On Wed, Jun 15, 2016 at 06:17:37PM +, Arvind Kumar wrote:
> It is possibly some race. We saw a WRITE SAME related issue in past
> for which Petr sent out a patch but looks like the patch didn't make
> it. :(
>
> https://groups.google.com/forum/#!topic/linux.kernel/1WGDSlyY0y0
Indeed - the inv
Sent: Tuesday, May 31, 2016 10:04 PM
To: Tom Yan
Cc: Darrick J. Wong; Shaohua Li; Jens Axboe; Arvind Kumar; VMware PV-Drivers;
linux-r...@vger.kernel.org; linux-scsi@vger.kernel.org;
linux-bl...@vger.kernel.org; linux-ker...@vger.kernel.org
Subject: Re: BLKZEROOUT not zeroing md dev on VMDK
On 2
On 27 May 2016 at 10:30, Tom Yan wrote:
> There seems to be some sort of race condition between
> blkdev_issue_zeroout() and the scsi disk driver (disabling write same
> after an illegal request). On my UAS drive, sometimes `blkdiscard -z
> /dev/sdX` will return right away, even though if I then c
There seems to be some sort of race condition between
blkdev_issue_zeroout() and the scsi disk driver (disabling write same
after an illegal request). On my UAS drive, sometimes `blkdiscard -z
/dev/sdX` will return right away, even though if I then check
`write_same_max_bytes` it has turned 0. Some
On 27 May 2016 at 05:18, Darrick J. Wong wrote:
>
> It's possible that the pvscsi device advertised WRITE SAME, but if the device
> sends back ILLEGAL REQUEST then the SCSI disk driver will set
> write_same_max_bytes=0. Subsequent BLKZEROOUT attempts will then issue writes
> of zeroes to the driv
On Wed, May 18, 2016 at 11:39:30PM +0100, Sitsofe Wheeler wrote:
> Hi,
>
> With Ubuntu's 4.4.0-22-generic kernel and a Fedora 23
> 4.6.0-1.vanilla.knurd.1.fc23.x86_64 kernel I've found that the
> BLKZEROOUT syscall can malfunction and not zero data.
>
> When BLKZEROOUT is issued to an MD device a
Hi,
With Ubuntu's 4.4.0-22-generic kernel and a Fedora 23
4.6.0-1.vanilla.knurd.1.fc23.x86_64 kernel I've found that the
BLKZEROOUT syscall can malfunction and not zero data.
When BLKZEROOUT is issued to an MD device atop a PVSCSI controller
supplied VMDK from ESXi 6.0 the call returns immediatel
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