Hans Reiser wrote:
> Steve, there is a remark about XFS below which you are going to be
> more expert on.
>
> Theodore Ts'o wrote:
>
>>
>>XFS has similar issues where it assumes that hardware has powerfail
>>interrupts, and that the OS can use said powerfail interrupt to stop
>>DMA's in its tracks on an power failure, so that you don't have
>>garbage written to key filesystem data structures when the memory
>>starts suffering from the dropping voltage on the power bus faster
>>than the DMA engine or the disk drives. So XFS is a great filesystem
>>--- but you'd better be running it on a UPS, or on a system which has
>>power fail interrupts and an OS that knows what to do. Ext3, because
>>it does physical block journalling, does not suffer from this problem.
>>(Yes, Resierfs uses logical journalling as well, so it suffers from
>>the same problem.)
>>
True now, not so around 2.4.20 when XFS was rock-solid. I think they tried
to improve on performance and broke something. I wish they would fix that
because it forced me back to ext3, as in consistency over performance any
time.
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