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Forum Discussion
X-raid vs. X-raid2
Should I consider updating my 3 current NAS to use X-RAID2 (see sig below)? OK. From the gracious help of Vanderwerwe and StephenB, I have brought back online my old Duo-v2. I chose to ?format/char...
NASNoob wrote: mdgm,Thank you for your share. I learned a new term again; vertical expansion. I take this to mean 'NAS capacity increase.' If so, then I am good...
horizontal expansion - when xraid/xraid2 increases the capacity because you installed a new disk into an empty slot.
vertical expansion - when xraid/xraid2 increases the capacity because you replaced an existing disk with a larger one.
EDIT- same as mdgm's reply...
The advantages of distributed parity apply to raid-5 or raid-6 (3 or more disks). Every time you write to a raid array, the parity block(s) needs to be updated. If all the parity blocks are on a single drive, then this can become a performance bottleneck. Distributing the parity blocks eliminates this possibility; and also evens the I/O load across the drives.
NASNoob wrote: ... I will have to think about the 'distributed parity' scheme of XRAID2. ATM, I do not have a good grasp on this advantage. More research.
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