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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LEARN ABOUT LINUX

mount.nfs

MOUNT.NFS(8)                                                  System Manager's Manual                                                 MOUNT.NFS(8)

NAME

       mount.nfs, mount.nfs4 - mount a Network File System

SYNOPSIS

       mount.nfs remotetarget dir [-rvVwfnsh ] [-o options]

DESCRIPTION

       mount.nfs is a part of nfs(5) utilities package, which provides NFS client functionality.

       mount.nfs  is  meant to be used by the mount(8) command for mounting NFS shares. This subcommand, however, can also be used as a standalone
       command with limited functionality.

       remotetarget is a server share usually in the form of servername:/path/to/share.  dir is the directory on which the file system  is  to  be
       mounted.

       Under  Linux  2.6.32  and  later  kernel  versions, mount.nfs can mount all NFS file system versions.  Under earlier Linux kernel versions,
       mount.nfs4 must be used for mounting NFSv4 file systems while mount.nfs must be used for NFSv3 and v2.

OPTIONS

       -r     Mount file system readonly.

       -v     Be verbose.

       -V     Print version.

       -w     Mount file system read-write.

       -f     Fake mount. Don't actually call the mount system call.

       -n     Do not update /etc/mtab.  By default, an entry is created in /etc/mtab for every mounted file system. Use this option to skip making
              an entry.

       -s     Tolerate sloppy mount options rather than fail.

       -h     Print help message.

       nfsoptions
              Refer to nfs(5) or mount(8) manual pages.

NOTE

       For further information please refer nfs(5) and mount(8) manual pages.

FILES

       /etc/fstab        file system table

       /etc/mtab         table of mounted file systems

SEE ALSO

       nfs(5), mount(8),

AUTHOR

       Amit Gud <agud@redhat.com>

                                                                    5 Jun 2006                                                        MOUNT.NFS(8)