From: Christoph Hellwig <hch@infradead.org>
To: Sage Weil <sage@inktank.com>
Cc: Christoph Hellwig <hch@infradead.org>,
Dominik Mostowiec <dominikmostowiec@gmail.com>,
ceph-devel <ceph-devel@vger.kernel.org>,
"ceph-users@lists.ceph.com" <ceph-users@lists.ceph.com>
Subject: Re: os recommendations
Date: Wed, 27 Nov 2013 00:14:26 -0800 [thread overview]
Message-ID: <20131127081426.GA12165@infradead.org> (raw)
In-Reply-To: <alpine.DEB.2.00.1311260647310.24677@cobra.newdream.net>
On Tue, Nov 26, 2013 at 06:50:33AM -0800, Sage Weil wrote:
> If syncfs(2) is not present, we have to use sync(2). That means you have
> N daemons calling sync(2) to force a commit on a single fs, but all other
> mounted fs's are also synced... which means N times the sync(2) calls.
>
> Fortunately syncfs(2) has been around for a while now, so this only
> affects really old distros. And even when glibc does not have a syscall
> wrapper for it, we try to call the syscall directly.
And for btrfs you were/are using magic ioctls, right.
Looks like the page reference in the last post has already been updated,
thanks!
prev parent reply other threads:[~2013-11-27 8:14 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-11-26 10:43 os recommendations Dominik Mostowiec
2013-11-26 14:22 ` Christoph Hellwig
[not found] ` <20131126142243.GA7360-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2013-11-26 14:50 ` Sage Weil
2013-11-26 21:27 ` Dominik Mostowiec
2013-11-27 8:14 ` Christoph Hellwig [this message]
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