From: Joost Roeleveld <joost@antarean.org>
To: gentoo-user@lists.gentoo.org
Subject: Re: [gentoo-user] terrible performance with btrfs on LVM2 using a WD 2TB green drive
Date: Wed, 16 Mar 2011 12:41:46 +0100 [thread overview]
Message-ID: <20110316114207.3E120304B@data.antarean.org> (raw)
In-Reply-To: <4D807A91.2000901@binarywings.net>
On Wednesday 16 March 2011 09:53:37 Florian Philipp wrote:
> Am 15.03.2011 07:50, schrieb Matthew Marlowe:
> >> My problem is that LVM2 is not supported in parted which is the
> >> recommended tool to deal with this.
> >>
> >> I suspect I only need to map the individual PE to a particular start
> >> sector on each drive, not btrfs, but then there is stripe/block sizes
> >> to
> >> consider as well ... WD also are recommending 1mb sector boundaries
> >> for
> >> best performance - I can see a reinstall coming up :)
> >
> > I have on my workstation:
> > 2 WD 2TB Black Drives
> > 5 WD 2TB RE4 Drives
> >
> > Some notes:
> > - The black drives have horrible reliability, poor sector remapping, and
> > have certain standard drive features to make them unusable in raid. I
> > would not buy them again. I'm not sure how similar the green drives
> > are.
>
> Green drives also seem to be affected:
> http://doug.warner.fm/d/blog/2009/11/Western-Digital-15TB-Green-Drives-Not-y
> our-Linux-Software-RAID
I have 6 Green drives (WDC WD15EARS) in a RAID5 and I have not seen any
issues.
Only issue I saw was 1 drive with "reallocated" sectors as also mentioned by
one of the commenters on that page.
Replaced that drive and no further problems so far.
I did, however, spent time to align the sectors correctly for the Raid-
partitions, striping, LVM blocksize and the mkfs-statements.
Without those, performance was really bad.
I would prefer to see proper support for 4K-sector-size drives.
--
Joost
next prev parent reply other threads:[~2011-03-16 11:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-03-15 5:37 [gentoo-user] terrible performance with btrfs on LVM2 using a WD 2TB green drive Bill Kenworthy
2011-03-15 6:50 ` Matthew Marlowe
2011-03-15 10:22 ` William Kenworthy
2011-03-16 8:53 ` Florian Philipp
2011-03-16 11:41 ` Joost Roeleveld [this message]
2011-03-15 15:26 ` [gentoo-user] " James
2011-03-15 15:44 ` Volker Armin Hemmann
2011-03-16 0:29 ` Bill Kenworthy
2011-03-16 15:57 ` james
2011-03-23 1:57 ` Bill Kenworthy
2011-03-16 10:33 ` Helmut Jarausch
2011-03-15 15:45 ` [gentoo-user] " Volker Armin Hemmann
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