Linux lossless expansion method
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Overview The cloud platform customer's server may run out of disk space as the business volume continues to grow. For example, if the shared file server's hard disk space is insufficient, you need to increase the disk space to meet the online business needs. Or when we use Linux, sometimes some partitions may have insufficient space due to improper partitioning during system installation, while others may have excess space. You can use the fdisk partition tool to dynamically adjust the partition size. step 1. Backup Even if it is lossless expansion, accidents are inevitable, so backup is essential. Generally, cloud platforms have backup functions that can directly make a full backup of the disk. 2. Repartition with fdisk The default partitions are as follows root@i-abnawjwo:/# df Filesystem 1K-blocks Used Available Use% Mounted on udev 497752 4 497748 1% /dev tmpfs 101700 440 101260 1% /run /dev/sda1 20509308 1337636 18106816 7% / none 4 0 4 0% /sys/fs/cgroup none 5120 0 5120 0% /run/lock none 508488 0 508488 0% /run/shm none 102400 0 102400 0% /run/user /dev/sdc1 10190136 23032 9626432 1% /data root@i-abnawjwo:/data# cat hello test1 Unmount the current partition If you cannot uninstall it, there may be a process using it. You can use fuser or lsof to check fuser -m -v /data fuser -m -v -i -k /data lsof /data After uninstalling, use fdisk to delete the original partition and repartition it. Note that the starting cylinder number must be consistent with the original one (this is a key step to ensure that data is not lost)
root@i-abnawjwo:/# umount /data
root@i-abnawjwo:/# fdisk /dev/sdc
Command (m for help): d
Selected partition 1
Command (m for help): n
Partition type:
p primary (0 primary, 0 extended, 4 free)
e extended
Select (default p):
Using default response p
Partition number (1-4, default 1):
Using default value 1
First sector (2048-104857599, default 2048):
Using default value 2048
Last sector, +sectors or +size{K,M,G} (2048-104857599, default 104857599):
Using default value 104857599
Command (m for help): p
Disk /dev/sdc: 53.7 GB, 53687091200 bytes
64 heads, 32 sectors/track, 51200 cylinders, total 104857600 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: 0x305cddae
Device Boot Start End Blocks Id System
/dev/sdc1 2048 104857599 52427776 83 Linux
Command (m for help): wq
The partition table has been altered!
Calling ioctl() to re-read partition table.
Syncing disks.Restart the system 3. Detect partitions and expand partition size root@i-abnawjwo:~# e2fsck -f /dev/sdb1 e2fsck 1.42.9 (4-Feb-2014) Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure Pass 3: Checking directory connectivity Pass 4: Checking reference counts Pass 5: Checking group summary information /dev/sdb1: 12/655360 files (0.0% non-contiguous), 79664/2621440 blocks root@i-abnawjwo:~# resize2fs -p /dev/sdb1 resize2fs 1.42.9 (4-Feb-2014) Resizing the filesystem on /dev/sdb1 to 13106944 (4k) blocks. The filesystem on /dev/sdb1 is now 13106944 blocks long. 4. Remount, check partition size, and check data root@i-abnawjwo:~# mount /dev/sdb1 /data/ root@i-abnawjwo:/data# cat hello acasdcacsa root@i-abnawjwo:/data# df Filesystem 1K-blocks Used Available Use% Mounted on udev 497752 4 497748 1% /dev tmpfs 101700 428 101272 1% /run /dev/sda1 20509308 1337768 18106684 7% / none 4 0 4 0% /sys/fs/cgroup none 5120 0 5120 0% /run/lock none 508488 0 508488 0% /run/shm none 102400 0 102400 0% /run/user /dev/sdb1 51474044 33100 48803172 1% /data The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM. You may also be interested in:
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