Re: [PATCH] blk-mq: fix corruption with direct issue

Guenter Roeck
2018-12-05T19:09:53Z

On Wed, Dec 05, 2018 at 10:59:21AM -0700, Jens Axboe wrote:
[ ... ]
>
> > Also, it seems to me that even with this problem fixed, blk-mq may not
> > be ready for primetime after all. With that in mind, maybe commit
> > d5038a13eca72 ("scsi: core: switch to scsi-mq by default") was a
> > bit premature. Should that be reverted ?
>
> I have to strongly disagree with that, the timing is just unfortunate.
> There are literally millions of machines running blk-mq/scsi-mq, and
> this is the only hickup we've had. So I want to put this one to rest
> once and for all, there's absolutely no reason not to continue with
> what we've planned.
>

Guess we have to agree to disagree. In my opinion, for infrastructure as
critical as this, a single hickup is one hickup too many. Not that I would
describe this as hickup in the first place; I would describe it as major
disaster. I also don't think the timing is unfortunate. If anything,
it proves my point.

Thanks,
Guenter