RE: RAID5
From: Allen, Brandon <Brandon.Allen_at_OneNeck.com>
Date: Thu, 17 Nov 2011 22:43:34 +0000
Message-ID: <A250F0C68C23514CA9F3DF63D60EE10E02C030_at_ONEWS31.oneneck.corp>
Hi Fergal, that would only be true if you created your RAID10 array with twice as many disks as your RAID5 array, but in this case he said he had 5 disks configured as RAID5 and 4 disks configured as RAID10 so that means the RAID10 array can only read from 4 disks at a time, but the RAID5 can read from 5 disks at a time and should be faster if everything else is kept the same. Regards,
Brandon
Date: Thu, 17 Nov 2011 22:43:34 +0000
Message-ID: <A250F0C68C23514CA9F3DF63D60EE10E02C030_at_ONEWS31.oneneck.corp>
Hi Fergal, that would only be true if you created your RAID10 array with twice as many disks as your RAID5 array, but in this case he said he had 5 disks configured as RAID5 and 4 disks configured as RAID10 so that means the RAID10 array can only read from 4 disks at a time, but the RAID5 can read from 5 disks at a time and should be faster if everything else is kept the same. Regards,
Brandon
From: Fergal Taheny [mailto:ftaheny_at_gmail.com]
My understanding and experience is that raid 10 will be much faster for reads too because the data is mirrored and so reads can be done from both sides of the mirror and so read throughput is double that of a non mirrored stripe.
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