Date: Thu, 13 Aug 2009 12:37:27 -0500 From: Scott Lambert <lambert@lambertfam.org> To: FreeBSD Performance <freebsd-performance@freebsd.org> Subject: Re: Very slow I/O performance on HP BL465c Message-ID: <20090813173727.GF91291@sysmon.tcworks.net> In-Reply-To: <4A83A61E.6010009@bulinfo.net> References: <C6A9D3EE.5E90%nathan@lenevez.net.au> <4A83A61E.6010009@bulinfo.net>
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> Nathan Le Nevez wrote: > > I?m fairly certain this is a hardware problem ? swapping the disks from > > a known working install on another blade produced the same lousy > > performance. > > >>>> Hi, > >>>> > >>>> I'm running 7.2-p3 on 2x HP BL465c blade servers, one of which > >>>> performs very poorly. Both have the same RAID controller and 2 x > >>>> 146GB 10k SAS disks configured in RAID-1. Both controllers have > >>>> write-cache enabled. Both servers are running the same BIOS and > >>>> firmware versions. Neither servers are running any services other > >>>> than sshd. > >>>> > >>>> Blade with good performance (2 x Opteron 2218, 8GB RAM): > >>>> > >>>> Blade with bad performance (2 x Opteron 2352, 16GB RAM): > >>>> > >>>> # dbench -t 10 1 2 3 4 > >>>> blade1 183.456 MB/sec 236.86 MB/sec 299.28 MB/sec 192.675 MB/sec > >>>> blade2 6.97931 MB/sec 9.42293 MB/sec 10.2482 MB/sec 12.407 MB/sec Sorry, I deleted the start of this thread. I figured someone else would suggest pulling half the RAM in the slow server. That seems to be the biggest difference in configuration, other than CPU model. I don't know that it could cause this problem, but it would seem to be easy enough to test if they are not in production, yet. Just grasping at staws here... -- Scott Lambert KC5MLE Unix SysAdmin lambert@lambertfam.org
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