Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 2017-08-25 03:37 PM, Gionatan Danti wrote: > Il 25-08-2017 14:34 Digimer ha scritto: >> >> Our Anvil! project (https://www.alteeve.com/w/Build_an_m2_Anvil!) is >> basically this, except we put the VMs on clustered LVs and use gfs2 to >> store install media and the server XML files. >> >> I would NOT put the image files on gfs2, as the distributed locking >> overhead would hurt performance a fair bit. > > Hi, I contemplated using an active/active lvm-based configuration, but I > would really like to use files as per VM disks. > So, do you feel GFS2 would be inadequate for VM disk storage? What if a > node crashes/reboots? Will GFS2 continue to work? > > Thanks. The overhead of clustered locking is likely such that your VM performance would not be good, I think. With raw clustered LVs backing the servers, you don't need cluster locking on a per-IO basis, only on LV create/change/delete. Because LVM is sitting on top of DRBD (in dual-primary), live-migration is no trouble at all and performance is good, too. GFS2, being a cluster FS, will work fine if a node is lost, provided it is fenced succesfully. It's wouldn't be much of a cluster-FS otherwise. :) -- Digimer Papers and Projects: https://alteeve.com/w/ "I am, somehow, less interested in the weight and convolutions of Einstein’s brain than in the near certainty that people of equal talent have lived and died in cotton fields and sweatshops." - Stephen Jay Gould