On Tue, Sep 08, 2015 at 01:59:19PM +0200, Peter Keše wrote: > > I'm planning to set up a raid6 array with 4 x 4TB drives. > Presumably that would result in 8TB of usable space + parity, which > is about enough for my data (my data is currently 5TB in raid1, > slowly growing at about 1 TB per year, but I often keep some > additional backups if space permits). > > However I'd like to be prepared for a disk failure. Because my > server is not easily accessible and disk replacement times can be > long, I'm considering the idea of making a 5-drive raid6, thus > getting 12TB useable space + parity. In this case, the extra 4TB > drive would serve as some sort of a hot spare. > > My assumption is that if one hard drive fails before the volume is > more than 8TB full, I can just rebalance and resize the volume from > 12 TB back to 8 TB essentially going from 5-drive raid6 to 4-drive > raid6). > > Can anyone confirm my assumption? Can I indeed rebalance from > 5-drive raid6 to 4-drive raid6 if the volume is not too big?
Yes, you can, provided, as you say, the data is small enough to fit into the reduced filesystem. Hugo. -- Hugo Mills | "What's so bad about being drunk?" hugo@... carfax.org.uk | "You ask a glass of water" http://carfax.org.uk/ | Arthur & Ford PGP: E2AB1DE4 | The Hitch-Hiker's Guide to the Galaxy
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