does snapshot work in as4??

cxfcxf

i make a vg named test and a lv named data
path is /dev/test/data
i mount /dev/test/data to /data with read only mode
then i want to make a snapshot for /data

typed command
lvcreate -s -L 10m -n snap /dev/test/data

ok...nothing happen
it 's showed a help file to tell me my command is wrong...
but i can't find the mistake

kissingwolf

我没试过快照，还是看看man吧！

cxfcxf

[root@client ~]# lvcreate --size 100m --snapshot --name snap /dev/sda/data
  snapshot: Required device-mapper target(s) not detected in your kernel
  lvcreate: Create a logical volume
谢谢kevin老师。。找到原因了 kernel不支持device-mapper  模块也没
需要自己编译进去~~

ecloud

Post by cxfcxf
i make a vg named test and a lv named data
path is /dev/test/data
i mount /dev/test/data to /data with read only mode
then i want to make a snapshot for /data

typed command
lvcreate -s -L 10m -n snap /dev/test/data

ok...nothing happen
it 's showed a help file to tell me my command is wrong...
but i can't find the mistake

默认内核不支持snapshot

1. 
   
2. lvm> lvcreate -s
   
3.   snapshot: Required device-mapper target(s) not detected in your kernel
   

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需要手工装载模块：

1. 
   
2. [root@tserver ~]# ls /lib/modules/2.6.9-22.EL/kernel/drivers/md/dm-snapshot.ko
   
3. /lib/modules/2.6.9-22.EL/kernel/drivers/md/dm-snapshot.ko
   
4. [root@tserver ~]# modprobe -v dm-snapshot
   
5. insmod /lib/modules/2.6.9-22.EL/kernel/drivers/md/dm-snapshot.ko
   
6. [root@tserver ~]# lvm
   
7. lvm> lvcreate -s
   
8.   Please specify a logical volume to act as the snapshot origin.
   

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cxfcxf

谢谢楼上 我对内核模块的名字不熟悉。。所以没找到modprobe的对象~_~
modprobe -l|grep snapshot ..