Den tis 4 dec. 2018 kl 10:37 skrev linghucongsong <linghucongsong@xxxxxxx>: > Thank you for reply! > But it is just in case suddenly power off for all the hosts! > So the best way for this it is to have the snapshot on the import vms or have to mirror the > images to other ceph cluster? Best way is probably to do just like you would handle power outages for physical machines, make sure you have working backups with tested restores, AND/OR scripts that can reinstall your guests again if needed and then avoid power outages as much as possible. ceph will only know that certain writes and reads are being made from the openstack compute hosts, it will not know the meaning of an individual write, so it can't know if one write just before an outage is half of an xfs update needed to create a new file or if it is a complete transaction, so if you remove the storage at random, then random errors will occur on your filesystem, just like pulling out a USB stick while you are writing to it. If power outages are very common, you might consider having lots of small filesystems on your guests and mount them readonly as much as possible, and then for short intervals have them readwrite-able so that the chance for each partition getting broken during outages gets as small as possible. >> HI all! >> >> I have a ceph test envirment use ceph with openstack. There are some vms run on the openstack. It is just a test envirment. >> my ceph version is 12.2.4. Last day I reboot all the ceph hosts before this I do not shutdown the vms on the openstack. >> When all the hosts boot up and the ceph become healthy. I found all the vms can not start up. All the vms have the >> below xfs error. Even I use xfs_repair also can not repair this problem . >> > > So you removed the underlying storage while the machines were running. What did you expect would happen? > If you do this to a physical machine, or guests running with some other kind of remote storage like iscsi, what > do you think will happen to running machines in that case? > > > -- > May the most significant bit of your life be positive. > > > > -- May the most significant bit of your life be positive. _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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