Dne 6.5.2015 v 19:45 Locane napsal(a):
Hello, I apologize in advance for asking this question, but I can't seem to find the information in documentation or anything online. Short explanation: - I have a CentOS 6.6 LiveCD that is dying after lots of file system thrash - I use "dmsetup status" to check on when it's dying - I don't know what the numbers in "dmsetup status" represent - they're not labeled Can anyone answer this question <http://superuser.com/questions/900783/dmsetup-status-fields-explained> or label the following fields for me and explain what they are? [root@localhost ~]# dmsetup status live-osimg-min: 0 4194304 snapshot 1272/1272 16 live-rw: 0 4194304 snapshot 7568/1048576 40 What are the <number>/<number>s? What is the 2 digit number following them? My LiveCD dies when the 7568 number in this example gets to the (I assume gibabyte) 1048576 number. Can I increase this base size? I apologize again for asking such a rudimentary question on this mailing list, but I am desperate.
I'd say your snapshot volume 'live-osimg-min' has got out of space - and as such it has been already invalidated (data are LOST).
The snapshot has 'reserved' space for COW blocks - when this space is exhausted, snapshot is lost as it cannot hold any more exception blocks.
Normally you could run 'dmeventd' and monitor 'free' space in snapshot and let the tool to resize snapshot to add more space, but in your case it's already too late.
Also I'd recommend to learn how to use 'lvm2' commands before you start to play with low level dmsetup commands.
And to satisfy your curiosity about what those numbers means - here is the full description:
https://www.kernel.org/doc/Documentation/device-mapper/snapshot.txt Regards Zdenek -- dm-devel mailing list dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
