* NFS & Clustering @ 2002-09-04 8:35 Marco.Schwarz 2002-09-04 16:03 ` Bryan O'Sullivan 0 siblings, 1 reply; 8+ messages in thread From: Marco.Schwarz @ 2002-09-04 8:35 UTC (permalink / raw) To: NFS Hi all, we are looking into the possibility of building a clustered NFS-root server for our diskless clients. Does anybody know if this is possible with NFS and which cluster software is best for this task (OpenMOSIX ?). Thanks in advance, Marco ------------------------------------------------------- This sf.net email is sponsored by: OSDN - Tired of that same old cell phone? Get a new here for FREE! https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: NFS & Clustering @ 2002-09-04 16:03 ` Bryan O'Sullivan 2002-09-04 16:20 ` Ragnar Kjørstad 2002-09-04 16:24 ` Emanuel Quass 0 siblings, 2 replies; 8+ messages in thread From: Bryan O'Sullivan @ 2002-09-04 16:03 UTC (permalink / raw) To: Marco.Schwarz; +Cc: NFS On Wed, 2002-09-04 at 01:35, Marco.Schwarz@Freudenberg.de wrote: > we are looking into the possibility of building a clustered NFS-root server > for our diskless clients. Does anybody know if this is possible with NFS and > which cluster software is best for this task (OpenMOSIX ?). It isn't possible without a modified mountd that replicates mount information. I haven't seen any free NFS servers that do this, but I haven't looked very hard. <b ------------------------------------------------------- This sf.net email is sponsored by: OSDN - Tired of that same old cell phone? Get a new here for FREE! https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: NFS & Clustering 2002-09-04 16:03 ` Bryan O'Sullivan @ 2002-09-04 16:20 ` Ragnar Kjørstad 2002-09-04 16:22 ` Bryan O'Sullivan 2002-09-04 16:24 ` Emanuel Quass 1 sibling, 1 reply; 8+ messages in thread From: Ragnar Kjørstad @ 2002-09-04 16:20 UTC (permalink / raw) To: Bryan O'Sullivan; +Cc: Marco.Schwarz, NFS On Wed, Sep 04, 2002 at 09:03:46AM -0700, Bryan O'Sullivan wrote: > On Wed, 2002-09-04 at 01:35, Marco.Schwarz@Freudenberg.de wrote: > > we are looking into the possibility of building a clustered NFS-root = server > > for our diskless clients. Does anybody know if this is possible with = NFS and > > which cluster software is best for this task (OpenMOSIX ?). >=20 > It isn't possible without a modified mountd that replicates mount > information. I haven't seen any free NFS servers that do this, but I > haven't looked very hard. Sure it is. mountd writes the information to disk - you just need to share that info between the servers. --=20 Ragnar Kj=F8rstad ------------------------------------------------------- This sf.net email is sponsored by: OSDN - Tired of that same old cell phone? Get a new here for FREE! https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: NFS & Clustering 2002-09-04 16:20 ` Ragnar Kjørstad @ 2002-09-04 16:22 ` Bryan O'Sullivan 2002-09-04 16:25 ` Ragnar Kjørstad 0 siblings, 1 reply; 8+ messages in thread From: Bryan O'Sullivan @ 2002-09-04 16:22 UTC (permalink / raw) To: Ragnar Kjørstad; +Cc: Marco.Schwarz, NFS On Wed, 2002-09-04 at 09:20, Ragnar Kj=F8rstad wrote: > Sure it is. mountd writes the information to disk - you just need to > share that info between the servers. That leaves you with an obvious race condition. <b ------------------------------------------------------- This sf.net email is sponsored by: OSDN - Tired of that same old cell phone? Get a new here for FREE! https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: NFS & Clustering 2002-09-04 16:22 ` Bryan O'Sullivan @ 2002-09-04 16:25 ` Ragnar Kjørstad 0 siblings, 0 replies; 8+ messages in thread From: Ragnar Kjørstad @ 2002-09-04 16:25 UTC (permalink / raw) To: Bryan O'Sullivan; +Cc: Marco.Schwarz, NFS On Wed, Sep 04, 2002 at 09:22:40AM -0700, Bryan O'Sullivan wrote: > On Wed, 2002-09-04 at 09:20, Ragnar Kj=F8rstad wrote: >=20 > > Sure it is. mountd writes the information to disk - you just need to > > share that info between the servers. >=20 > That leaves you with an obvious race condition. For active/passive systems there are no race-conditions and it works fine. For active/active systems there would be a race, but it still wouldn't work because the data is (AFAIK) not reread from disk. --=20 Ragnar Kj=F8rstad ------------------------------------------------------- This sf.net email is sponsored by: OSDN - Tired of that same old cell phone? Get a new here for FREE! https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: NFS & Clustering 2002-09-04 16:03 ` Bryan O'Sullivan 2002-09-04 16:20 ` Ragnar Kjørstad @ 2002-09-04 16:24 ` Emanuel Quass 2002-09-04 16:40 ` Bryan O'Sullivan 1 sibling, 1 reply; 8+ messages in thread From: Emanuel Quass @ 2002-09-04 16:24 UTC (permalink / raw) To: Bryan O'Sullivan; +Cc: NFS Hi, but doesn't it work if you share /var/lib/nfs/* (containing etab, rmtab, = sm, =20 sm.bak, state, xtab)? MfG =09Emanuel Am Mittwoch, 4. September 2002 18:03 schrieb Bryan O'Sullivan: > On Wed, 2002-09-04 at 01:35, Marco.Schwarz@Freudenberg.de wrote: > > we are looking into the possibility of building a clustered NFS-root > > server for our diskless clients. Does anybody know if this is possibl= e > > with NFS and which cluster software is best for this task (OpenMOSIX = ?). > > It isn't possible without a modified mountd that replicates mount > information. I haven't seen any free NFS servers that do this, but I > haven't looked very hard. > > =09<b ------------------------------------------------------- This sf.net email is sponsored by: OSDN - Tired of that same old cell phone? Get a new here for FREE! https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: NFS & Clustering 2002-09-04 16:24 ` Emanuel Quass @ 2002-09-04 16:40 ` Bryan O'Sullivan 2002-09-04 16:53 ` Ragnar Kjørstad 0 siblings, 1 reply; 8+ messages in thread From: Bryan O'Sullivan @ 2002-09-04 16:40 UTC (permalink / raw) To: emanuel.quass; +Cc: NFS On Wed, 2002-09-04 at 09:24, Emanuel Quass wrote: > but doesn't it work if you share /var/lib/nfs/* (containing etab, rmtab, sm, > sm.bak, state, xtab)? Not reliably. You're left with a single point of failure, for one thing. You also have races between one server permitting a mount and others knowing that the mount has been allowed, which can confuse clients. <b ------------------------------------------------------- This sf.net email is sponsored by: OSDN - Tired of that same old cell phone? Get a new here for FREE! https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 8+ messages in thread
* Re: NFS & Clustering 2002-09-04 16:40 ` Bryan O'Sullivan @ 2002-09-04 16:53 ` Ragnar Kjørstad 0 siblings, 0 replies; 8+ messages in thread From: Ragnar Kjørstad @ 2002-09-04 16:53 UTC (permalink / raw) To: Bryan O'Sullivan; +Cc: emanuel.quass, NFS On Wed, Sep 04, 2002 at 09:40:08AM -0700, Bryan O'Sullivan wrote: > On Wed, 2002-09-04 at 09:24, Emanuel Quass wrote: >=20 > > but doesn't it work if you share /var/lib/nfs/* (containing etab, rmt= ab, sm, =20 > > sm.bak, state, xtab)? >=20 > Not reliably. You're left with a single point of failure, for one > thing. You also have races between one server permitting a mount and > others knowing that the mount has been allowed, which can confuse > clients. I suppose you're suggesting that the disk with /var/lib/nfs/ is a single point of failure? Well yes, unless you use a redundant storage-system. The race-condition is only present when the nfs-service is enabled on both server at the same time. For active/passive failover you have software that monitor the health of the the primary-system and the secondary system is only started up if the primary fails. So, there is no race. --=20 Ragnar Kj=F8rstad ------------------------------------------------------- This sf.net email is sponsored by: OSDN - Tired of that same old cell phone? Get a new here for FREE! https://www.inphonic.com/r.asp?r=sourceforge1&refcode1=vs3390 _______________________________________________ NFS maillist - NFS@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/nfs ^ permalink raw reply [flat|nested] 8+ messages in thread
end of thread, other threads:[~2002-09-04 16:53 UTC | newest] Thread overview: 8+ messages (download: mbox.gz follow: Atom feed -- links below jump to the message on this page -- 2002-09-04 8:35 NFS & Clustering Marco.Schwarz 2002-09-04 16:03 ` Bryan O'Sullivan 2002-09-04 16:20 ` Ragnar Kjørstad 2002-09-04 16:22 ` Bryan O'Sullivan 2002-09-04 16:25 ` Ragnar Kjørstad 2002-09-04 16:24 ` Emanuel Quass 2002-09-04 16:40 ` Bryan O'Sullivan 2002-09-04 16:53 ` Ragnar Kjørstad
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