[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Re: Xen + SAN
Am 24.06.2011 um 07:52 schrieb Javier Guerra Giraldez: > On Fri, Jun 24, 2011 at 12:25 AM, Christian Motschke > <christian@xxxxxxxxxxx> wrote: >> CLVM is not a pain. You only need cLVM if you follow some rules. IO fencing, >> pacemaker and all this complicated stuff is not really needed. Only cLVM >> compiled with openais. You can even make snapshots in a cluster environment >> with the latest version of LVM2. I use this since 3 years now and never lost >> a machine. > > totally agree on openais. unfortunately, last time i checked, it > wasn't always easy to install on all distros. redhat ones are (were?) > specially set on the old GFS ways. in the end, it's all mostly a > design problem; but you _do_ have to have all concepts very well > defined. > > didn't know about snapshots working at last! great news certainly. > how recent is that? is it available out of the box on any distro? or > do you have to compile all yourself? > I made my own packages from the latest sources for debian. Clustered snapshots should work since january (2.0.2.84). I had some problems with it, but got it running yesterday with the latest sources of LVM2 ;-). > >> 3: do all the LVM management on the target(s), export each LV as an >> iSCSI LUN. Most commercial iSCSI appliances include management on par >> with LVM, at the very least. >> >> This is a pain, when you have more then 100 machines, as I have. > > care to expand? i've never really used any commercial iSCSI box, just > checked that they do comply with all checkpoints, and fooled a little > on some control screens. AFAICT, there's usually some (maybe > optional, maybe expensive) global manager console that let's you > control many boxes on the same screen. I mean, when you add or remove a new LV (iSCSI LUN) you have to do it with a graphical management console, set the access rights for the hosts etc. for every LUN. It is easier and faster to use lvcreate on one host. > > or do you mean that it's a pain when you have many Linux-based storage > boxes? if so, i have to agree. it's simple only when you have a > handful of targets. after a point, you definitely need something > else. can be cLVM, or glusterFS, or maybe just some clever > scripts+frontend. > > > -- > Javier > > _______________________________________________ > Xen-users mailing list > Xen-users@xxxxxxxxxxxxxxxxxxx > http://lists.xensource.com/xen-users _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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