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Forum Discussion
how does the EDA500 work? and safety from disk failures
Hello, I'm wondering how the EDA500 works. Does it simply provide more bays as if they were incorporated in the base unit chassis, or can you have an additional protected set of disks? (for examp...
checksumming doesn't recover misread bits, all it does is allow the problem to be detected. So you'd still depend on the underlying RAID for repair. The checksum in principle could let you tell which block was actually bad (since you can regenerate each block from the others, and see which one results in the correct checksum).
In all raid arrays, the risk of failure rises as the number of disks in the data volume goes up. RAID-1 pairs are better than RAID-5 for protection, but they also reduce the potential volume size. So there is a tradeoff.
I'm not sure if I would use an EDA500 as a backup for the main NAS or not - I think I'd rather have the backup on a completely different device, and use the EDA500 for expansion. Though I wouldn't want to put the EDA500 disks into the same array as the main NAS. Separate volumes (as mdgm suggests) seems safer.
In all raid arrays, the risk of failure rises as the number of disks in the data volume goes up. RAID-1 pairs are better than RAID-5 for protection, but they also reduce the potential volume size. So there is a tradeoff.
I'm not sure if I would use an EDA500 as a backup for the main NAS or not - I think I'd rather have the backup on a completely different device, and use the EDA500 for expansion. Though I wouldn't want to put the EDA500 disks into the same array as the main NAS. Separate volumes (as mdgm suggests) seems safer.
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