From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <002001c31d4d$eebf5630$6c7745cb@codevel> From: "armani" References: <001501c31d2a$0ea25f20$6c7745cb@codevel> <3EC788E9.9020701@adelphia.net> Subject: Re: [linux-lvm] Newbie to snapshot MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-lvm-admin@sistina.com Errors-To: linux-lvm-admin@sistina.com Reply-To: linux-lvm@sistina.com List-Help: List-Post: List-Subscribe: , List-Unsubscribe: , List-Archive: Date: Sun May 18 09:58:01 2003 List-Id: Content-Type: text/plain; charset="us-ascii" To: linux-lvm@sistina.com Thanks for toby's explainations! == Eventually I create a new snapshot of my LV partition. But I have another problem with the snapshot of LV. That is how much snapshot I could create for my LV partition ? As I know some commercial software could create 254 snapshots for one LV such as IBM. So I try to create another snapshot for LV by issuing the following command: This is my first snapshot for /dev/Vol1/LV1 [root@met root]# lvcreate --size 100M -s -nsnapshot /dev/Vol1/LV1 lvcreate -- WARNING: the snapshot will be automatically disabled once it gets full lvcreate -- INFO: using default snapshot chunk size of 64 KB for "/dev/Vol1/snapshot" lvcreate -- doing automatic backup of "Vol1" lvcreate -- logical volume "/dev/Vol1/snapshot" successfully created I tried to create another snapshot for /dev/Vol1/LV1 [root@met root]# lvcreate --size 100M -s -nsnapshot1 /dev/Vol1/LV1 lvcreate -- WARNING: the snapshot will be automatically disabled once it gets full lvcreate -- INFO: using default snapshot chunk size of 64 KB for "/dev/Vol1/snapshot1" lvcreate -- doing automatic backup of "Vol1" lvcreate -- logical volume "/dev/Vol1/snapshot1" successfully created And how can I estimate the sizes and counts for them ? Is there any rules or principles to formalize the procedures ? > A snapshot will only capture what you have in the fs at the moment you -- snip -- > -toby -- Armani Liao