NAS + NFS

John C jcouncilman at knology.net
Tue Apr 30 10:52:01 CDT 2002


I have highmem on some of mine and they seem to run fine....  I use the 3
Gig option, not the biggest option (64 gig I believe).


John

-----Original Message-----
From: Sean McAvoy [mailto:sean.mcavoy at megawheels.com]
Sent: Tuesday, April 30, 2002 10:54 AM
To: John C
Cc: Linux PowerEdge Mailing List
Subject: RE: NAS + NFS


Hello,
I've had some problems lately with the highmem option enabled and XFS.
Do you have any system with XFS and highmem (4gb+ RAM) enabled, and if
so have you had any odd crashing problems? Thanks!

On Tue, 2002-04-30 at 09:43, John C wrote:
> I have several XFS machines and have had no problems with them.
> I'll be glad to run the test for you.
>
> What class of system should I run it on to give you a good comparison?
>
> 1.3 gig, 500 mhz ???
>
> 10,000 RPM HD....?
>
> Actually, it's probably best to run it on your own equipment to get the
best
> numbers.
>
> John
>
> -----Original Message-----
> From: linux-poweredge-admin at dell.com
> [mailto:linux-poweredge-admin at dell.com]On Behalf Of Jerker Nyberg
> Sent: Tuesday, April 30, 2002 6:19 AM
> To: linux-poweredge at dell.com
> Subject: Re: NAS + NFS
>
>
>
> Hello,
>
> Thanks for your answer. Do you know what the performance is for XFS when
> greating many files? There was a discussion in LysKOM conference system
> http://www.lysator.liu.se/lyskom regarding a comparison between different
> filesystems and creation of files in them.
>
>
> If I remember correctly Solaris/VxFS was the best closely followed by
> Linux/ReiserFS (but a too new filesystem to be know as stable yet),
> OnTap/WAFL (Netapp) had a quite strange limit (maybe maximum 10MByte
> directory), Windows/NTFS (Windows) is ok. Some other Unix-filsystems
> (UFS/Ext2/Ext3 etc) are quite bad and get too slow after creation of a
> couple of hundered thousand files.  OS/2 with HPFS was quite ok even on
> old hardware.
>
> Here below is a small program for creating a million files in the current
> directory. Could you or somebody else that have access to a Linux machine
> with XFS try it out to see how long time it takes? As a comparison, on
> ReiserFS it takes under ten minutes and on Ext3 you don't want to wait for
> it to finish. I tried it on GFS, it took an hour or so if I remember
> correctly.
>
> Regards,
> Jerker Nyberg.
>
> - - -
> #!/usr/bin/perl
> $files = 1e6;
> $a = "a";
> push @name , $a++ for 1 .. $files; # Build array of names
> print scalar @name, " names generated.\n";
> print "Starting to create files at ".(scalar localtime)."\n";
> $i=0;                           # Counter for progress bar
> $|=1;                           # Un-buffer STDOUT the old way
> for (@name) {
>     print "*" if ++$i%(($files/80)+0.5)==0; # Print progress
>     open F,">$_" or die "\nCreate failed: $!\n";
> }
> END{print "\nFile creation finished at ".(scalar localtime)."\n";}
> - - -
>
>
>
> On Tue, 30 Apr 2002, Seth Mos wrote:
>
> > I think ReiserFS is still not completely NFS safe. I have lost a
ReiserFS
> > disk once. I am not touching it anymore.
> >
> > XFS has dynamically growing inodes. The defaults are that 25% of the
> > space may be allocated as inodes.
> > Make sure you format it with a larger log if you would use it though. By
> > default you might get a too small one for mail server IO usage.
> > If you also mount the disk with more buffers you can really speed up
more
> > updates.
> >
> > You can get a XFS enabled kernel from the
http://oss.sgi.com/projects/xfs/
> > site or use some the other "developers" kernels out there.
> > The kernels from Andrea Arcangeli and Shawn Starr come to mind.
> >
> > Cheers
> > Seth
> >
> > _______________________________________________
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> > Linux-PowerEdge at dell.com
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> archives at http://lists.us.dell.com/htdig/
> >
>
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--
Sean McAvoy
Network Analyst
Megawheels Technologies Inc.
Phone: 416.360.8211
Fax:   416.360.1403
Cell:  416.616.6599




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