LVM3
快照损坏测试
# cp /etc/*.conf /mnt/
# ls /mnt/
asound.conf latrace.conf pm-utils-hd-apm-restore.conf
autofs_ldap_auth.conf ld.so.conf prelink.conf
cas.conf libaudit.conf readahead.conf
cgconfig.conf libuser.conf report.conf
cgrules.conf logrotate.conf request-key.conf
dnsmasq.conf lost+found resolv.conf
dracut.conf ltrace.conf rsyslog.conf
elinks.conf mdadm.conf sestatus.conf
fprintd.conf mke2fs.conf smartd.conf
gai.conf nfsmount.conf sos.conf
grub.conf nscd.conf sysctl.conf
gssapi_mech.conf nslcd.conf updatedb.conf
host.conf nsswitch.conf warnquota.conf
idmapd.conf ntp.conf webalizer.conf
ipsec.conf oddjobd.conf wvdial.conf
kdump.conf pam_ldap.conf yp.conf
krb5.conf pear.conf yum.conf
# lvcreate -L 100M -n snap_lv01 -s /dev/vg01/lv01
Logical volume "snap_lv01" created
# lvdisplay /dev/vg01/snap_lv01
--- Logical volume ---
LV Name /dev/vg01/snap_lv01
VG Name vg01
LV UUID 1sJBN0-7yTB-VrQ5-mO2j-gLDL-N91j-BwIOwr
LV Write Access read/write
LV snapmntstatus active destination for /dev/vg01/lv01 //此处指明是lv01的快照
LV Status available
# open 0
LV Size 1.95 GiB
Current LE 500
COW-table size 100.00 MiB
COW-table LE 25
Allocated to snapmnt 0.01%
Snapmntchunk size 4.00 KiB
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
挂载到
# mount /dev/vg01/lv01 /media/
# ls /media/
asound.conf latrace.conf pm-utils-hd-apm-restore.conf
autofs_ldap_auth.conf ld.so.conf prelink.conf
cas.conf libaudit.conf readahead.conf
cgconfig.conf libuser.conf report.conf
cgrules.conf logrotate.conf request-key.conf
dnsmasq.conf lost+found resolv.conf
dracut.conf ltrace.conf rsyslog.conf
elinks.conf mdadm.conf sestatus.conf
fprintd.conf mke2fs.conf smartd.conf
gai.conf nfsmount.conf sos.conf
grub.conf nscd.conf sysctl.conf
gssapi_mech.conf nslcd.conf updatedb.conf
host.conf nsswitch.conf warnquota.conf
idmapd.conf ntp.conf webalizer.conf
ipsec.conf oddjobd.conf wvdial.conf
kdump.conf pam_ldap.conf yp.conf
krb5.conf pear.conf yum.conf
内容和原来的LVM的内容一样，创建的LVM只有100M如果内容超过100M的话就会是快照损坏，卸载快照后快照就不能使用了。下面就用dd写入一个120M的文件，看看
# dd if=/dev/zero of=/mnt/dd.test bs=1M count=120
记录了120+0 的读入
记录了120+0 的写出
125829120字节(126 MB)已复制，9.42529 秒，13.4 MB/秒
# lvdisplay
--- Logical volume ---
LV Name /dev/vg01/lv01
VG Name vg01
LV UUID XVwDf2-HDDR-rEox-AK77-dcLQ-73JS-5AOBZR
LV Write Access read/write
LV snapmntstatus source of
/dev/vg01/snap_lv01 [INACTIVE] //不能使用了
LV Status available
# open 1
LV Size 1.95 GiB
Current LE 500
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:2
--- Logical volume ---
LV Name /dev/vg01/snap_lv01
VG Name vg01
LV UUID 1sJBN0-7yTB-VrQ5-mO2j-gLDL-N91j-BwIOwr
LV Write Access read/write
LV snapmntstatus INACTIVE destination for /dev/vg01/lv01
LV Status available
# open 0
LV Size 1.95 GiB
Current LE 500
COW-table size 100.00 MiB
COW-table LE 25
Snapmntchunk size 4.00 KiB
Segments 1
Allocation inherit
Read ahead sectors auto
- currently set to 256
Block device 253:3
# umount /media/ //卸载快照
# mount /dev/vg01/snap_lv01 /media/ //在挂载
mount: you must specify the filesystem type // 已经不能使用
本文出自 “小黑” 博客，谢绝转载！