Snowflake is evaluating ZFS as a means of providing snapshots for FoundationDB. Because using ZFS will come at a performance cost, we’re interested in how to tune ZFS to minimize that cost.
We’re interested in hearing from anyone has run FDB on ZFS.
What sort of tunables did you set?
logbias? primarycache? recordsize?
How do you manage the tradeoff between ARC size and FDB’s page cache?
What does your pool layout look like?
Since we are only interested in snapshots, we’re looking at using a separate zpool per disk.
did you get any further with this? In general I’d not use a separate zpool per disk as this obviously limits the overall iops of the system, and would make it difficult to get benefits out of a zil or slog.
BTW there’s a FreeBSD foundationdb-devel port now that might be of interest to you, and as soon as FDB 6.3.0 lands (which has cmake for proper C binding support) the main databases/foundationdb one will be updated too.
Hey Dave – I plan to have some test results by the end of the quarter.
Re: FreeBSD – I’ve seen that! Though I’m a big fan of FreeBSD we’re a Linux shop so I’m not testing that platform. The results I get should carry over.