* Problem with initial sync of a RAID1 with 4Kn drives
@ 2021-01-29 20:31 Tobias Jakobi
0 siblings, 0 replies; only message in thread
From: Tobias Jakobi @ 2021-01-29 20:31 UTC (permalink / raw)
I recently got two new Seagate drives, Seagate Exos X X16, which are
able to switch into native 4K mode. I used the Seagate tools to trigger
the switch, and now want to use the two drives in a RAID1.
I proceeded to create the md device:
mdadm --create --verbose --level=1 --metadata=1.2 --raid-devices=2
/dev/md/onyx-new /dev/sda /dev/sdb
As soon as the initial sync starts the kernel log begins to fill up with
errors. Here's part of the kernel log:
This is a 5.10.11 vanilla kernel, but it also happens with the 5.9.y
series. As you can see I already patched the kernel to include
DEBUG: 40801 1 7
This is just a simple print() in sd_setup_read_write_cmnd().
printk("DEBUG: %x %x %x\n", blk_rq_pos(rq), blk_rq_sectors(rq), mask);
So it seems that neither the position nor the number of sectors is
aligned to eight. I assume that the md subsystem is supposed to handle this?
I then double-checked for sizes for the underlying block devices and the
md device itself:
So it's 4K for all of them.
Here's the hdparm output for one of the drives:
The drives themselves are fine, I can use them properly as standalone
devices, so I rule out a hardware error.
Any hints how to further triage this? Also would it help to open a bug
on the kernel bugtracker?
Thanks in advance!
With best wishes,
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2021-01-29 20:31 Problem with initial sync of a RAID1 with 4Kn drives Tobias Jakobi
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