Complexity of FreeBSD VFS using ZFS as an example

Interesting to see some technical details of FreeBSD's VFS layer, I've never delved too deeply into it myself but I have looked at Linux's so it's not completely unfamiliar to me.

Re: Complexity of FreeBSD VFS using ZFS as an example

#5

Post by andyjpb » Wed, Jan 15, 2014, 3:26 PM UTC

lewq wrote: post #2

Happy to take any questions :-)

Have you read the VFS Chapter in Beautiful Code?

Re: Complexity of FreeBSD VFS using ZFS as an example

#6

Post by lewq » Wed, Jan 15, 2014, 3:39 PM UTC

jeffreyparker wrote: post #3

lewq wrote: post #2

Happy to take any questions :-)

As a very happy ZFS on FreeBSD user, thank you for all of your work!

On behalf of Andriy and the rest of the FreeBSD/ZFS community, you're welcome! :)

Re: Complexity of FreeBSD VFS using ZFS as an example

#7

Post by jfb » Wed, Jan 15, 2014, 3:52 PM UTC

This was very interesting, thanks. Sorta-OT, I wonder if there's a modern equivalent of Vahalia's Unix Internals: The New Frontiers [1]?

[1] http://www.goodreads.com/book/show/337378.UNIX_Internals

Re: Complexity of FreeBSD VFS using ZFS as an example

#8

Post by lewq » Wed, Jan 15, 2014, 3:56 PM UTC

andyjpb wrote: post #5

lewq wrote: post #2

Happy to take any questions :-)

Have you read the VFS Chapter in Beautiful Code?

Not yet! :)

Re: Complexity of FreeBSD VFS using ZFS as an example

#9

Post by olavgg » Wed, Jan 15, 2014, 4:08 PM UTC

lewq wrote: post #2

Happy to take any questions :-)

I'm also a very happy ZFS user on FreeBSD. I've tried to use it in a lot of crazy ways. At the moment I'm researching if ZFS and a virtual machine running Microsoft SQL Server can improve query performance(with LZ4/GZIP compression) and improve the backup speed.

Though I'm wondering about if there are any plans to add XZ compression? Or faster hashing with Siphash24 for data checksums?

Re: Complexity of FreeBSD VFS using ZFS as an example

#10

Post by Scaevolus » Wed, Jan 15, 2014, 4:44 PM UTC

olavgg wrote: post #9

lewq wrote: post #2

Happy to take any questions :-)

I'm also a very happy ZFS user on FreeBSD. I've tried to use it in a lot of crazy ways. At the moment I'm researching if ZFS and a virtual machine running Microsoft SQL Server can improve query performance(with LZ4/GZIP compression) and improve the backup speed. Though I'm wondering about if there are any plans to add XZ compression? Or faster hashing with Siphash24 for data checksums?

LZMA compression (used in the xz format) is much slower than the disk interface and uses a lot of memory, so it would reduce performance.