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Are file system mounts costly?

I recall a kernel parameter on Unix System V of number
of mounted file systems. Max recommended was 8.
Larger numbers slowed down inode location and
impacted performance.

Has Linux solved that bottleneck? Are 20 or 30 mounted
efs and cifs file systems on one system OK?

Comments

Re: Are file system mounts costly?

By Marian Marinov at 08/16/2011 - 16:29

On Wednesday 03 August 2011 23:29:48 Reynolds McClatchey wrote:
I'm running servers with almost 1500 bind mounts...
Before that I did check when the server performance is impacted.

So what I found was that when you reach around 20000 mounts all commands start
to take a long time to execute.

Best regards,
Marian Marinov