I am interested to see if it is ok to build up a global clustered storage across different IDCs with single naming space. That mean the Gluster servers are located in different IDCs. Next week I organize more detailed info of test environment and send you. Thanks again your reply. This project is pretty good and we are happy to continue testing on it. -----Original Message----- From: krishna.srinivas@xxxxxxxxx [mailto:krishna.srinivas@xxxxxxxxx] On Behalf Of Krishna Srinivas Sent: Friday, November 16, 2007 5:24 PM To: Felix Chu Cc: gluster-devel@xxxxxxxxxx Subject: Re: about Qluster FS configuration Felix, sometimes touch does not open() so a better way would be "od -N1" command. Regarding your setup, can you give more details? how would glusterfs be setup across 20 data centers? what would the speed be between them? Krishna On Nov 16, 2007 2:38 PM, Felix Chu <felixchu@xxxxxxxxxxxxxxxxxxxx> wrote: > Hi Krishna, > > Thanks your quick reply. > > About self heal, is that mean before the event open() triggered, the whole > replication cluster will have one less replica than normal state? If our > goal is to make the replication status back to normal(same #of replicas as > normal), we need to trigger open() for all files store in the cluster file > system, right? If so, the easiest way is to "touch *" in the clustered mount > point, right? > > By the way, we will setup a testing environment to create a GlusterFS across > 20 data centres, each data centre has point to point fiber in between. The > longest distance between two data centres is about 1000km. Do you think > GlusterFS can be applied in this kind of environment? Any minimum network > quality between storage servers and clients? > > Regards, > Felix > > > -----Original Message----- > From: krishna.zresearch@xxxxxxxxx [mailto:krishna.zresearch@xxxxxxxxx] On > Behalf Of Krishna Srinivas > Sent: Friday, November 16, 2007 4:19 PM > To: Felix Chu > Cc: gluster-devel@xxxxxxxxxx > Subject: Re: about Qluster FS configuration > > On Nov 16, 2007 1:18 PM, Felix Chu <felixchu@xxxxxxxxxxxxxxxxxxxx> wrote: > > Hi all, > > > > > > > > I am new user to this QlusterFS project. I just started the test in local > > environment with 3 server nodes and 2 client nodes. > > > > > > > > So far, it works fine and now I have two questions: > > > > > > > > 1. I cannot understand the option related to "namespace" clearly. I > > find that in most of the server conf files separated "DS" and "NS" > volumes, > > what is the purpose of it? > > > > namespace is used : > * to assign inode numbers > * to readdir(), instead of reading contents of all the subvols, unify > readdir()s just from NS. > > > > > > > e.g. in > > > http://www.gluster.org/docs/index.php/GlusterFS_High_Availability_Storage_wi > > th_GlusterFS > > > > > > > > there are "ds" and "ns" volumes in this config > > > > volume mailspool-ds > > > > type storage/posix > > > > option directory /home/export/mailspool > > > > end-volume > > > > > > > > volume mailspool-ns > > > > type storage/posix > > > > option directory /home/export/mailspool-ns > > > > end-volume > > > > > > > > 2. In my testing environment, I applied the replication function to > > replicate from one server to other 2 servers. Then I unplug one of the > > server. On client side it still ok to access the mount point. After a > > period, I up the unplugged server again and find that all data during the > > outage period does not appear on this server. Any steps required to sync > > data back to new recovered server? > > > > You need to open() that file to trigger selfheal for that file. > > Krishna > > > > > > _______________________________________________ > Gluster-devel mailing list > Gluster-devel@xxxxxxxxxx > http://lists.nongnu.org/mailman/listinfo/gluster-devel >
