Re: RAID6: "Bad block number requested"

Re: RAID6: "Bad block number requested"

[Sebastian Hegler]

Dear James, dear all,

this is to let you know that I'll not pursue this issue further. I spent some days building a test system, but I could not reproduce the error.
There's a tool named HUGO by HGST/Western Digital to re-configure the HDD's firmware to use 512byte blocks, which solved the problem for me.

Sorry about the bad news.

Yours,
Sebastian


Am 14.06.2018 um 14:11 schrieb Sebastian Hegler <sebastian.hegler@tu-dresden.de>:
> Dear James, dear all!
> 
> Am 11.06.2018 um 17:06 schrieb James Bottomley <James.Bottomley@HansenPartnership.com>:
>> This means that somehow, something sent a non 4k aligned 4k sized
>> request. SCSI here is just the messenger.  However, if you apply this
>> patch, it will capture the stack trace of what above it triggered this,
>> which may help us in debugging.  It could be we may also want to see
>> what the values of block and blk_rq_sectors(rq) actually are, but lets
>> begin with the stack trace.
>> ---
>> 
>> diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
>> index 9421d9877730..ac865e048533 100644
>> --- a/drivers/scsi/sd.c
>> +++ b/drivers/scsi/sd.c
>> @@ -1109,6 +1109,7 @@ static int sd_setup_read_write_cmnd(struct scsi_cmnd *SCpnt)
>> 		if ((block & 7) || (blk_rq_sectors(rq) & 7)) {
>> 			scmd_printk(KERN_ERR, SCpnt,
>> 				    "Bad block number requested\n");
>> +			WARN_ON_ONCE(1);
>> 			goto out;
>> 		} else {
>> 			block = block >> 3;
> I'll give that a try. But don't expect to hear from me soon, I'll need to build a test system for that. The error occurred in a production system, which I am very hesitant to re-boot, let alone insert drives that cause error messages.
> 
> Yours sincerely,
> Sebastian