From: Christoph Hellwig <hch@infradead.org>
To: Mark Nelson <mark.nelson@inktank.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Tommi Virtanen <tv@inktank.com>,
ceph-devel@vger.kernel.org
Subject: Re: TIER: combine SSDs and HDDs into a single block device
Date: Fri, 3 Aug 2012 03:22:17 -0400 [thread overview]
Message-ID: <20120803072217.GA23837@infradead.org> (raw)
In-Reply-To: <501AF5D7.9060004@inktank.com>
On Thu, Aug 02, 2012 at 04:49:11PM -0500, Mark Nelson wrote:
> I was thinking of doing that. Is the realtime allocator a good fit
> for this kind of thing? I think dchinner mentioned on the xfs
> mailing list last year that it's single threaded and not very well
> optimized (and maybe not production viable?)
It's generally a bit dated and bit rotting, and as Dave said doesn't
parallelize. But for a setup where you have one OSD per disk and lots
of OSD that's not really quite as important.
next prev parent reply other threads:[~2012-08-03 7:22 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-08-02 16:13 TIER: combine SSDs and HDDs into a single block device Tommi Virtanen
2012-08-02 17:02 ` Mark Nelson
2012-08-02 17:19 ` Alex Elder
2012-08-02 17:57 ` Christoph Hellwig
2012-08-02 21:49 ` Mark Nelson
2012-08-03 7:22 ` Christoph Hellwig [this message]
2012-08-02 17:32 ` Calvin Morrow
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