(Illustration by Gaich Muramatsu)
A friend of mine and I have now spent many hours scattered through the past few weeks playing with coda, first 4.6.6, then 5.0.0, so hopefully I can contribute a bit from the viewpoint of an outsider to the project. First off, I have to say that I am quite impressed. While coda has plenty of rough spots, it has an amazing amount of functionality. The free software community has needed a real alternative to NFS for a long time, and THIS IS IT! I really want to get my research group using coda, and I believe it is almost ready for that. So, I'm happy to be one of the guinea pigs. :-) Now to more concrete concerns. First, to point out where I'm coming from, here's what we've been playing with. I've been building coda from scratch on Debian 2.0/2.1 systems, and I've installed coda on a FreeBSD 2.2.6 box using the precompiled binaries. (I've heard about Debian packages, but I haven't found them - of course, I haven't looked that hard. Are they around?) So, here are some issues I've had: * The source distribution has hardly any documentation! There is no generic readme file, and there are no copies of the INSTALL.<platform> files (which have been very helpful to me, thank you!). I've downloaded the separate docs package, and that has caused me a great amount of grief, even after patching the sgml-tools source (I only had 1.0.9 around, not 1.0.7, and even though the patch applied cleanly, the html build process was still somewhat broken.) It would be wonderful if there was a precompiled docs bundle - sometimes it isn't convenient to continuously browse the web from home, especially when someone else needs the phone. :-) * I don't quite grok replicated servers, especially the parts having to do with the root volume. From the howto, here is what is says to do after setting up a non-SCM server: 1. Your server needs a server number, to be added to the /vice/db/servers file ON THE SCM. 2. Make two new entries in the /vice/db/VSGDB file. One for your new server by itself, one of the form: E0000104 scm-server second-server. 3. Start updatesrv and updateclnt on the second server. 4. Start codasrv on the second server 5. Make a new volume from the SCM using createvol_rep giving the address of the volume as E0000104. 6. Mount the volume as above. #2 is not very clear to me - what should the line for the new server look like? Maybe an example would help. Should my VSGDB look like: E0000100 scm-server E0000100 second-server E0000104 scm-server second-server or E0000100 scm-server E0000101 second-server E0000104 scm-server second-server or E0000100 scm-server second-server E0000104 scm-server second-server ? What I really want to do is have a read-write replicated root. Is this currently impossible? Or does it happen automatically? Even though I've played with this a bit, I'm not sure. I can create and use a separate replicated volume (by using the second of the above alternatives), but a) the replication is quite fragile, and b) the root does not appear replicated (which is what I expected). Do I have to create a read-only replicant of my root partition, and install that on the replicated servers? I think I'm missing some basic concepts here. * Can you start venus without it referring to all replicated servers of a given volume? Originally, I had a client that was only talking to the SCM. Then, I added a second server, and created a replicated volume. I could mount and unmount this volume on the SCM client, but I couldn't access it! When I reinstalled the client using both the scm-server and second-server, then I could mount and access the replicated volume. The behavior was flaky (after overflowing the local cache, we had to do some reboots, and still things were weird), but it basically worked. So - does venus need to know about ALL servers in the cell when it starts up? * Does a client's cache have to be big enough to hold any single file? Or does it have to be big enough to hold a whole directory? We definitely had problems when we tried copying a 23M file into coda when the client only was set up with a 20M cache. I think that's it for now. I don't know if I'll be able to contribute code patches for a while, but I'm pretty sure I can do bug reports once I'm up and running. Thanks! --Anil -- Anil Somayaji (soma_at_cs.unm.edu) http://www.cs.unm.edu/~soma +1 505 872 3150Received on 1999-01-19 15:49:40