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Forum Discussion
ReadyNAS 104 Convert X-Raid to Flex Raid - will it expand space for data?
Hi, Before I start, my NAS is a media server and im not really bothered about backup and data recovery on it as nothing on it is crutial that it is kept. Having said that I have a lot of data...
This is a good primer on RAID: http://www.thegeekstuff.com/2010/08/raid-levels-tutorial/
It doesn't cover RAID6 in the article, but just imagine RAID5 with an extra disk with another parity block stripe. There's a link to an additional article explaining RAID6 as well.
On a 4-bay NAS such as the 104, it probably makes more sense to have a 5th hard disk as a spare, sitting on the shelf as insurance, rather than run RAID-6. Set up email alerting and get timely notifications on drive failures. There is also a greater write penalty on RAID6 compared to RAID5, as there is the extra parity block write.
itsjasper wrote:
There is also a greater write penalty on RAID6 compared to RAID5, as there is the extra parity block write.
Yes. I wouldn't recommend RAID-6 on the RN104. The Q parity blocks are harder to compute than the simple XOR used for P, and there is a big performance hit.
Keeping a spare drive handy is a good strategy, as it can take a few days for a replacement to arrive.
And of course, backups...
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