On 8/27/05, brianu <brianu@xxxxxxxxxxxxxx> wrote: > > > > Hello all, > > > > This is a question I have basically been asking, the question on why you > would want to do it is failover, the docs at > http://sourceware.org/cluster/gnbd/gnbd_usage.txt state > that dm-multipath is an option for gnbd, and documents elsewhere also > indicate that GNBD can be configured as a redundancy, yet I cannot find any > documentation on how to configure it. > > > > If using LVM to make a volume of imported gnbds is not the answer for > redundancy can anyone suggest a method that is? Im not opposed to using any > other resource of cluster or GFS but I would really like to implement a > redundant solution, ( gnbd, gulm, etc.). > Hi, Brianu, maybe LVM + md + gnbd should be one of the solution for redundancy, for example, you have 2 gnbd servers, each one exports 1 disk. Then, the steps should be: 1. create a RAID-1 /dev/md0 on GFS client with imported 2 gnbd block devices. 2. use LVM create /dev/vg0 on top of them. 3. mkfs_gfs on /dev/vg0. I haven't tried this configuration, theoretically, it should work. Thanks, Michael > > > > > Does anyone has an example of a redundant solution for a cluster/gfs > filesystem i.e ( gnbd, gulm etc) ? > > > > Regards, > > > > Brian > > > > Message: 9 > > Date: Fri, 26 Aug 2005 16:33:51 +0700 > > From: "Fajar A. Nugraha" <fajar@xxxxxxxxxxxx> > > Subject: Re: Re: If I have 5 GNBD server? > > To: linux clustering <linux-cluster@xxxxxxxxxx> > > Message-ID: <430EE1FF.6050505@xxxxxxxxxxxx> > > Content-Type: text/plain; charset=ISO-8859-1; format=flowed > > > > Michael wrote: > > > > >Can anyone answer my question? > > > > > > > > > > > I don't think LVM cares what kind of storage it uses, as long as it's a > > block device. > > So theoretically, you can mix local disc, FC storage, GNBD, and ATOE and > > combine them using LVM. You might run into performance issues (GNBD are > > slower than FC disks) and startup issues (LVM has to start after cluster > > and gnbd-import successfuly start), but it should be possible. > > > > The real question is WHY you want to do that. > > AFAIK, if you combine 5 gnbd from 5 gnbd servers into one LVM, and you > > are accessing a volume on that volume group, and one of the gnbd server > > dies (or hangs), gnbd import will wait forever until that server is back > > up. So you'll have five more single-point-of-failures. > > > > Regards, > > > > Fajar > > > > >On 8/26/05, Michael <mikore.li@xxxxxxxxx> wrote: > > > > > > > > >>Hi, > > >> > > >>If I have 5 gnbd servers in the network, each one export 1 block > > >>device, can I import all gnbd devices on each gfs client, and use lvm > > >>to manage them as 1 shared pool, then mkfs_gfs on it? > > >> > > >>Thanks, > > >> > > >>Michael > > >> > > >> > > >> > > > > > > > > > > > > > > > > > Brian Urrutia > > System Administrator > > Price Communications Inc. > > There are 10 types of people in this world, > those who understand binary and those who don't. > > > > -- > > Linux-cluster@xxxxxxxxxx > http://www.redhat.com/mailman/listinfo/linux-cluster > > -- Linux-cluster@xxxxxxxxxx http://www.redhat.com/mailman/listinfo/linux-cluster
