Drives: 8 SATA HDD
Drive capacity: 4TB
Hi, I'm trying to calculate my write and read speed gains by changing layouts on the RAIDZ Calculator and no matter what layout I choose write speed is always unchanged. Does it mean that no matter the layout ZFS only provides the maximum speed of a single drive? Assume there are no any cache or special devices and RAM is limited to 32GB.
This is so much different with what I experienced with RAID10 before where for the same number of drives you can get up to 8x read and 4x write speed gain. I'm not comparing how much more reliable ZFS raid to normal raid is, I'm just curious why ZFS does not give any speed gains just like normal raid without buying 1TB of RAM and high endurance drives (10 DWPD) for special or cache devices.
2 VDEVs in RAIDz1 with 4 drives each vdev:
4 VDEVs in Mirror with 2 drives each vdev:
RAID10 with 8 drives:
Drive capacity: 4TB
Hi, I'm trying to calculate my write and read speed gains by changing layouts on the RAIDZ Calculator and no matter what layout I choose write speed is always unchanged. Does it mean that no matter the layout ZFS only provides the maximum speed of a single drive? Assume there are no any cache or special devices and RAM is limited to 32GB.
This is so much different with what I experienced with RAID10 before where for the same number of drives you can get up to 8x read and 4x write speed gain. I'm not comparing how much more reliable ZFS raid to normal raid is, I'm just curious why ZFS does not give any speed gains just like normal raid without buying 1TB of RAM and high endurance drives (10 DWPD) for special or cache devices.
2 VDEVs in RAIDz1 with 4 drives each vdev:
4 VDEVs in Mirror with 2 drives each vdev:
RAID10 with 8 drives: