Date: Thu, 24 Jun 2004 16:39:14 +0200 From: Eirik Oeverby <ltning@anduin.net> To: =?ISO-8859-1?Q?S=F8ren_Schmidt?= <sos@DeepCore.dk> Cc: Daniel Eriksson <daniel_k_eriksson@telia.com> Subject: Re: Multiple choices for RAID-0, best performance? Message-ID: <40DAE792.1090701@anduin.net> In-Reply-To: <40DADE69.30702@DeepCore.dk> References: <!~!UENERkVCMDkAAQACAAAAAAAAAAAAAAAAABgAAAAAAAAA0VcX9IoJqUaXPS8MjT1PdsKAAAAQAAAArboJgGwHU0apkIeCcojdKwEAAAAA@telia.com> <40DADE69.30702@DeepCore.dk>
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Søren Schmidt wrote: > Daniel Eriksson wrote: > >> Also, will the RAID-0 performance (transfer speed and/or resource >> usage) of >> ataraid be affected a lot depending on what controller is used? For >> example >> would there be any performance difference between ataraid on a >> HPT374-based >> card (such as the Highpoint RocketRAID 454) and one of the new Promise >> cards >> (which we have really good drivers for afaik). > > > Well, I havn't measured the performance diff between HPT and Promise > lately, but I'm pretty sure Promise wins due to much lower command > overhead. > > However in the not to far future this wil change *significantly*. > ataraid is in the learning phase of using the command sequencer in the > Promise (and Marvell) chips which will boost performance by having the > controllers do some of the RAID work (in case of the pdc20621 chips in > can even do HW XOR for RAID5). > > Needless to say that it will only work with ataraid, as this needs > intimate knowledge of the ATA controller workings to be used effectively. Any chance Silicon Image SATA-RAID chipsets will be supported this way? Some of the heftier Tyan (dual) Opteron boards use this chipset.. I hear from various sources that it sucks, but ... Can't give up hope yet, can I? ;) /Eirik
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