First approach: drbd in master master mode having two server shares everytime synced. Or (glusterd) glusterfs 3.1 having 1 to ....xxxx servers synced in realtime To setup simple failover with samba and drbd look here for a hint :[Samba] HOWTO samba4 centos5.5 named dnsupdate drbd simple failover
Good Luck daniel On Sat, 8 Jan 2011 12:05:23 +0800, David Roid <[email protected]> wrote: > I think what you really need is clusterd file system.. > > 2011/1/8 Emiliano Bonassi <[email protected]> > >> Hi, >> i'm Emiliano this is my first mail to samba mailing list. >> I have to solve this issue for a company. They need to had a folder, >> shared >> over CIFS for windows/mac clients, that is always available, also if the >> server who host it hang up or burn. >> I've looked for a lot of solution but i cannot find the right for me. >> Actually the company has two server, all running debian lenny as linux >> distro. >> The first one, a quad core proliant ml350 g5 6tb raid 10, work as primary >> server. On it i've installed vmware server that runs a win2003 r2 guest >> for >> central authentication,domain policing ecc. It has another role : the >> primary file server, running a samba server integrated with AD. >> The seconde one, a pentium 4 1,2 tb raid 5, work as secondary server. >> Like >> the proliant it has vmware server running a BDC w2k3 r2 for fail-over and >> load balancing windows services. Here the file sharing is offered again >> by >> a >> samba server that shares archive folders. >> Now, how can i have the same shared folder on both file servers? >> I can adopt microsoft technology : use DFS filesystem and FSR replicas. >> Actually, i'm fallen in love with the DFS functionality that permit to >> uniform the namespace of file servers resource using only the name of the >> ad >> domain, but i hate the limits of FSR replicas. >> Hyp: >> - Think that i use DFS and setup that \mydomain\dfs\aaa refer to >> \firstserver\aaa and \secondserver\aaa. >> - aaa on the firstserver and on the secondserver are the same >> - i've setup FSR replicas continuosly between the two shares. >> >> Now, if from one my win client i poll for \mydomain\dfs\aaa , using >> somekind >> of roundrobin\casual algorithm, the DC tell me that \mydomain\dfs\aaa is >> \firstserver\aaa or \secondserver\aaa. >> Suppose, that DC translate the dfs share with the share on the second >> file >> server, this means that if i open a file gino.txt i'm working on gino.txt >> on >> secondserver. >> So now, before the FSR replica, second server got a version of gino.txt >> newer than first server. >> Now there is a little window of time when if another client ask for the >> same >> dfs share and the same file, it could be possible that DC translate >> \mydomain\dfs\aaa with \firstserver\dfs\aaa and this second windows >> client >> works a different version of the file. >> Now imagine, that, always before the start of FSR replica, this second >> windows client save a modified version of gino.txt . >> The FSR algorithm take a decision, "i propagate the newer version of >> file". >> So DFS doesn't work for my situation, i think. >> >> So i ask to you if CTDB samba could work for my problem. >> I think no, because i have to have the same configuration (also shares, >> here >> is the problem, i need only one share) between the two fileservers. >> I'm trying to test this configuration: using LVM create a LV and mirror >> with >> drbd between two fileserver. >> After, put a GFS2 filesystem on them and sharing the filesystem as two >> separate shares on the two file servers. >> Now i think that DFS could work as a peacemaker to decide which host is >> up >> and translate DFS correctly. >> Suppose that i open gino.txt on \1st\aaa , modify it, and save it. If i >> setup drbd with the sync mode, instantanously, because the copy it's at >> the >> block level, i have the same file on \2nd\aaa. >> But if i open gino.txt on \1st\aaa and gino.txt \2nd\aaa , who tell to >> the >> two usesr that the same file is opened on both fileserver? >> From my test seems that only ctdb samba could provide a locking >> mechanism ( >> at the cifs level), but gfs2 doesn't provide nothing like that. >> >> My hope is that someone had the same issue and solved in some way, i know >> that it is long but it's also difficult to explain my doubts and >> willings. >> Thanks for the reply, >> Emiliano >> >> >> PS: I've looked for also GlusterFS but not tested, i'm scared that >> operating >> as FUSE there will be some performance break down. I will test, i wish. >> -- >> To unsubscribe from this list go to the following URL and read the >> instructions: https://lists.samba.org/mailman/options/samba >> -- To unsubscribe from this list go to the following URL and read the instructions: https://lists.samba.org/mailman/options/samba
