From: Stefan Priebe <s.priebe@profihost.ag>
To: Mark Nelson <mark.nelson@inktank.com>
Cc: ceph-devel@vger.kernel.org
Subject: Re: how to debug slow rbd block device
Date: Tue, 22 May 2012 22:54:12 +0200 [thread overview]
Message-ID: <4FBBFCF4.5060905@profihost.ag> (raw)
In-Reply-To: <4FBBFBA5.9090604@inktank.com>
Am 22.05.2012 22:48, schrieb Mark Nelson:
> Can you use something like iostat or collectl to check and see if the
> write throughput to each SSD is roughly equal during your tests?
It is but just around 20-40MB/s. But they can write 260MB/s with
sequential writes.
> Also, what FS are you using and how did you format/mount it?
just:
mkfs.xfs /dev/sdb1
mount options: noatime,nodiratime,nobarrier,discard
Stefan
next prev parent reply other threads:[~2012-05-22 20:54 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-22 12:45 how to debug slow rbd block device Stefan Priebe - Profihost AG
2012-05-22 14:52 ` Andrey Korolyov
2012-05-22 19:27 ` Stefan Priebe
2012-05-22 19:35 ` Greg Farnum
2012-05-22 19:40 ` Stefan Priebe
2012-05-22 19:52 ` Greg Farnum
2012-05-22 20:13 ` Stefan Priebe
2012-05-22 20:30 ` Stefan Priebe
2012-05-22 20:48 ` Mark Nelson
2012-05-22 20:54 ` Stefan Priebe [this message]
2012-05-22 20:49 ` Greg Farnum
2012-05-22 21:00 ` Stefan Priebe
2012-05-22 21:11 ` Greg Farnum
2012-05-23 6:18 ` Stefan Priebe - Profihost AG
2012-05-23 6:30 ` Josh Durgin
2012-05-23 7:01 ` Stefan Priebe - Profihost AG
2012-05-23 7:19 ` Josh Durgin
2012-05-23 7:22 ` Stefan Priebe - Profihost AG
2012-05-23 7:33 ` Josh Durgin
[not found] ` <CABYiri8PXT9dpCGLE7dn=_PoW8CdLxqZF87OHe=dMXEWxogb_w@mail.gmail.com>
2012-05-23 19:54 ` Josh Durgin
2012-05-23 8:20 ` Stefan Priebe - Profihost AG
2012-05-23 8:29 ` Josh Durgin
2012-05-23 7:22 ` Andrey Korolyov
2012-05-23 8:15 ` Stefan Priebe - Profihost AG
2012-05-23 11:47 ` Mark Nelson
2012-05-23 8:30 ` Stefan Priebe - Profihost AG
2012-05-23 9:10 ` Stefan Priebe - Profihost AG
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