Date: Wed, 31 Mar 2004 00:42:49 -0800 (PST) From: Tom <tom@sdf.com> To: Nick Twaddell <nick@webspacesolutions.com> Cc: freebsd-scsi@freebsd.org Subject: Re: Raid drive speeds Message-ID: <20040331004147.R2493@light.sdf.com> In-Reply-To: <20040331052015.B0CCC43D45@mx1.FreeBSD.org> References: <20040331052015.B0CCC43D45@mx1.FreeBSD.org>
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On Tue, 30 Mar 2004, Nick Twaddell wrote: > I just connected to maxtor atlas 15k 73gig drives to my adaptec 2120S > controller. On boot this is what it says > > pass0: <F6C6OR ATLAS15K_73SCA DSE2> Fixed unknown SCSI-3 device > pass0: 160.000MB/s transfers (80.000MHz, offset 127, 16bit) > pass1 at aacp0 bus 0 target 1 lun 0 > pass1: <8737OR ATLAS15K_73SCA DP60> Fixed unknown SCSI-3 device > pass1: 26.400MB/s transfers (64bit) > > Why does it say one drive is 160MB transfers, and the other is 26.400MB > transfers. Both drives are ultra320 and they seem to show up as ultra320 in > the adaptec bios? I find it strange that the pass-through driver is even probing disks for you. The RAID controller typically hides physical disk from the OS. Tom
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