Date: Thu, 1 Jan 2009 12:22:57 -0800 From: Joel Jacobson <jjacobson@panasas.com> To: freebsd-current@freebsd.org Subject: gstripe performance oddity Message-ID: <3D76E927-AD4F-4B6E-83E8-44379814FD98@panasas.com>
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i tried sending this to freebsd-geom but got no response, so i'll try a higher traffic superset list... i have a bit of a weird issue, which i suspect is a configuration problem, and was looking for a little advice. i have an LSI JBOD box with a bunch of SAS drives that i would like to gstripe together. each drive individually seems to be able to do about 80 MB/sec streaming write, and doing parallel dd's gives me the 160 MB/sec i would expect. if i gstripe them together with a 256k stripe width, i only see 80 MB/sec, though. if, however, i newfs/mount it as ufs and then dd myself a big file, that gets me about 120-130 MB/sec. why does mounting matter? - j
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