Messages in this thread | | | Date | Fri, 03 Sep 2004 12:33:30 -0400 | From | Mark Lord <> | Subject | Re: md RAID over SATA performance |
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Even with hardware RAID the numbers I see are not often much better than this.
Unless O_DIRECT is used (hdparm --direct), in which case they immediately jump to a level that is more limited by the PCI and memory speeds of the system.
Eg. 205Mbytes/sec for a 4-drive RAID0 over 64-bit/66Mhz PCI.
I guess the page_cache overhead is rather substantial for the simple read-a-sequential-block test.
Cheers -- Mark Lord (hdparm keeper & the original "Linux IDE Guy") - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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