On Thu, Sep 2, 2010 at 1:10 PM, Jangita <jang...@jangita.com> wrote: > Hi Guys, > We have a system that has been running along nicely for the past three > months on a pc (4gb 1,8ghz,debian lenny pc). It is a telecom-financal > system; slightly 2 hits per minute but growing exponentally as customers > increase. >
Growth should be linear to the growth of customers, no ? :-) > We have now bought two servers 12Gb RAM RAID blah blah; RAID setup is important :-) Datafiles preferably on raid 10. > and we want to set the servers up such that one is an exact duplicate of > the other; to guard against hardware failiure (in case for example one > motherboard is fried for some reason). We want to be able to switch from one > server to the next and continue with minimum downtime. Switching will be > manual until I figure out how to do an automatic switch (probably > continuously ping the main server from the hot backup and if the ping fails > the hot backup can change its ip automatically or something!) > Have a look at Ultramonkey for that. > Anyway, what method of keeping the two servers in sync would the experts > recommend between replication and setting up a cluster (or something else)? > which will also give me a painless (and later maybe automatic) changeover? > Both servers are connected to the same switch. > Standard setup would be replication, yes. If you setup automatic failover, make sure you prevent automatic failback - that's the best way to mess up your dataset. I also hear MMM is pretty good, although I have no personal experience with it. Another route you might want to investigate, is Xen (or VMWare, if so inclined). Build a single virtual host on your hardware, allocate everything and the kitchen sink to it, and run your MySQL in it. You'll have a slight performance loss, obviously, but here's the benefit: you can set up the second server so that it keeps a bit-perfect copy of your primary machine. The moment your primary machine dies, the second takes over; and since it has the EXACT same state down to the last bit of ram, you don't even lose a ping. Under Xen this feature is called Remus I believe, VMWare calls it Live Migration or something similar. > -- > Jangita | +256 76 91 8383 | Y! & MSN: jang...@yahoo.com > Skype: jangita | GTalk: jangita.nyag...@gmail.com > > -- > MySQL General Mailing List > For list archives: http://lists.mysql.com/mysql > To unsubscribe: http://lists.mysql.com/mysql?unsub=vegiv...@tuxera.be > > -- Bier met grenadyn Is als mosterd by den wyn Sy die't drinkt, is eene kwezel Hy die't drinkt, is ras een ezel
