In Piston OpenStack we use config_drive_format=vfat to prevent data loss during instance block migrations (because libvirt does not block migrate virtual cdrom devices), but current cloudbase.it cloud-init release supports only iso9660 config drive format.
Do you have plans to add vfat support as well in the future?
Thanks in advance.
The issue is that the VFAT config drive is a so called RAW partition (e.g. on Linux you'd mount it directly as /dev/sdb, not /dev/sdb1) and this is not supported by Windows, where a partitioning scheme is required (e.g. MBR) in order to mount a partition.
What we can do is to extract the raw block data from the disk, put them in a vfd file and mount that as a loopback device (Windows 2008 R2 / Windows 7 and above). Being this a non trivial implementation we always left it as a low priority feature request due to the availability of the ISO option.
Note: the libvirt (KVM) live migration issue with config drives has been fixed in Juno: https://review.openstack.org/#/c/112014/
This bug fix is worth a backporting to Icehouse as well IMO.
I have some good news. Incidentally we're working on another project which involves VFAT images and it looks like I have a solution for this. Would you be interested in beta testing it?
Asked: 2014-10-23 03:21:17 +0200
Seen: 856 times
Last updated: Oct 23 '14
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