ext3 ->ext4 전환 마이그레이션 수행

Linux OS 를 운영하다보면, 파일시스템의 성능 이슈등으로 ext3 -> ext4 로 전환이 필요할 경우가 있다.

 

통상적으로는 파일시스템 전환시 신규 파일시스템 할당 및 작성후 데이터 마이그레이션을 수반하게 되나,

 

ext3 -> ext4 전환시는 아래와 같이 간단한 과정을 통해 마이그레이션이 가능하다.

 

[root@s-node01 /]# yum -y install e4fsprogs* [root@s-node01 /]# [root@s-node01 /]# mount -l | grep data1 /dev/sdc1 on /data1 type ext3 (rw) [root@s-node01 /]# [root@s-node01 /]# du -sh /data1 44K /data1 [root@s-node01 /]# [root@s-node01 /]# find /data1 -type f /data1/origin/sample.dat.md5 /data1/origin/sample.dat /data1/copy/sample.dat.md5 /data1/copy/sample.dat [root@s-node01 /]# [root@s-node01 /]# [root@s-node01 /]# [root@s-node01 /]# df -h | grep data1 /dev/sdc1              40G  177M   38G   1% /data1 [root@s-node01 /]# [root@s-node01 /]# [root@s-node01 /]# [root@s-node01 /]# umount /data1 [root@s-node01 /]# [root@s-node01 /]# tune4fs -O extents,uninit_bg,dir_index /dev/sdc1 tune4fs 1.41.12 (17-May-2010) Please run e4fsck on the filesystem. [root@s-node01 /]# e4fsck -fyDC0 /dev/sdc1 e4fsck 1.41.12 (17-May-2010) One or more block group descriptor checksums are invalid.  Fix? yes Group descriptor 0 checksum is invalid.  FIXED. Group descriptor 1 checksum is invalid.  FIXED. ... 중략 Group descriptor 318 checksum is invalid.  FIXED. Group descriptor 319 checksum is invalid.  FIXED. Adding dirhash hint to filesystem. Pass 1: Checking inodes, blocks, and sizes Pass 2: Checking directory structure                                           Pass 3: Checking directory connectivity Pass 3A: Optimizing directories Pass 4: Checking reference counts                                              Pass 5: Checking group summary information                                                                                /dev/sdc1: ***** FILE SYSTEM WAS MODIFIED ***** /dev/sdc1: 17/5242880 files (0.0% non-contiguous), 209594/10484412 blocks [root@s-node01 /]# [root@s-node01 /]# [root@s-node01 /]# [root@s-node01 /]# mount -t ext4 /dev/sdc1 /data1 [root@s-node01 /]# [root@s-node01 /]# blkid /dev/sdc1 /dev/sdc1: UUID="6fd07d84-7785-43cc-9ba5-0b35a1660876" TYPE="ext4" [root@s-node01 /]# [root@s-node01 /]# find /data1 -type f /data1/origin/sample.dat.md5 /data1/origin/sample.dat /data1/copy/sample.dat.md5 /data1/copy/sample.dat [root@s-node01 /]# [root@s-node01 /]# [root@s-node01 /]# du -sh /data1 44K /data1 [root@s-node01 /]# [root@s-node01 /]#