(Illustration by Gaich Muramatsu)
(Illustration by Gaich Muramatsu)
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <title></title> </head> <body> Jan Harkes wrote:<br> <blockquote type="cite" cite="mid:20011213223349.GA1417_at_cs.cmu.edu"> <pre wrap="">On Thu, Dec 13, 2001 at 10:23:40AM -0800, David J. M. Karlsen wrote:<br></pre> <blockquote type="cite"> <pre wrap="">I'm looking into coda to use it for a cluster of minimum two machines. <br>The replication seems to be fine - so I shouldn't loose any data. But as <br>it's only possible to have one SCM - I wonder what happens if the SCM <br>dies (for good that is - let's say the drives fails due to HW trouble) - <br>will the other non-SCM server with the replica still feed all clients - <br>and all activity goes ahead undisturbed?<br></pre> </blockquote> <pre wrap=""><!----><br>If the SCM dies the only thing that is hindered is adding new<br>users/changing passwords and the creation of new volumes.</pre> </blockquote> they can still authenticate as well? (eg. use clog?) <blockquote type="cite" cite="mid:20011213223349.GA1417_at_cs.cmu.edu"> <pre wrap="">It is trivially to select one of the other server as the new SCM. All<br>required data is already replicated, you just need to tell every server<br>who the new SCM is<br> ( echo 'newscmhostname' > /vice/db/scm ;<br> /etc/rc.d/init.d/update.init restart )</pre> </blockquote> <br> <blockquote type="cite" cite="mid:20011213223349.GA1417_at_cs.cmu.edu"> <pre wrap="">Regular Coda clients accessing the system are not disturbed at all.<br></pre> </blockquote> <br> nice! I'm really hungy for this scheme now :)<br> <br> Some things abount the README at the ftp site:<br> first: it's for version 4.6.1 - should't it just be removed?<br> <br> also:<br> it referres to a venus-setup script that does not exist.<br> it tells me to run createvol_rep after running vice-setup.<br> Is this wrong? Beacuse when I first went into /coda/<myvol> the <myvol> existed. I ran createvol_rep - and now it's not there anymore... Doesn't the vice-setup do the createvol_rep as well?<br> <br> second: the README says that the LOG has to be large - isn't this wrong? The RVM needs to be large - the LOG doesn't?<br> <br> <br> Else:<br> codasrv uses and awfaul amount of mem - (eg. equal to the size of RVM).<br> I thougth it just did this when using files for LOG/RVM (beacuse they are mmap'ed) - but when I switched over to using partitions - it uses the same amount anway - is there a way to awoid this - the testmachine has only got 64 megs.<br> <br> (Does this have anyting to do with the privatemap=0/1 in the /etc/coda/server.conf?)<br> <br> <blockquote type="cite" cite="mid:20011213223349.GA1417_at_cs.cmu.edu"></blockquote> <pre class="moz-signature" cols="$mailwrapcol">-- <br>David J. M. Karlsen<br>http://www.davidkarlsen.com<br>+47 90 68 22 43</pre> <br> </body> </html>Received on 2001-12-13 17:43:27