NFS exports priority on server

ionfsqos

I've got a server with several directories shared in exports. One of these exported directories holds home directories, others hold some random data. Is it possible somehow to prioritize i/o coming from network clients to "home" share over the i/o coming to other exports on the server? Now when there is heavy i/o on the "data" shares the "home" share becomes less responsive, and I want the "home" requests always have priority over all other NFS exported paths.

Best Answer

So, taken into account my further trouble shooting.

Upgrade to 10G ethernet, or Multiple 10G ethernet links, using Adapter teaming to get increased bandwidth between server and clients.

Else

Install 1G adapters in NFS server, again team then together for increased bandwidth

Investigate Jumbo packet sizes and optimise NFS Maximum packet sizes.

collect performance information with nfsstat

Else

Break server into two NFS servers (physical or virtual) (home and data) , Do Network QOS based on server ip address.

Else

Read this http://sourceware.org/cluster/doc/nfscookbook.pdf

It has idea's to build a clusters for both load balancing and fault tolerance. It increase the complexity , but you'll be able to keep adding bandwidth as long as you've got the network backbone to cope :-)

I don't think there is a way to do any type of QOS based on NFS,

Related Solutions

Nfs server on cygwin slow

There's been some work recently to speed up directory access, which will be in Cygwin 1.7.8. That's expected to be released some time in January, but you could try the latest snapshots at http://www.cygwin.com/snapshots.

Also, you might want to avoid symlinks in the path, as they cause additional overhead. You could mount the directories in question directly in /etc/fstab, like so:

c:/path/to/dir /disk3 ntfs binary 0 0

You could also try switching off the mapping of POSIX permissions to Windows ACLs (which means that permissions will be faked):

c:/path/to/dir /disk3 ntfs binary,noacl 0 0

See http://cygwin.com/cygwin-ug-net/using.html#mount-table for more on this.

In the end, though, Cygwin/Windows just doesn't make a terribly good server system.

NFS IO priority on ZFS/Solaris

AFAIK, to ZFS all I/O is I/O. What I mean by that is that it won't differentiate between your local operations and the ones NFS is asking ZFS to do.

You could play with the scheduling classes to somehow slow down your userland process that is copying all this data locally.

BTW, your dedicated 1TB disk for write log device won't help you at all, unless that specific disk is much faster than the rest (eg. SATA 7200 vs SAS 15k). We usually use SSDs for log/cache devices, or nothing at all.

Best Answer

Related Solutions

Nfs server on cygwin slow

NFS IO priority on ZFS/Solaris

Related Topic