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.

On Mon, Sep 27, 2021 at 7:13 AM Damien Le Moal
[off-list ref] wrote:

On 2021/09/26 22:57, Jingyun He wrote:

quoted

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.

quoted

Thanks.

--
Damien Le Moal
Western Digital Research