Re: seagate hm-smr issue

[Jingyun He <jingyun.ho@gmail.com>]

Hello,
Do you have any update on this? or any patch that I can try?

Thanks.

On Mon, Sep 27, 2021 at 8:07 AM Damien Le Moal
<damien.lemoal@opensource.wdc.com> wrote:
>
> On 2021/09/27 8:42, Jingyun He wrote:
> > Hi,
> > You are correct, for a WD/HGST HM-SMR disk, it takes about 15 mins to
> > mount a full disk.
> >
> > But It takes about 2-3 hours for mounting a Seagate HM-SMR disk.
> >
> > Have no idea why Seagate takes so loooooong time.
>
> This is most likely due to a difference in the execution time of report zones
> commands.
>
> In any case, this will be resolved soon as we can cache a full disk zone report
> during the mount operation to avoid this slow per-zone report operation.
>
> >
> > On Mon, Sep 27, 2021 at 7:13 AM Damien Le Moal
> > <damien.lemoal@opensource.wdc.com> wrote:
> >>
> >> On 2021/09/26 22:57, Jingyun He wrote:
> >>> Hello,
> >>> Btrfs works very well on WD/HGST disks, we got some Seagate HM-SMR
> >>> disks recently,  model number is ST14000NM0428,
> >>> mkfs.btrfs works fine, and I can mount it, and push data into disk.
> >>> once we used up the capacity, and umount it. then we are unable to
> >>> re-mount it again.
> >>> The mount process will never end, the process just hangs there.
> >>>
> >>> Anybody can help me with this?
> >>
> >> +Naohiro and Johannes
> >>
> >> This is not a hang. Mount will just take a looooong time due to an inefficiency
> >> in how block groups are checked: a single zone report zone command is issued per
> >> block group, so with a disk almost full, that takes a long time (75000+zones
> >> checked one by one). Naohiro is working on a fix for this.
> >>
> >>>
> >>> Thanks.
> >>>
> >>
> >>
> >> --
> >> Damien Le Moal
> >> Western Digital Research
>
>
> --
> Damien Le Moal
> Western Digital Research