Dan Langille wrote:
Thank you to all the helpful discussion. It's been very helpful and
educational. Based on the advice and suggestions, I'm going to adjust
my original plan as follows.
[ ... ]
Since I still have the medium-sized ZFS array on the bench, testing this
GPT setup seemed like a good idea.
The hardware's a Supermicro X8DTL-iF m/b + 12Gb memory, 2x 5502 Xeons,
3x Supermicro USASLP-L8I 3G SAS controllers and 24x Hitachi 2Tb drives.
Partitioning the drives with the command-line:
gpart add -s 1800G -t freebsd-zfs -l disk00 da0[1] gave the following
results with bonnie-64: (Bonnie -r -s 5000|20000|50000)[2]
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
GB M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU /sec %CPU
5 97.7 92.8 387.2 40.1 341.8 45.7 178.7 81.6 972.4 54.7 335 1.5
20 98.0 87.0 434.9 45.2 320.9 42.5 141.4 87.4 758.0 53.5 178 1.6
50 98.0 92.0 435.7 46.0 325.4 44.7 143.4 93.1 788.6 57.1 140 1.5
Repartitioning with
gpart add -b 1024 -s 1800G -t freebsd-zfs -l disk00 da0[1] gave the
following:
-------Sequential Output-------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
GB M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU /sec %CPU
5 97.8 93.4 424.5 45.4 338.4 46.1 180.0 93.9 934.9 57.8 308 1.5
20 97.6 91.7 448.4 49.2 338.5 45.9 176.1 91.8 914.7 57.3 180 1.3
50 96.3 90.3 452.8 47.6 330.9 44.7 174.8 74.5 917.9 53.6 134 1.2
... So it would seem that bothering to align the blocks does make a
difference.
For an apples/oranges comparison, here's the output from the other box
we built. The hardware's more or less the same - the drive controller's
an Areca-1280, but the OS was Solaris 10.latest:
--------Sequential Output------- ---Sequential Input-- --Random--
-Per Char- --Block--- -Rewrite-- -Per Char- --Block--- --Seeks---
GB M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU M/sec %CPU /sec %CPU
5 116.8 75.0 524.7 65.4 156.3 20.3 161.6 99.2 2924.0 100.0 199999 300.0
20 139.9 95.4 503.5 51.7 106.6 13.4 97.6 62.0 133.0 8.8 346 4.2
50 147.4 95.8 465.8 50.1 106.1 13.5 97.9 62.5 143.8 8.7 195 4.1
[1] da0 - da23, obviously.
[2] Our assumption locally is that the first test is likely just
stressing the bandwidth to memory and the ZFS cache.
--
JH-R
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