Date: Tue, 13 Jun 2000 22:44:42 -0600 From: Wes Peters <wes@softweyr.com> To: Jaye Mathisen <mrcpu@internetcds.com> Cc: hackers@FreeBSD.ORG Subject: Re: Has anybody looked at RAID-5 vinum performance on the "whole system"? Message-ID: <39470DBA.D8045A1A@softweyr.com> References: <Pine.BSF.4.21.0006131635260.11271-100000@schizo.cdsnet.net>
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Jaye Mathisen wrote: > > I was just curious what people's thoughts were on the potential "total > system throughput" (whatever you choose it to be), wrt using software > RAID. > > It would seem that software RAID would just kill big chunks of cache, > especially CPU cache, moving lots of data throught it to calcuate CRC's. > > perhaps the raid 1/0's would be fine, since the calcuation could be > ignored. Greg can probably give a better answer than I can, but one thing to be aware of is that host-based RAID, like Vinum, usually has access to a lot more processor and memory resources than hardware RAID controllers. My experience is limited to running an I/O bound, not compute-bound, server using both Vinum and a Mylex DAC1100 with 64MB RAM, using RAID-1. The system was a DELL 2400 with 2x 600 Mhz Pentium III. The application was a non-interactive web filter running over millions of web pages grabbed by a spider. The total throughput was significantly higher on the software RAID system. The application inherently sloshes through the caches anyhow, so little cache affect is achieved. -- "Where am I, and what am I doing in this handbasket?" Wes Peters Softweyr LLC wes@softweyr.com http://softweyr.com/ To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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