Todd Takehana
Cadet
- Joined
- Apr 6, 2017
- Messages
- 4
Before setting up a new NAS, mainly for Plex, I wanted to try FreeNAS 11.1 and some hardware I have sitting around.
Strangely I am getting about half the read speed as write speed when testing with dd or bonnie++
Setup is 4x3TB Hitachi 7200 ALA640 SATA HDDs connected via a Dell H200 Perc adapter in IT mode (HBA, no RAID) on a Supermicro X11-DPH-i motherboard with 2 x Xeon CPUs and 16 GB of ECC DDR4 RAM. Boot disk is a 32GB Sandisk USB drive. The hard drives are set up as a RAIDZ1 (~7.6TB).
With dd (where bs x counts > installed RAM), I get about 575 MB/s write speed. After clearing cache and reading back the the written file, I get about 230 MB/s read speed. On sequential transfers, each drive is around 160MB/s in either write or read. Thus, 575 MB/s write seems reasonable, but the read speed seems way off.
Any ideas on what might be causing this?
Strangely I am getting about half the read speed as write speed when testing with dd or bonnie++
Setup is 4x3TB Hitachi 7200 ALA640 SATA HDDs connected via a Dell H200 Perc adapter in IT mode (HBA, no RAID) on a Supermicro X11-DPH-i motherboard with 2 x Xeon CPUs and 16 GB of ECC DDR4 RAM. Boot disk is a 32GB Sandisk USB drive. The hard drives are set up as a RAIDZ1 (~7.6TB).
With dd (where bs x counts > installed RAM), I get about 575 MB/s write speed. After clearing cache and reading back the the written file, I get about 230 MB/s read speed. On sequential transfers, each drive is around 160MB/s in either write or read. Thus, 575 MB/s write seems reasonable, but the read speed seems way off.
Any ideas on what might be causing this?