Re: [ceph-users] Use trimfs on already mounted RBD image
Ok, thanks for Your reply. 2018-04-05 8:15 GMT+02:00 Wido den Hollander : > > > On 04/04/2018 07:30 PM, Damian Dabrowski wrote: > > Hello, > > > > I wonder if it is any way to run `trimfs` on rbd image which is > > currently used by the KVM process? (when I don't have access to VM) > > > > I know that I can do this by qemu-guest-agent but not all VMs have it > > installed. > > > > I can't use rbdmap too, because most images don't have distributed > > filesystems. It's mostly ext4/xfs so I can't mount them in two places at > > same time. > > > > I would be grateful for any help. > > > > No, you can not. If you map and mount a filesystem twice you will > corrupt the data on there. > > Same goes when you are going to fstrim, you will probably break/corrupt > data on the system. > > Do not attempt it. Shut down the VM and then do the fstrim. > > Wido > > > > > ___ > > ceph-users mailing list > > ceph-users@lists.ceph.com > > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > > > ___ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
Re: [ceph-users] Use trimfs on already mounted RBD image
On 04/04/2018 07:30 PM, Damian Dabrowski wrote: > Hello, > > I wonder if it is any way to run `trimfs` on rbd image which is > currently used by the KVM process? (when I don't have access to VM) > > I know that I can do this by qemu-guest-agent but not all VMs have it > installed. > > I can't use rbdmap too, because most images don't have distributed > filesystems. It's mostly ext4/xfs so I can't mount them in two places at > same time. > > I would be grateful for any help. > No, you can not. If you map and mount a filesystem twice you will corrupt the data on there. Same goes when you are going to fstrim, you will probably break/corrupt data on the system. Do not attempt it. Shut down the VM and then do the fstrim. Wido > > ___ > ceph-users mailing list > ceph-users@lists.ceph.com > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com > ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
[ceph-users] Use trimfs on already mounted RBD image
Hello, I wonder if it is any way to run `trimfs` on rbd image which is currently used by the KVM process? (when I don't have access to VM) I know that I can do this by qemu-guest-agent but not all VMs have it installed. I can't use rbdmap too, because most images don't have distributed filesystems. It's mostly ext4/xfs so I can't mount them in two places at same time. I would be grateful for any help. ___ ceph-users mailing list ceph-users@lists.ceph.com http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com