> How is an internal snapshot defined? I'm not completely sure. Ask hannken@.
> The term seems to only exist in dump(8). And fsck_ffs(8). > Is it a snapshot for which the backing store is on the same disk > the snapshot is done? I suppose. hannken@ should know. My experience is that I regularily take external snapshots (using fssconfig(8)) while doing TSM backups, and this works fine even for multi-TB filesystems. However, taking an internal snapshot (fsck -X) on that filesystem starved the machine, eventually paniced it (some WAPBL resource exhaustion) and the log replay on reboot took something like half an hour. On much smaller filesystems, fsck -X works fine.
