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The only way you're getting 3-500MB/s on a 4-disk ZFS RAID5/raidz is with very, very fast SSDs and a very, very fast CPU. Not exactly "very cheap". (The compu
by trentnelson 11y ago
The only way you're getting 3-500MB/s on a 4-disk ZFS RAID5/raidz is with very, very fast SSDs and a very, very fast CPU. Not exactly "very cheap". (The compute and I/O overhead for raidz is significant.)
- mitchty 11y agoYep, i have some wd red 3tb drives in a raidz6 pool. At best I can get 60m/s out of it. Each drive can do about 100m/s sequential but that is rare. Putting an ssd on for caching read/writes though really changes the calculus of this.
- illamint 11y agoThis is... not my experience at all. I have a RAIDZ2 comprised of 6 4TB Seagate drives (the 5900RPM variety) and it can do about 600MBps read/write with moderate CPU usage on an Intel i3. A mirrored zpool of two Samsung 850 EVO SSDs can do nearly 1GBps read/write. That's not a particularly expensive setup.
- trentnelson 11y ago600MB/s write over 6 drives in RAID-Z2 is very good on an i3.
- noja 11y agozfs maybe not, but btrfs does it.