Messages in this thread | | | Subject | Re: Linux SATA RAID FAQ | From | Alan Cox <> | Date | Sat, 14 Aug 2004 16:21:53 +0100 |
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On Sad, 2004-08-14 at 01:31, J. Ryan Earl wrote: > On the brightside, md raid5 is often faster than hardware raid5. At > least on the 7000 and 8000 series of 3ware hardware; the 9000 series > looks promising though. I haven't seen megaraid SATA numbers, and I > don't know what happened to the SX8.
Be cautious what you measure. One of he problems until you reach PCI-X is PCI bandwidth. Thus software md5 can look good but the moment its combined with other PCI activity goes down the pan entirely.
> When the libata Marvell drivers come out, you'll have a cheap upgrade > path for PCI-X boards if you want fast md raid:
Agreed. PCI-X will change a lot of this for boxes that are not very cpu/memory limited. - 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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