[linux-lvm] LVM multiple Snpshots implementation query

[Busby.Cheung]

Did you mean you want to use something like shared-snapshot? COW once?
I know shared-snapshot implemented by Mikulas and others:
http://people.redhat.com/mpatocka/patches/kernel/new-snapshots/r19/
 


 

在2010-05-10，"andiket a" <truly_linux at yahoo.co.in> 写道： -----原始邮件-----
发件人:"andiket a" <truly_linux at yahoo.co.in>
发送时间:2010年5月10日 星期一
收件人:linux-lvm at redhat.com
主题:[linux-lvm] LVM multiple Snpshots implementation query


Hi,

If there are multiple snapshots then write to origin is an expensive operation.
My understanding after looking at the code of orig_wirte() is that if a write comes on a chunk on orig device then cow is initiated for all the snapshots.
This is an expensive operation for sure.

Does anyone know if there was any reason behind implementing it like this?

Thanks,
Andiket.


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