23，lvm 快照
阿新 • • 發佈：2020-12-08
1，lvm 快照 [root@centos7 ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root centos -wi-ao---- 9.30g swap centos -wi-ao---- 512.00m lv1 vg1_demo -wi-a----- 40.00m [root@centos7 ~]# [root@centos7 ~]# vgs VG #PV #LV #SN Attr VSize VFree centos 1 2 0 wz--n- 9.80g 0 vg1_demo 3 1 0 wz--n- 2.50g 2.46g [root@centos7 ~]# [root@centos7 ~]# pvs PV VG Fmt Attr PSize PFree /dev/sda2 centos lvm2 a-- 9.80g 0 /dev/sdb6 vg1_demo lvm2 a-- 48.00m 48.00m /dev/sdb7 vg1_demo lvm2 a-- 48.00m 48.00m /dev/sdb8 vg1_demo lvm2 a-- <2.41g <2.37g [root@centos7 ~]# [root@centos7 ~]# lvcreate -n lvs_snap -L 45M -s /dev/vg1_demo/lv1 Using default stripesize 64.00 KiB. Rounding up size to full physical extent 48.00 MiB Reducing COW size 48.00 MiB down to maximum usable size 44.00 MiB. Logical volume "lvs_snap" created. [root@centos7 ~]# [root@centos7 ~]# lvs LV VG Attr LSize Pool Origin Data% Meta% Move Log Cpy%Sync Convert root centos -wi-ao---- 9.30g swap centos -wi-ao---- 512.00m lv1 vg1_demo owi-a-s--- 40.00m lvs_snap vg1_demo swi-a-s--- 44.00m lv1 0.00 [root@centos7 ~]# 2，快照可以直接掛載。和原始的檔案對比，比對區別