Very slow Fedora 22 installation

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Hi

I'm currently running a Fedora 22 kickstart install to one of our backup servers. Its been running for nearly a day now!

The root partition is on ext4 but there is a btrfs file system on top of md raid6 that holds our user backups. Each users' files are rsycned to the btrfs filesystem and then a snapshot made, so there are many thousands of snapshots.

Currently the install has been running for nearly a day (the main screen is full of dots). Behind the scenes the installer seems to be working its way through all the snapshots with messages like this in storage.log:

05:11:42,844 INFO blivet: hiding device existing 9.1 TiB btrfs snapshot home_xxx/20130423-000501 (59677) with existing btrfs filesystem
05:11:42,848 DEBUG blivet: existing RAID raid6 size == 9.1 TiB
05:11:42,852 DEBUG blivet: existing RAID raid6 size == 9.1 TiB
05:11:42,857 DEBUG blivet: BTRFSVolumeDevice.removeChild: kids: 32903 ; name: btrfs.133 ; 05:11:42,858 INFO blivet: removed btrfs snapshot home_xxx/20130423-000501 (id 59677) from device tree 05:11:42,858 DEBUG blivet: lvm filter: adding home_xxx/20130423-000501 to the reject list
05:11:43,540 DEBUG blivet: existing RAID raid6 size == 9.1 TiB

In my kickstart file I have a (legacy) line which I use to make sure that there is no possibility of the install happening to the wrong device:
ignoredisk --only-use=/dev/disk/by-id/ata-ST380815AS_9RA8ZRZK

where ata-ST380815AS_9RA8ZRZK is the disk I want to install the operating system to.

Is it possible that this is whats causing the slowness?

I guess I could remove the ignoredisk line now since I use the by-id name to identify the disk to install to in the 'part' commands. I think we introduced 'ignoredisk' ages ago when we had to specify partitions by names like /dev/hda1 and I was caught out once when the disks were enumerated in a different order in the installer than in the previous operating system I was using and the install happened to the wrong device.

I'm disinclined to interrupt the install at the moment, as it does seem to be making progress, but confirmation that removing the 'ignoredisk' line would avoid the issue I described would be useful.

Thanks

Roderick Johnstone

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