Date: Sun, 25 Nov 2007 14:37:52 +0000 From: =?UTF-8?B?6Z+T5a625qiZIEJpbGwgSGFja2Vy?= <askbill@conducive.net> To: freebsd-stable@freebsd.org Subject: Re: SAS5IR performance issue with Dell 860 Message-ID: <474988C0.4070909@conducive.net> In-Reply-To: <47496BE1.8080206@modula.no> References: <47496BE1.8080206@modula.no>
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Espen Tagestad wrote: > Hi, > > We recently bought 3 new Dell 860 servers with the onboard SAS5/IR SATA > RAID-controller. They seem to be quite well spec'ed servers with > management and everything - but I am experiencing av major performance > issue with the disc i/o. On write I get at max 7-8MB/sec, while read > gives a bit more (11MB/sec). I tried first with 6.2-RELEASE, and then > upgraded to 6.3-PRERELEASE without any better results. > > I am aware of some discussion around this issue on these two maillists > in the spring earlier on this year, but I have not been able to find any > good resolution. My old firewall/router at home equipped with a 733Mhz > Pentium 3 processor and a old 40GB IDE harddrive made around year 2001 > performe better. Is there anybody out there with the same problem who > has solved this issue? Could it be that this is solved in 7.0? > > Thanks in advance. > You haven't indicated what drives are on that controller, or how (RAID?) arranged.,, what sort of on-drive or on-controller cahce and policy. Nor how you measured the '..performs better', which a single <anything> can often do compared to several of the possible RAID configurations. Otherwise, those are not actually 'bad' numbers for sustained I/O - especially if anything-at-all is going on at the same time that needs to intervene and move the r/w heads 'elsewhere' - however briefly. More info? Bill
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