Re: I/O error on dd commands

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On 12/5/2016 7:41 AM, Tomita.Haruo@xxxxxxxxxxxxxxxxx wrote:
Hi Moni,

Does a rxe driver of vanilla 4.9-rc6 fine work?
When the dd command is tested for a read and write, it'll be the following error.

(read)
# dd if=/dev/nvme0n1 of=<readfile>.bin bs=1024 count=10000 iflag=direct

blk_update_request: I/O error, dev nvme0n1, sector 1860
nvme nvme0: reconnecting in 10 seconds
nvme nvme0: Successfully reconnected

or

nvme nvme0: failed nvme_keep_alive_end_io error=16391
nvme nvme0: reconnecting in 10 seconds
nvme nvme0: Successfully reconnected

(write)
# dd if=<writefile>.bin of=/dev/nvme0n1 bs=1024 count=10000 oflag=direct

blk_update_request: I/O error, dev nvme0n1, sector 1860
nvme nvme0: reconnecting in 10 seconds
nvme nvme0: Successfully reconnected

or

nvme nvme0: failed nvme_keep_alive_end_io error=16391
nvme nvme0: reconnecting in 10 seconds
nvme nvme0: Successfully reconnected

I'd like to investigate the root cause of this error, are there any ideas?

Hi Haruo,

can you try to repro it with iSER ?
what is your backing store device ?
is this happens in 1k bs only or in different bs as well ?

thanks,
Max.
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