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Luis Paulo wrote:
> Hi, Adam
> 38.3 MB/s seems a very high speed for old IDE disks through NFS
Sorry, that is a RAID1 array made up of these two disks (cat
/proc/hd[ac]/model):
WDC WD800JB-00ETA0 8M cache
WDC WD800JB-00ETA0 8M cache
Specs available at
http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/std_adp.php?p_faqid=699
> I'll expect that speed measuring the disk on the machine, not through
> the home LAN
No, it is definitely speed over the LAN. The machine I was testing from
is a diskless system, so it has no local HDD at all. Definitely testing
over NFS.
> Thanks for the command. I think of=/tmp/test may be wrong. Or not, I'm
> really no expert here.
of=/tmp/test specifies the output file (of=) as /tmp/test which is just
a scratch file.... It will overwrite the existing file if it exists.
> I have a similar configuration (2x250 SATA1 local disks with lvm/mdadm),
> and I'm interested on NAS, not for backuppc (not for now, at least)
> 104857600 bytes (105 MB) copied, 10.8521 s, 9.7 MB/s (NFS mount)
Locally on the NFS server I get varying results (this is under a live load!)
104857600 bytes (105 MB) copied, 8.99671 s, 11.7 MB/s
104857600 bytes (105 MB) copied, 2.14727 s, 48.8 MB/s
104857600 bytes (105 MB) copied, 5.18016 s, 20.2 MB/s
104857600 bytes (105 MB) copied, 2.097 s, 50.0 MB/s
Each run done a few seconds apart. I don't think cacheing is an issue
here, cache should be much faster than that!
nfsserver:/proc/ide# hdparm -tT /dev/md0 (the RAID array)
/dev/md0:
Timing cached reads: 454 MB in 2.00 seconds = 226.61 MB/sec
Timing buffered disk reads: 104 MB in 3.01 seconds = 34.49 MB/sec
> I also have a running 100Mb LAN, shouldn't we start there? How to get a
> 1Gb LAN, that is, maybe the NAS speed are limited by that.
Well, on a 100M LAN, you are looking at a max speed of around
10MegaBytes/sec... This is way under the desired performance ... hence
I've upgraded my switch plus ethernet cards to operate at 1G which
should give approx 100MegaBytes/sec transfer speed.
> Forgive if I said something very stupid.
No problem, just trying to get some decent performance out of this. BTW,
I've also got other issues with the device that I am working through
with netgear (slowly)...
Regards,
Adam
- --
Adam Goryachev
Website Managers
www.websitemanagers.com.au
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