NFS rwsize testing

[aufalien]

Does any one know of a way to have FreeNAS/TrueNAS support NFS read/write sizes of 1M?

I wish to do some testing as my Linux clients to Linux Servers work very well at 1M in my environment.

Hoping to have similar results with Linux clients to FreeNAS/TrueNAS servers as well.

I'm running a mix of the latest FreeNAS and the latest TrueNAS.

Thanks in advance.

 

[sretalla]

Maybe there are some clues here for you:

Recommended Options for Mounting NFS Shares

I have very little experience with NFS shares, so I am looking for guidance as to the best options to use on my mount statement in /etc/fstab . I have 2 shares defined in freenas, a RO share and a RW share. I have been mounting the shares with "default" options just to get things workking...

www.truenas.com

 

[aufalien]

Thanks for the reply.

It seems that FreeNAS/TrueNAS servers only support a max read/write size of 131072. I'd like to see if it's possible vis a sysctl etc.. to increase that to 1048576. But I can't seem to find much info on this.

 

[Samuel Tai]

This very old thread suggests 131072 is a hard-coded maximum. I suspect this is inherited from upstream FreeBSD. See https://forums.freebsd.org/threads/nfs-client-rsize-wsize-limit-and-performance.59785/.

 

[aufalien]

Ah thanks Sam. Yep bingo, that looks to be it. My goal to match ZFS record size with NFS read/write size and see if any serving improvements occur.

Is this case, I should work within the lowest common denominator and set my ZFS record size to 131072.

I've read some Oracle ZFS docs that suggest this.

 

[HoneyBadger]

If you're working with very large files, keep your ZFS recordsize at the current 1M because you'll gain benefits in the internal housekeeping/metadata aspects of ZFS. It'll still have to fragment them down to 128K to ship them over NFS but you'll at least have the internal benefits of recordsize=1M.

 

[aufalien]

Ah thanks HoneyBadger. Will do.

I've a feeling that FreeBSD is it what is in terms of NFS r/w sizes.

How flexible and willing do you think the TrueNAS team is in terms of fielding a feature request to roll out a custom kernel that supports 1048576 NFS r/w sizes?

 

[Samuel Tai]

You're welcome to submit a feature request, although I think they'll be busy with getting U3 out.

 

[aufalien]

Thanks Sam. Agreed, I'd hate to burden with use cases which may only be niché. I recall asking about RDMA support a while back which was also not something in large acceptance. I imagine any submission may be met with a bit of stress, sorta like piling on. At any rate I'll mull it over.

 

[aufalien]

Hi Sam,

I submitted it as a suggestion under ticket NAS-109489.

https://jira.ixsystems.com/browse/NAS-109489