Messages in this thread | | | Date | Fri, 05 Mar 2004 15:58:12 -0800 | From | Mike Fedyk <> | Subject | Re: questions about io scheduler |
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Timothy Miller wrote: > > > Mike Fedyk wrote: > >> Nick Piggin wrote: >> >>> >>> >>> Kyle Wong wrote: >>> >>>> 2. Does io scheduler works with md RAID? Correct me if I'm wrong, >>>> io-schedular <--> md driver <--> harddisks. >>>> >>>> >>> >>> It goes md driver -> io schedulers -> hard disks. >> >> >> >> There is an IO scheduler per disk. >> >> So MD submits the data to each disk through the IO scheduler. >> >> This allows you to have the heads on each disk in the array at >> different locations, and helps keep response times lower for seeky loads. > > > Say you've got a RAID1. In this case, MD could send the read request to > either device. How does it decide which one to use?
The one with the drive head closest to the data. - 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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