Date: Tue, 20 Mar 2007 14:51:53 +0000 From: vladimir konrad <v.konrad@lse.ac.uk> To: freebsd-amd64@freebsd.org Subject: Re: SATA RAID: 3ware vs. Promise Message-ID: <20070320145153.53f83eea@whirpool.lse.ac.uk> In-Reply-To: <45FFDF5A.3050701@wp.pl> References: <45FE7615.3090606@icyb.net.ua> <45FFDF5A.3050701@wp.pl>
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i know this is about different promise controller to mine (and also under different operating system) but here is my experience. i am using promise ex8350 under debian linux (sarge) and the 2.6.20.1 kernel (one >2TB raid 6 array). one problem i am experiencing that it cannot sustain write performance. if i do: cat /dev/zero > /directory-on-the-raid-conntroller/out.tmp the write speed is ok to begin with but after about 20 seconds it drops to about 1MB/s. if i do the same on different machine (with software raid 5), it will keep going at around 20MB/s (this one is a slow box). the last message i sent to promise support on 7 march 2007 (with more information, like bios, firmware versions and such) is still unanswered (i hate that). it could be driver/firmware/bios settings or incompatibility but as promise did not respond to the last query, i cannot tell. personally, given a chance i would try something else then promised stuff next time... vlad
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