Re: [Xen-users] IO is a big difference between the "file" and "phy"

["Fajar A. Nugraha" <list@xxxxxxxxx>]

On Tue, Jun 19, 2012 at 5:18 PM, Fajar A. Nugraha <list@xxxxxxxxx> wrote:
> On Tue, Jun 19, 2012 at 5:08 PM, Ian Campbell <Ian.Campbell@xxxxxxxxxx> wrote:
>> On Thu, 2012-06-14 at 23:51 +0100, Florian Heigl wrote:
>>> A more modern option is the LVMTHIN target for device mapper, but that
>>> requires some good LVM knowledge.
>>
>> This sound like it might be an interesting project, do you have link?
>> Google just came up with a bunch of linux-lvm threads..
>
> Probably http://lwn.net/Articles/465740/
>
> However looking at the (frighteningly) high amount of dmsetup, and
> somewhat sparse documentation (what does 20971520 refer to?),
> personally I prefer to use zfsonlinux's zvol (which can create thin
> volumes as well) for now.

FWIW, RHEL 6.3 apparently has incorporate thin snapshots to their lvm2
package as a tech preview:
https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.3_Technical_Notes/storage_and_fs_tp.html

-- 
Fajar

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