Hi Benoît,
On Mon, Nov 8, 2021 at 4:31 PM Benoît Knecht <bknecht@xxxxxxxxxxxxx> wrote:
>
> Hi Dan,
>
> On Thursday, November 4th, 2021 at 11:33, Dan van der Ster <dan@xxxxxxxxxxxxxx> wrote:
> > - Are we running the same firmware as you? (We have 0104). I wonder if
> > Toshiba has changed the implementation of the cache in the meantime...
>
> I just checked, and all our Toshiba MG07ACA14TE drives run firmware version 0101; and as far as I know, Toshiba doesn't provide firmware images for its drives, so I don't think it's possible to upgrade/downgrade the firmware on those drives.
>
> > - Is anyone aware of some HBA or other setting in the middle that
> > might be masking this setting from reaching the drive?
>
> In our case it's an LSI SAS3008 card, and we disable the write cache with `smartctl --set=wcache,off /dev/sdX`.
Eventually we found it necessary to make the change by
echo 'write through' > /sys/class/scsi_disk/sdX/cache_type
And now we have a udev rule to apply it to all sata/scsi disks:
# cat /etc/udev/rules.d/99-ceph-write-through.rules
ACTION=="add", SUBSYSTEM=="scsi_disk", ATTR{cache_type}:="write through"
Thanks!
Dan
>
> Cheers,
>
> --
> Ben
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