From: "John Stoffel" <john@stoffel.org>
To: Dallas Clement <dallas.a.clement@gmail.com>
Cc: Mark Knecht <markknecht@gmail.com>,
Phil Turmel <philip@turmel.org>,
Linux-RAID <linux-raid@vger.kernel.org>
Subject: Re: best base / worst case RAID 5,6 write speeds
Date: Fri, 11 Dec 2015 11:32:15 -0500 [thread overview]
Message-ID: <22122.64143.522908.45940@quad.stoffel.home> (raw)
In-Reply-To: <CAE9DZURK+bZ=4czbGojzW815Du1ascr5vzAPtQBw4ZDGyq0MAQ@mail.gmail.com>
>>>>> "Dallas" == Dallas Clement <dallas.a.clement@gmail.com> writes:
Dallas> Hi Mark. I have three different controllers on this
Dallas> motherboard. A Marvell 9485 controls 8 of the disks. And an
Dallas> Intel Cougar Point controls the 4 remaining disks.
What type of PCIe slots are the controllers in? And how fast are the
controllers/drives? Are they SATA1/2/3 drives?
>> If you're spinning in IO loops then it could be a driver issue.
Dallas> It sure is looking like that. I will try to profile the
Dallas> kernel threads today and maybe use blktrace as Phil
Dallas> recommended to see what is going on there.
what kernel aer you running?
Dallas> This is pretty sad that 12 single threaded fio jobs can bring
Dallas> this system to its knees.
I think it might be better to lower the queue depth, you might be just
blowing out the controller caches... hard to know.
next prev parent reply other threads:[~2015-12-11 16:32 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-10 1:34 best base / worst case RAID 5,6 write speeds Dallas Clement
2015-12-10 6:36 ` Alexander Afonyashin
2015-12-10 14:38 ` Dallas Clement
2015-12-10 15:14 ` John Stoffel
2015-12-10 18:40 ` Dallas Clement
[not found] ` <CAK2H+ed+fe5Wr0B=h5AzK5_=ougQtW_6cJcUG_S_cg+WfzDb=Q@mail.gmail.com>
2015-12-10 19:26 ` Dallas Clement
2015-12-10 19:33 ` John Stoffel
2015-12-10 22:19 ` Wols Lists
2015-12-10 19:28 ` John Stoffel
2015-12-10 22:23 ` Wols Lists
2015-12-10 20:06 ` Phil Turmel
2015-12-10 20:09 ` Dallas Clement
2015-12-10 20:29 ` Phil Turmel
2015-12-10 21:14 ` Dallas Clement
2015-12-10 21:32 ` Phil Turmel
[not found] ` <CAK2H+ednN7dCGzcOt8TxgNdhdDA1mN6Xr5P8vQ+Y=-uRoxRksw@mail.gmail.com>
2015-12-11 0:02 ` Dallas Clement
[not found] ` <CAK2H+efF2dM1BsM7kzfTxMdQEHvbWRaVe7zJLTGcPZzafn2M6A@mail.gmail.com>
2015-12-11 0:41 ` Dallas Clement
2015-12-11 1:19 ` Dallas Clement
[not found] ` <CAK2H+ec-zMbhxoFyHXLkdM-z-9cYYzNbPFhn19XjTHqrOMDZKQ@mail.gmail.com>
2015-12-11 15:44 ` Dallas Clement
2015-12-11 16:32 ` John Stoffel [this message]
2015-12-11 16:47 ` Dallas Clement
2015-12-11 19:34 ` John Stoffel
2015-12-11 21:24 ` Dallas Clement
2015-12-11 23:30 ` Dallas Clement
2015-12-12 0:00 ` Dallas Clement
2015-12-12 0:38 ` Phil Turmel
2015-12-12 2:55 ` Dallas Clement
2015-12-12 4:47 ` Phil Turmel
2015-12-14 20:14 ` Dallas Clement
[not found] ` <CAK2H+edazVORrVovWDeTA8DmqUL+5HRH-AcRwg8KkMas=o+Cog@mail.gmail.com>
2015-12-14 20:55 ` Dallas Clement
[not found] ` <CAK2H+ed-3Z8SR20t8rpt3Fb48c3X2Jft=qZoiY9emC2nQww1xQ@mail.gmail.com>
2015-12-14 21:20 ` Dallas Clement
2015-12-14 22:05 ` Dallas Clement
2015-12-14 22:31 ` Tommy Apel
[not found] ` <CAK2H+ecMvDLdYLhMtMQbP7Ygw-VohG7LGZ2n7H+LAXQ1waJK3A@mail.gmail.com>
2015-12-14 23:25 ` Dallas Clement
2015-12-15 2:36 ` Dallas Clement
2015-12-15 13:53 ` Phil Turmel
2015-12-15 14:09 ` Robert Kierski
2015-12-15 15:14 ` John Stoffel
2015-12-15 17:30 ` Dallas Clement
2015-12-15 19:22 ` Phil Turmel
2015-12-15 19:44 ` Dallas Clement
2015-12-15 19:52 ` Phil Turmel
2015-12-15 21:54 ` John Stoffel
2015-12-15 23:07 ` Dallas Clement
2015-12-16 15:31 ` Dallas Clement
[not found] ` <CAK2H+eeD2k4yzuvL4uF_qKycp6A=XPe8pVF_J-7Agi8Ze89PPQ@mail.gmail.com>
2015-12-17 5:57 ` Dallas Clement
2015-12-17 13:41 ` Phil Turmel
2015-12-17 21:08 ` Dallas Clement
2015-12-17 22:40 ` Phil Turmel
2015-12-17 23:28 ` Dallas Clement
2015-12-18 0:54 ` Dallas Clement
[not found] ` <CAFx4rwT8xgwZ0OWaLLsZvhMskiwmY54MzHgnnEPaswByeRrXxQ@mail.gmail.com>
2015-12-22 6:15 ` Doug Dumitru
2015-12-22 14:34 ` Robert Kierski
2015-12-22 16:48 ` Dallas Clement
2015-12-22 18:33 ` Doug Dumitru
2016-01-04 18:56 ` Robert Kierski
2016-01-04 19:13 ` Doug Dumitru
2016-01-04 19:33 ` Robert Kierski
2016-01-04 19:43 ` Doug Dumitru
2016-01-15 16:53 ` Robert Kierski
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