re-scan new disks without restarting CentOS
- re-scan new disks(/dev/sdc):
#ls /sys/class/scsi_host/
host0 host1 host2
[root@db210_13:56:14 /data]
#echo "- - -" > /sys/class/scsi_host/host0/scan
[root@db210_13:57:57 /data]
#echo "- - -" > /sys/class/scsi_host/host1/scan
[root@db210_13:57:57 /data]
#echo "- - -" > /sys/class/scsi_host/host2/scan
[root@db210_13:57:58 /data]
#fdisk -l
Disk /dev/sda: 64.4 GB, 64424509440 bytes, 125829120 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: 0x00084df7
Device Boot Start End Blocks Id System
/dev/sda1 * 2048 1026047 512000 83 Linux
/dev/sda2 1026048 5222399 2098176 82 Linux swap / Solaris
/dev/sda3 5222400 86259711 40518656 83 Linux
/dev/sda4 86259712 125829119 19784704 5 Extended
/dev/sda5 86261760 125829119 19783680 83 Linux
Disk /dev/sdb: 214.7 GB, 214748364800 bytes, 419430400 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: 0x0e9c0acb
Device Boot Start End Blocks Id System
/dev/sdb1 2048 419430399 209714176 83 Linux
**Disk /dev/sdc: 536.9 GB**, 536870912000 bytes, 1048576000 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
[root@db210_12:15:04 /backup]
#fdisk /dev/sdc
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.
Device does not contain a recognized partition table
Building a new DOS disklabel with disk identifier 0xb4f30c82.
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):
First sector (2048-1048575999, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-1048575999, default 1048575999):
Using default value 1048575999
Partition 1 of type Linux and of size 500 GiB is set
Command (m for help): w
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.
[root@db210_12:15:23 /backup]
#pvcreate /dev/sdc1
Physical volume "/dev/sdc1" successfully created.
[root@db210_12:15:47 /backup]
#pvs
PV VG Fmt Attr PSize PFree
/dev/sdc1 lvm2 --- <500.00g <500.00g
#vgcreate MySQL /dev/sdc1
Volume group "MySQL" successfully created
#vgs
VG #PV #LV #SN Attr VSize VFree
MySQL 1 0 0 wz--n- <500.00g <500.00g
#lvcreate -L499G MySQL
Logical volume "lvol0" created.
- Format LV and Mount the LV
[root@db210_12:21:52 /backup]
#mkfs.xfs /dev/MySQL/lvol0
meta-data=/dev/MySQL/lvol0 isize=256 agcount=4, agsize=32702464 blks
= sectsz=512 attr=2, projid32bit=1
= crc=0 finobt=0
data = bsize=4096 blocks=130809856, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0 ftype=0
log =internal log bsize=4096 blocks=63872, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
#mkdir /data2
[root@db210_12:24:39 /backup]
#mount /dev/MySQL/lvol0 /data2
[root@db210_12:25:18 /data]
#mv * /data2/
#df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda3 39G 12G 28G 30% /
devtmpfs 3.9G 0 3.9G 0% /dev
tmpfs 3.9G 0 3.9G 0% /dev/shm
tmpfs 3.9G 8.6M 3.9G 1% /run
tmpfs 3.9G 0 3.9G 0% /sys/fs/cgroup
/dev/sda5 19G 33M 19G 1% /home
/dev/sdb1 200G 33M 200G 1% /data
/dev/sda1 497M 119M 379M 24% /boot
tmpfs 783M 0 783M 0% /run/user/0
/dev/mapper/MySQL-lvol0 499G 44G 456G 9% /data2