On 19/11/13 18:56, Robert van Leeuwen wrote:
Hi,
Since the /dev/sdX device location could shuffle things up (and that would mess
things up) I'd like to use a more-persistent device path.
Since I'd like to be able to replace a disk without adjusting anything (e.g.
just formatting the disk) the /dev/disk/by-path seems the best fit.
However, this device has colons in the name and ceph-deploy uses this as
separators so that won't work.
Also, I'm interested to what ceph (deploy) uses to decide which disks should be
mounted @ boot.
I do not see any fstab entries but disks do get mounted.
It looks like it is just using /dev/sdX for this instead of the /dev/disk/by-id
/by-path given by ceph-deploy.
So I am wondering how other people are setting up machines and how things work
:)
The auto mount stuff is handled by installed udev scripts that come with
the ceph package installation (usually installed in (/lib/udev/rules.d)
- see the udev dir in the src.
This should mean you can just use ceph-deploy and say 'make me an osd on
/dev/sdx' and it will make a symlink /var/lib/ceph/osd/ceph-n that
points to (one, often this 1st) partition on /dev/sdx.
No doubt other schemes are possible, but this seems to be quite ok to me!
Cheers
Mark
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