Re: [vserver] btrfs/hashify/cow....

From: John A. Sullivan III <jsullivan_at_opensourcedevel.com>
Date: Sat 08 Sep 2012 - 21:38:46 BST
Message-ID: <1347136727.26009.3.camel@denise.theartistscloset.com>

On Sat, 2012-09-08 at 17:16 +0100, Gordan Bobic wrote:
> On 09/08/2012 11:10 AM, Tor Rune Skoglund wrote:
> > 2012/9/7 Gordan Bobic<gordan@bobich.net>:
> >> On 09/07/2012 04:11 PM, Tor Rune Skoglund wrote:
> <snip>>>
> >>> - Presumably, all hashifed files must reside on the same partition?
> >>
> >> Indeed, they must all be on the same file system.
> >
> > Additional ?: The host run on a partition of it own. The guests on
> > another partition. So then the host is left out of the hashify
> > process, but the guests still can be hashified towards "eachother" ?
>
> All that is required is that your /vservers/ directory is on a single
> file system. The host file system is unrelated. Only the guests get
> mutually hashified, not the host.
Does this mean your earlier comment about disabling prelink does not
apply to the host, i.e., we must disable it in the guests but can keep
it in the host?
> <snip>

> I never tried it, so I cannot comment either way. After the BTRFS devs
> didn't manage to understand why CoW hard-links would be useful as a FS
> feature (without vserver), and after some of the comments they made
> regarding deduplication features and how (and whether) they plan to
> implement it in BTRFS, I made a firm decision I'm not going to touch it
> with a barge-pole. Ever. If these are the people designing and
> developing the FS, I'm not prepared to entrust my data to it. Where my
> requirements are feature-rich, I have switched to ZFS (ZFS-on-Linux
> kernel driver, not the fuse implementation) and never looked back. I
> still think it was the right decision.
>
<snip>
We've been using ZFS on OpenSolaris as I've heard the BSD implementation
is poor and the FUSE implementation does not perform as well. I was not
aware there was a ZFS-on-Linux kernel driver. I was under the
assumption the licenses were incompatible and hence FUSE was the only
Linux option.

Is this real ZFS on Linux? Does it compare in features and performance
to OpenSolaris? If so, I think it would be even better than OpenSolaris
as it appears the network stack latency is lower in Linux than
OpenSolaris from what we've seen. Thanks - John
Received on Sat Sep 8 21:39:01 2012

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