NFS / DAS / SAN / NAS - Which is best? Post: 302913565

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Top Forums UNIX for Dummies Questions & Answers NFS / DAS / SAN / NAS - Which is best? Post 302913565 by bakunin on Monday 18th of August 2014 01:08:08 PM

08-18-2014

Registered User

Quote:

Originally Posted by SkySmart

i've used only NFS and as many already found out, it can be or rather i should say, it is very unreliable.

NFS is very reliable - it just wasn't made to replace locally mounted filesystems. NFS is great, for instance, if you export a share with some files, mount it on a remote system, install the files there and then unmount the share again. If you use it to mount 200 GB in 20 filesystems to a remote system and start a database from there you are simply using the wrong tool for the wrong purpose.

Quote:

Originally Posted by SkySmart

based on the collective experiences of the members on this board, i would really appreciate it if someone can tell me what the next best file sharing method is?

Based on your experience, can you tell me what the best method of transportation is? Cars? Bikes? Aeroplanes? Rockets?

I'd say that depends: a car might get you comfortably from home to work and back, but if you want to get to the moon it is probably advisable to use a rocket instead. But if you "only" want to go transcontinental you might be more comfortable using an Airbus A340 instead of a Saturn V, etc..

Each of your mentioned methods have pros and cons and which one is the most fit for your purpose depends heavily upon what purpose that is.

How much data are talking about? Gigabytes? Some TBs? Several hundred TB, up to 1 PB?

How much bandwidth are we talking? Several high-performance real-time-processing OLTP platforms? Cloud computing?

How is this bandwidth used? Many small transactions, like a OLTP? Streams like in a streaming server? Large continuous blocksize reads/writes like a ftp-server? Small blocksize random access like the typical DB/2-LUW?

How much interoperation/data transfer is needed between the different hosts? If the answer is "very much" the answer might be "GPFS", regardless of what storae you use.

What about backup?

What about data replication?

What about snapshots?

I am sure that - off the top of my head - i didn't even ask half of the necessary questions, as others will surely point out. The list above is merely meant to show you how much questions you will first have to ask and answer before you can expect us to give you any competent advice.

I hope this helps.

bakunin

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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