[issue1586] HAMMER: you can mount_hammer a UFS that was a hammer fs before

[Bill Hacker]

Jan.Lentfer at web.de wrote:
Hi Bill,

but the fact is that you can mount the device as hammer fs and use it as 
hammer fs and as UFS AT THE SAME TIME, although you have "formatted" it 
as UFS. That should not be.

Cheers,

Jan

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What you call 'fact' is simply limited information as to what is going on.

'dd' a 'before' and 'after' copy of the first MB or so of it to some other media.

Go onto that media and diff those two files.

Take a hex editor to the area(s) of difference and see what is actually 
happening on-disk.

Likewise look into your logs and see what ~/all.log, ~/messages, ~/dmesg and 
~/console.log have to tell you.

DragonFlyBSD just might be a tad smarter than first meets the eye...

;-)