Hi,
[apologies for lack of threading headers, I'll sort that out soon. ]
Anyway, Matthew Sackman writes:
> For those of you that use NFS and similar (or different), I've just
> completed an investigation into stability and performance of ENBD
> (similar to DRDB if you know that). If you're interested, the
> report is available at http://www.namkas.com/enbd/
An interesting report. I've not read it fully yet but a couple of points:
* Check the graphs, more specifically the axis labels :-)
* Have you mailed this to Russel Coker, and if not may I?
(he's the author of bonnie++ and would be interested in this).
* Have you tried this with *real* network cards? I use rtl cards myself
but people will tend to moan unless 3com is mentioned somewhere :P
* You used software block devices, I reckon there's a significant
performance issue there given the state of the loopback code (if that's
in fact what you meant you were/are using?)
Anyway, a good read, I like (not that my opinion matters much). I'll go
right through it later and see if I can add anything useful as I'm in the
process of setting up distributed filesystems in a new cluster at home in
Reading (the external facing side of which is apogee.jonmasters.org). At
the moment it's going to be running NFS automounted filesystems with
failover between machines and perhaps a distributed filesystem such as the
(now non-Free :-() GFS or somesuch, but I am interested in exporting block
devices and have played with this idea a little previously. I'm not sure
of the practicalities of using it for a resilient RAID setup/system
especially handling locking and recovering nodes and so forth - in fact I
worry about the reliability of the idea but it'd be interesting to test it
out and see what happens :-) The reason for going with NFS/NIS initially
is that I'm setting up a playpen of Solairs 8 boxen at home which shall be
joining the fun eventually...[0]
Matthew, you coming tomorrow night?
Jon.
[0] ...and yes I know I'm a Free software nut but I am acquiring a taste
for some of the features in the Solaris kernel that interest me.
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