(Illustration by Gaich Muramatsu)
Hi folks, this is my first mail to this list!!!! So this might be quiet long, but PLEASE read it because it contains lot's of infos, some question and an opportunity to have a huge fileserver test candidate! I work in a research lab, and my decided that it would be really cool if we would use coda as a fileserver. He gave me the job of preparing everything and install it and make the setup. First of all let me explain the specs of the system: It is a PIII500 Mhz (can add a second one), with only 128MB for the moment ( 3slots free) and 8 (yes eight!!!!!) 20GB IDE Harddisk connected with Ultra66 controllers (1 hd/bus). The system will be running linux. We basically had the follwing setup in mind: Put /boot on every hd. Use Raid-1 for the rest of the linux stuff (minimal config) on all 8 disks. And use the rest for coda by RAID-5'ing the remaining space (~138GB - Swap). Now I have done some background checking on coda and found out that it does not scale that well. Especially there seems to be this hard limit of 1GB of RVM, which results in 25GB data space, if you count 4% as mentioned in the HOWTO. Now this is largely below our expectations, but we are not yet giving up the idea of coda, that's why I am writing here. I would like to know what you guys think to do best with that machine and coda!!!!!! I have already thought about a second setup which is based on the size-restrictions of coda and an e-mail in the archives which said sth about multiple servers on one machine: Just RAID-5 (or 1) the linux part. Then use one server for each remaining harddisk (6 or 7). Each of the server would like that have 20GB of space - RVM - Log. Like this we could use the replication capability of coda to replace our 'RAID-5 over the coda'! This would be of no help if the machine crashes, but if a harddisk fails it would have the same effect as RAID-5 (even bether, depending on the volume replication used). Several server would also give us more freedom to play around with the capabilities of coda! The problem now is, that I can't judge how resource hungry coda gonna be, and how many servers I can put on a machine with 1 (or 2) PIII 500!!!! This immediatly leads me to another question (actually two): In the howto on page 13 (about the fileserv config), there is mentioned that the servermachine needs virtual memory the size of RVM + 6MB(server) +other soft!!!!! Does this now mean that for my linux server I need swap space equal to that size minus the real memory I have??? Or does this restriction apply to the address capability of my OS and the machine???? The other question concerns an e-mail to this list from Jan (jaharkes_at_cs.cmu.edu), the 17th of october, concerning 'largest coda server size' where he writes that: "The real limit largely depends on the amount of real memory vs swap space in the machine!!!" Could anybody try to give me some more information about this Real memory vs swap space issue. So that I could find out how much real memory and swap I will need per server of 20GB and as a result how much of it on the machine!!!!!! I think that's it for the moment. I am sorry for the length of the mail, and hope somebody gonna read through it! If something is not clear from the above explications, don't hesitate to drop me an e-mail. thank you all very much in advance remo PS Is the above mentioned system of any interest for the coda group??? (Found this mail in the archive about coda and bazaar and needing testers for large servers...dating from January) PSII: Tried to subscribe to the mailing list today, but never got any confirmation. So I don't know whether it is just slow, or I have done sth wrong. Anyway please reply directly to me. (At least as well as to the list in case I did not suceed to subscribe)Received on 1999-10-28 16:47:43