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Full Discussion: Extremely slow file writing with many small files on mounted NAS
Top Forums UNIX for Dummies Questions & Answers Extremely slow file writing with many small files on mounted NAS Post 302946768 by bakunin on Friday 12th of June 2015 03:18:11 AM
Old 06-12-2015
There are only so many components involved, so the debugging should be straightforward:

How is the NAS connected to your system? I suppose it is an NFS-mount, no?

If so, the following has to be checked:

- network equipment: scp a larger file somewhere to test. Measure time.
- name resolution: put NAS server into /etc/hosts and have local files (=/etc/hosts) take precedence over DNS in /etc/resolv.conf
- mount options: look carefully how the FS from the NAS is mounted. Typical problems include CIO (concurrent I/O), user authentication via outside sources (i.e. user authorization via Kerberos and a slow, unresponsive Kerberos server) and the like.

- If you use NFSv4 (you shouldn't - it is crap) check the NFS-domain. It has to be set on every client and server.

I hope this helps.

bakunin
 

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LEARN ABOUT OSX

showmount

SHOWMOUNT(8)						    BSD System Manager's Manual 					      SHOWMOUNT(8)

NAME

     showmount -- show remote NFS mounts on host

SYNOPSIS

     showmount [-Ae36] [-a | -d] [host]

DESCRIPTION

     showmount shows status information about the NFS server on host.  By default it prints the names of all hosts that have NFS file systems
     mounted on the host. See NFS: Network File System Protocol Specification, RFC 1094, Appendix A, and NFS: Network File System Version 3
     Protocol Specification, Appendix I, for a detailed description of the protocol.

     -A      Search for NFS servers advertised via Bonjour.

     -a      List all mount points in the form: host:dirpath

     -d      List directory paths of mount points instead of hosts.

     -e      Show the host's exports list.

     -3      Use mount protocol Version 3, compatible with NFS Version 3.

     -6      Use only IPv6 addresses to contact servers.

SEE ALSO

     mount(1), mountd(8), nfsd(8), mDNSResponder(8)

BUGS

     The mount daemon running on the server only has an idea of the actual mounts, since the NFS server is stateless.  showmount will only display
     the information as accurately as the mount daemon reports it.

HISTORY

     The showmount utility first appeared in 4.4BSD.

4th Berkeley Distribution					September 26, 2010					 4th Berkeley Distribution
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