On Fri, 16 Dec 2005 at 3:39pm, Gene Heskett wrote
On Friday 16 December 2005 13:30, Joshua Baker-LePain wrote:
I've got a 4 disk SATA RAID0 on a 3ware controller for the holding
disk.
And what speeds are reported by "hdparm -tT /dev/md0"?
How about bonnie++ numbers (thus including FS performance, and ext3 ain't
all that stellar a performer):
[jlb@youknowwho jlb]$ bonnie++ -f -s 4096
Version 1.03 ------Sequential Output------ --Sequential Input- --Random-
-Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
youknowwho.egr.d 4G 157490 74 76721 26 193369 29 361.7 1
------Sequential Create------ --------Random Create--------
-Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 1359 72 +++++ +++ +++++ +++ 2050 99 +++++ +++ 6848 98
Yep. In my case, the library is the only thing on the SCSI chain.
Which means the data has to piped thru the pci bus, so the maximum on a
non-pci-x buss is 133MB/sec. And the average will be somethat less
Not true. Standard PCI goes up to 64bit/66MHz, which translates to
500MB/s. The 3ware card is 64/66. The SCSI card is PCI-X at
64bit/133MHz, which is >1000MB/s.
than that when the handshaking is factored in. But only 2.5MB/Sec
says there is a very small pinhole someplace its being forced through.
Oh yes, indeed.
--
Joshua Baker-LePain
Department of Biomedical Engineering
Duke University
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