On Fri, 28 Aug 2015 10:50:12 +0200 George Duffield <forumscollect...@gmail.com> wrote:
> Running a traditional raid5 array of that size is statistically > guaranteed to fail in the event of a rebuild. Yeah I consider RAID5 to be safe up to about 4 devices. As you already have 5 and looking to expand, I'd recommend going RAID6. The "fail on rebuild" issue is almost completely mitigated by it, perhaps up to a dozen of drives or more. Don't know about your usage scenarios, but as for me the loss of storage efficiency in RAID10 compared to RAID6 in unacceptable, and I also don't need the performance benefits of RAID10 at all. So both from the efficiency and stability standpoints my personal choice currently is Btrfs single device mode on top of MD RAID5 (in a 4 drive array) and RAID6 (with 7 drives). -- With respect, Roman
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