[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-users] Why is xen allocating entire disk/file?
On Jan 28, 2009, at 11:30 PM, Fajar A. Nugraha wrote: On Thu, Jan 29, 2009 at 12:20 PM, Charlie Reddington <charlie.reddington@xxxxxxxxx> wrote:# df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 446G 43G 381G 10% / tmpfs 3.9G 0 3.9G 0% /dev/shmRight here alone, has me kind of sketcy. Total - 446G - 43G should = 403GNo comment on that one :)But in var/lib/xen/images..... # du -sh * 9.8G ns1.img 9.8G ns2..img 119M shared01.img 20G www.img Doing the command as you say..... 9.8G -rwxrwxr-x 1 root root 9.8G Jan 28 15:18 ns1.img 9.8G -rwxrwxr-x 1 root root 9.8G Jan 28 15:18 ns2.img 134M -rwxrwxr-x 1 root root 98G Jan 28 15:18 shared01.img 20G -rwxrwxr-x 1 root root 20G Jan 28 15:18 www.imgSo it doesn't use 100G right away, right? Both "du -sh" and "ls -lash" (leftmost column) shows space actually used. It can be different from the right column if it's created as sparse file (in your case, "not to allocate the entire disk yet").I'm just overall kind of confused how this is working. I should in theory be able to over allocate a number of vm's, so that when I get close torunning out, I can just add more disk space as cash allows.Yes, it should work like that. Note however that using sparse file has the downside of : - lower I/O performance initially (i.e. only when it has to allocate disk space previously used) - there might be a condition when you run out of space (e.g. when all domU unexpectedly needs more space) which can lead to unpredictable result. Regards, Fajar Thanks for the reply. I'm just trying to get the most out of this stuff as we are not. We'll be adding a lot more storage in the future, but are working on getting things going. I just want everything to have the ability to expand as it needs, and we should have everything in place before running out of disk space is an issue. So, since it's calling the file 100gb, but only use 20, will I run into any problems on the host system thinking it's out of memory? That's really probably my only concern. If I setup 10vms and I'm over by a 100gb or so, will the host os complain? Thanks, Charlie _______________________________________________ Xen-users mailing list Xen-users@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-users
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