hi, I seem to remember hearing an anecdote somewhere that using hundreds (or thousands?) nullfs mounts for jails results in unreasonably bad file system access performance. Does somebody have this kind of setup / is it true?
Ivan Voras wrote:> I seem to remember hearing an anecdote somewhere that using hundreds > (or thousands?) nullfs mounts for jails results in unreasonably bad > file system access performance. Does somebody have this kind of setup > / is it true?I'm using about several readonly nullfs mounts per jail: usr, bin sbin, lib, libexec, with ~20 jails per machine, and the speed is just fine, on 7.0-STABLE. - Andrew
2009/3/10 Ivan Voras <ivoras@freebsd.org>:> hi, > I seem to remember hearing an anecdote somewhere that using hundreds > (or thousands?) nullfs mounts for jails results in unreasonably bad > file system access performance. Does somebody have this kind of setup > / is it true?~600-700 null mount points (without using jails) on 6.2. No visible fs slowdowns. -- wbr, pluknet
Ivan Voras wrote:> hi, > I seem to remember hearing an anecdote somewhere that using hundreds > (or thousands?) nullfs mounts for jails results in unreasonably bad > file system access performance. Does somebody have this kind of setup > / is it true?I was doing this with jails --before we moved to VMware ESX (for better or worse)-- and didn't see any noticeable performance degradation at the time (6.x series). For those interested, the biggest plus for going to the ESX model is that it decoupled low utilization Windows boxes from over-spec'ed hardware and made it available for FreeBSD to use ;-). The downsides are that it's proprietary, it's expensive, it's inefficient (e.g. duplicated files and kernel instances everywhere), and you need freak'in Windows boxes to manage it. -- Russell A. Jackson <raj@csub.edu> Network Analyst California State University, Bakersfield The first thing I do in the morning is brush my teeth and sharpen my tongue. -- Dorothy Parker -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 258 bytes Desc: OpenPGP digital signature Url : http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20090311/5b465e1f/signature.pgp