On 11.09.2012 15:50, Lee Stewart wrote:
Hi all... A related batch of questions....
Is anyone out there using an IBM V7000 for their Linux?
And anyone using any thin provisioning? I saw the thread about XIV
a
couple months back. Does anyone know of a good writeup for what's
what
from a Linux filesystem point of view? Or setup tips?
We use RHEV thin provisioning on our Intel RHEV environments, and we'll
be using it on our 3PARs when they're up and running. The main lesson
I'd take away from the RHEV experiance is that it's like any other use
of overcommit: you need to be aware of how your actuals are tracking
your overcommit, or you can suddenly run out of real resources. Other
than that, it's great. We've not observed any meaningful performance
hits from overommitting, but then we're not doing it on DB servers (for
example), and the V7000 implementation may be better or worse on that
front.
That thread mentions btrfs, but this client wants to use RH, and from
what I read on RH's site, they consider btrfs "experimental". Anyone
using btrfs on RH?
I used butter on Fedora and Debian this year. I was underwhelmed and
would not trust my data to it, but then I'm conservative about new
filesystems. I held of ext4 when some distros were touting it as
production-ready. Which meant when one of them was shipping a bugger
version that ate filesystems, my ext3 FSes were happy.
Specifically I'm underwhemled by the maturity of the management tools
and the ability to recover data; Chris Mason, the principal dev, doesn't
seem to be touting it as ready for deployment on production servers,
either, and I'd be more interested in his opinion that in that of
distros trying to one-up one another by claiming it's production ready.
(I'm also underwhelmed by having used ZFS for years; btr has many of
the same benefits, but also many of the same disadvantages.)
You should probably talk to the client about the use cases where they
see themselves as getting something out of btrfs that they won't get out
of ext4+LVM or XFS+LVM.
(I'd also recommend, if you have a spare chunk of time, Dave Chinner's
overview of the state of XFS vs EXT4 & btrfs, at
http://www.youtube.com/watch?v=FegjLbCnoBw&feature=plcp and Avi Miller's
overview of the state of BTRFS at the start of the year, at
http://www.youtube.com/watch?v=hxWuaozpe2I&feature=plcp).
--
Rodger Donaldson
rodg...@diaspora.gen.nz
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