Date: Tue, 26 Jul 2005 21:19:36 -0700 From: Glenn Dawson <glenn@antimatter.net> To: Chuck Swiger <cswiger@mac.com>, ".VWV." <victorvittorivonwiktow@interfree.it> Cc: freebsd-questions@freebsd.org Subject: Re: certance DAT Message-ID: <6.1.0.6.2.20050726211444.18e82a00@cobalt.antimatter.net> In-Reply-To: <42E6FCC5.8070309@mac.com> References: <007b01c59251$925c5ca0$98edfea9@workstation> <42E6FCC5.8070309@mac.com>
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At 08:17 PM 7/26/2005, Chuck Swiger wrote: ...so it's not exactly super-zippy, either. Hmm, is it just me, or are the following numbers significantly low for a RAID-1 of two 10K RPM U320 SCSI disks...? >/dev/amrd1 > 512 # sectorsize > 73274490880 # mediasize in bytes (68G) > 143114240 # mediasize in sectors > 8908 # Cylinders according to firmware. > 255 # Heads according to firmware. > 63 # Sectors according to firmware. > >Seek times: > Full stroke: 250 iter in 1.824059 sec = 7.296 msec > Half stroke: 250 iter in 1.805398 sec = 7.222 msec > Quarter stroke: 500 iter in 4.254147 sec = 8.508 msec > Short forward: 400 iter in 2.821081 sec = 7.053 msec > Short backward: 400 iter in 2.860203 sec = 7.151 msec > Seq outer: 2048 iter in 8.821875 sec = 4.308 msec > Seq inner: 2048 iter in 9.006505 sec = 4.398 msec >Transfer rates: > outside: 102400 kbytes in 9.242111 sec = 11080 kbytes/sec > middle: 102400 kbytes in 9.230325 sec = 11094 kbytes/sec > inside: 102400 kbytes in 10.779231 sec = 9500 kbytes/sec > >[ This is running RELENG_5_4... ] I would have expected the transfer rates to be about twice what they're listed as here. Though I don't know how you measured them. If you want to see something interesting, create a ufs1 file system on the same raid 1 using FreeBSD 4.x. Then mount it in 5.x and do your test for transfer rates. Compare that to either ufs1 or ufs2 on the same raid 1 as created by 5.4. The results are very interesting. -Glenn >-- >-Chuck
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