I left _limit_shift as the default and that’s the value you’d want to tune.Given he has only 2GB, you could set the write limits higher than I have if you have more RAM. # metadata, so a larger one helps with scrub performance, among other The vdev cache is used to hold pre-fetched # since we only have lowly 5400RPM SATA drives in this thing
# Set maximum oustanding vdev I/O to "1" to prevent parallel reads/writes # Commit async writes after 1 minute if the write limit hasn't been met # is appropriate, so we're not going to change that here. # with 2GB RAM such as this one results in a write_limit_max of 256MB, which # Default _limit_shift appears to be "3" which on a system
# Set a minimum write limit of 50MB which is slightly more than the default # Dynamically adjust write limit based on previous txg commits to attempt Wyze uses this tuning on his 2GB NAS box. See also IBM ServeRAID M1015 Part 4: Cross flashing to a LSI9211-8i in IT or IR mode and LSI Controller FW updates IR/IT modes. This is also an interesting read and contains a tip about configuring Boot Support on your board post-upgrade.Īfter upgrading, this is how the card looks: I started a discussion on this topic in the FreeBSD Forums. I also found this post talking about number devices and remembering them. The card in question (as taken from /var/run/dmesg.boot) is: This particular process seems to have many more moving parts. I’ve flashed firmware before, but it mostly consisted of burning a CD and booting from it. More recently, I found the Flashing IT Firmware to the LSI SAS9211-8i HBA post. And I’ve read it about it on the From 32 to 2 ports: Ideal SATA/SAS Controllers for ZFS & Linux MD RAID post. In order to use the disks in strictly passthrough mode and avoid having any metadata written to them by the card, the card needs to be changed over to IT (Initiator Target) firmware. The LSI 9211-8i 6Gb/s SATA +SAS HBA, which I recently obtained, is running the stock IR (Integrated RAID) firmware.
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