I should also have mentioned that I've run the self-test on the drive
(no problems reported) and verified that the drive firmware is at the
level currently being offered by Samsung for download.

On Fri, 2022-11-18 at 15:30 +0000, Peter Duffy wrote:
> Correction - they're Samsung 870 EVOs.
>
> Sorry.
>
>
> On Fri, 2022-11-18 at 15:25 +0000, Peter Duffy wrote:
> > I recently bought a couple of Samsung 1T EVO 970 SSDs to do some
> > work:
> > basically I need to simulate the loading of a fairly big mysql
> > database
> > (>80G). I'm currently hitting a very weird problem.
> >
> > The mysql is percona 5.7. I attach the disk via USB3, partition it,
> > create an ext4 fs on one of the partitions, mount it, create a
> > directory on it, configure mysql to use it as the datadir, and then
> > initialise it for mysql use. All good so far. I then start the
> > mysql
> > dataload, and it's progressing happily. 
> >
> > Then the mysql server bombs out, and messages like the following
> > appear
> > in the dmesg output:
> >
> > [19718.093317] sd 12:0:0:0: [sdf] tag#21 FAILED Result:
> > hostbyte=DID_OK driverbyte=DRIVER_SENSE cmd_age=27s
> > [19718.093327] sd 12:0:0:0: [sdf] tag#21 Sense Key : Illegal
> > Request
> > [current]
> > [19718.093330] sd 12:0:0:0: [sdf] tag#21 Add. Sense: Invalid
> > command
> > operation code
> > [19718.093333] sd 12:0:0:0: [sdf] tag#21 CDB: Synchronize Cache(10)
> > 35 00 00 00 00 00 00 00 00 00
> > [19718.093340] blk_update_request: critical target error, dev sdf,
> > sector 0 op 0x1:(WRITE) flags 0x800 phys_seg 0 prio class 0
> >
> > I'm trying to decide whether I'm just dealing with a borked SSD (it
> > came from Amazon: yeah, I know - if I will buy SSDs from that
> > source,
> > what do I expect?) - or something more subtle and/or complex.
> > Reading
> > the above messages literally, they seem to indicate that a command
> > is
> > being sent to the SSD and it's not understanding it.
> >
> > Any thoughts would be most gratefully welcomed.
> >
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>
>
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