-x. 22 root root 4096 8 Nov 16,42 .. -rw-r--r--. 1 root root 0 8 Nov 16,42 .autofsck dr-xr-xr-x. 2 root root 4096 8 Nov 16,39 bin dr-xr-xr-x. 5 root root 1024 8 Nov 16,39 boot drwxr-xr-x. 20 root root 4140 8 Nov 16,42 dev drwxr-xr-x. 63 root root 4096 8 Nov 16,53 etc drwxr-xr-x. 3 root root 4096 23 Sep 2011 home dr-xr-xr-x. 8 root root 4096 8 Nov 16,39 lib dr-xr-xr-x. 9 root root 12288 8 Nov 16,53 lib64 drwx------. 2 root root 16384 8 Nov 16,37 lost+found drwxr-xr-x. 2 root root 4096 23 Sep 2011 media drwxr-xr-x. 2 root root 4096 23 Sep 2011 mnt drwxr-xr-x. 2 root root 4096 23 Sep 2011 opt dr-xr-xr-x. 633 root root 0 8 Nov 16,42 proc dr-xr-x---. 2 root root 4096 8 Nov 16,40 root dr-xr-xr-x. 2 root root 12288 8 Nov 16,53 sbin drwxr-xr-x. 7 root root 0 8 Nov 16,42 selinux drwxr-xr-x. 2 root root 4096 23 Sep 2011 srv drwxr-xr-x 13 root root 0 8 Nov 16,42 sys drwxrwxrwt. 3 root root 4096 8 Nov 16,53 tmp drwxr-xr-x. 13 root root 4096 8 Nov 16,38 usr drwxr-xr-x. 17 root root 4096 8 Nov 16,38 var
- LVM configuration
[root@srv ~]# lvmdiskscan -l WARNING: only considering LVM devices /dev/sda2 [ 118.75 GiB] LVM physical volume 0 LVM physical volume whole disks 1 LVM physical volume [root@srv ~]# pvscan PV /dev/sda2 VG vg_srv lvm2 [118.75 GiB / 0 free] Total: 1 [118.75 GiB] / in use: 1 [118.75 GiB] / in no VG: 0 [0 ] [root@srv ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda2 vg_srv lvm2 a--u 118.75g 0 [root@srv ~]# pvdisplay -m --- Physical volume --- PV Name /dev/sda2 VG Name vg_srv PV Size 118.75 GiB / not usable 3.00 MiB Allocatable yes (but full) PE Size 4.00 MiB Total PE 30400 Free PE 0 Allocated PE 30400 PV UUID zgJiHY-dPQM-Z3vH-nkeG-ZpyZ-s7xA-9iTUO1 --- Physical Segments --- Physical extent 0 to 12799: Logical volume /dev/vg_srv/lv_root Logical extents 0 to 12799 Physical extent 12800 to 27347: Logical volume /dev/vg_srv/lv_home Logical extents 0 to 14547 Physical extent 27348 to 30399: Logical volume /dev/vg_srv/lv_swap Logical extents 0 to 3051 [root@srv ~]# vgs -o +devices,lv_path VG #PV #LV #SN Attr VSize VFree Devices Path vg_srv 1 3 0 wz--n- 118.75g 0 /dev/sda2(0) /dev/vg_srv/lv_root vg_srv 1 3 0 wz--n- 118.75g 0 /dev/sda2(12800) /dev/vg_srv/lv_home vg_srv 1 3 0 wz--n- 118.75g 0 /dev/sda2(27348) /dev/vg_srv/lv_swap [root@srv ~]# vgdisplay -v Using volume group(s) on command line. --- Volume group --- VG Name vg_srv System ID Format lvm2 Metadata Areas 1 Metadata Sequence No 4 VG Access read/write VG Status resizable MAX LV 0 Cur LV 3 Open LV 3 Max PV 0 Cur PV 1 Act PV 1 VG Size 118.75 GiB PE Size 4.00 MiB Total PE 30400 Alloc PE / Size 30400 / 118.75 GiB Free PE / Size 0 / 0 VG UUID SpJeha-xf3S-DrYW-CJOg-Ya5J-AURI-pWfZlB --- Logical volume --- LV Path /dev/vg_srv/lv_root LV Name lv_root VG Name vg_srv LV UUID atdKQC-00DU-PY4i-6DQR-CO3O-TqZ1-9gxZTo LV Write Access read/write LV Creation host, time srv, 2018-11-08 16:37:25 +0000 LV Status available # open 1 LV Size 50.00 GiB Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Path /dev/vg_srv/lv_home LV Name lv_home VG Name vg_srv LV UUID xSaD5k-yWIO-E31y-LMBp-MG16-xpHG-ZCMWfM LV Write Access read/write LV Creation host, time srv, 2018-11-08 16:37:33 +0000 LV Status available # open 1 LV Size 56.83 GiB Current LE 14548 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 --- Logical volume --- LV Path /dev/vg_srv/lv_swap LV Name lv_swap VG Name vg_srv LV UUID MjO8jh-ZcZU-iTns-MS70-1vhS-Gvpf-EAhFA7 LV Write Access read/write LV Creation host, time srv, 2018-11-08 16:37:42 +0000 LV Status available # open 1 LV Size 11.92 GiB Current LE 3052 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 --- Physical volumes --- PV Name /dev/sda2 PV UUID zgJiHY-dPQM-Z3vH-nkeG-ZpyZ-s7xA-9iTUO1 PV Status allocatable Total PE / Free PE 30400 / 0 [root@srv ~]# lvs --segments LV VG Attr #Str Type SSize lv_home vg_srv -wi-ao---- 1 linear 56.83g lv_root vg_srv -wi-ao---- 1 linear 50.00g lv_swap vg_srv -wi-ao---- 1 linear 11.92g [root@srv ~]# lvdisplay -m --- Logical volume --- LV Path /dev/vg_srv/lv_root LV Name lv_root VG Name vg_srv LV UUID atdKQC-00DU-PY4i-6DQR-CO3O-TqZ1-9gxZTo LV Write Access read/write LV Creation host, time srv, 2018-11-08 16:37:25 +0000 LV Status available # open 1 LV Size 50.00 GiB Current LE 12800 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Segments --- Logical extents 0 to 12799: Type linear Physical volume /dev/sda2 Physical extents 0 to 12799 --- Logical volume --- LV Path /dev/vg_srv/lv_home LV Name lv_home VG Name vg_srv LV UUID xSaD5k-yWIO-E31y-LMBp-MG16-xpHG-ZCMWfM LV Write Access read/write LV Creation host, time srv, 2018-11-08 16:37:33 +0000 LV Status available # open 1 LV Size 56.83 GiB Current LE 14548 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 --- Segments --- Logical extents 0 to 14547: Type linear Physical volume /dev/sda2 Physical extents 12800 to 27347 --- Logical volume --- LV Path /dev/vg_srv/lv_swap LV Name lv_swap VG Name vg_srv LV UUID MjO8jh-ZcZU-iTns-MS70-1vhS-Gvpf-EAhFA7 LV Write Access read/write LV Creation host, time srv, 2018-11-08 16:37:42 +0000 LV Status available # open 1 LV Size 11.92 GiB Current LE 3052 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 --- Segments --- Logical extents 0 to 3051: Type linear Physical volume /dev/sda2 Physical extents 27348 to 30399
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