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Forum Discussion
NAS104 Raid decision? Xraid vs Raid 10 etc #24296869
I just got a NAS 104 and installed 4 3TB Western Digital Red disks. Since I bought all my drives I don't really plan to upgrade or mess with the drives in the near future. When I powered up and ...
Your 20 hour RAID-10 initialization seems more typical. I've gotten about 12 hours when I've replaced a 3 TB drive in my pro-6. I haven't initialized with RAID-6 - in principle the RAID mode shouldn't matter much, since the two parity blocks are always the same, so they don't need to be recomputed. Though if they are computed over and over, it likely will take somewhat longer. Note that RAID initialization requires all sectors in the volume to either to read or written (even if they are not in use).
XRAID is standard RAID-1 or RAID-5 (if disks are different sizes, then some layers are RAID-5 and others are RAID-1). So optimizing XRAID means optimizing both those modes.
RAID-6 isn't a gimmick, and there are netgear folks here (mdgm for one) who frequently recommend it. Though usually folks are using it on x86 platforms like the ultra, pro, RN300 or RN500. Initialization is rare, the benchmark afterwords is more useful for understanding performance.
On the performance side, the write penalty in the original review was mostly due to the btrfs copy-on-write. That increases data safefy. Otherwise write speeds for RAID-1 should be about the same as read speeds.
What did you see with RAID-10 btw?
XRAID is standard RAID-1 or RAID-5 (if disks are different sizes, then some layers are RAID-5 and others are RAID-1). So optimizing XRAID means optimizing both those modes.
RAID-6 isn't a gimmick, and there are netgear folks here (mdgm for one) who frequently recommend it. Though usually folks are using it on x86 platforms like the ultra, pro, RN300 or RN500. Initialization is rare, the benchmark afterwords is more useful for understanding performance.
On the performance side, the write penalty in the original review was mostly due to the btrfs copy-on-write. That increases data safefy. Otherwise write speeds for RAID-1 should be about the same as read speeds.
What did you see with RAID-10 btw?
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