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[Discuss] NAS: lots of bays vs. lots of boxes
- Subject: [Discuss] NAS: lots of bays vs. lots of boxes
- From: kentborg at borg.org (Kent Borg)
- Date: Fri, 10 Jul 2015 13:13:18 -0400
- In-reply-to: <559FF473.7010405@gmail.com>
- References: <20150703203041.9CCE7E2035@mail2.ihtfp.org> <5598038F.9070408@gmail.com> <sjm8uarevhe.fsf@securerf.ihtfp.org> <559FED8A.9010407@borg.org> <559FF473.7010405@gmail.com>
On 07/10/2015 12:36 PM, Richard Pieri wrote: > The answer to this conundrum is simple: disks are consumables like > toner and paper and batteries. Certainly. But as with batteries, the technology changes, and there are qualitative consequences. For example, the Wikipedia article on RAID says that Dell recommends against RAID 5 with disks 1TB or larger on some Dell product-or-other, because the very act of rebuilding the array will possibly kill other old drives in your array before the data has been copied. RAID 6, as I understand it, is better by surviving two failures, but it only pushes the problem back and probably also becomes too risky with 2015-sized drives. I can imagine someone putting together a swell RAID 5 package of the slickest 8TB disks available, with plenty of spares to be extra safe, and after a couple years of great performance one disk dies and the rest commit suicide over the next few days in a sickening cascade as the array tries to rebuild itself. Performing admirably the entire time!--until the data is lost. Doesn't matter if the 8TB drives cost $50 or $800, they could all die in a horrible capacity-induced pile up, taking some vital 24x7x365 system with it. Declaring "they're consumables!" doesn't answer questions about how one would wisely fill up and use a 24-bay box. -kb
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- [Discuss] NAS: lots of bays vs. lots of boxes
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- [Discuss] NAS: lots of bays vs. lots of boxes
- From: richard.pieri at gmail.com (Richard Pieri)
- [Discuss] NAS: buy vs. build
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