Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1407802

Re: BLKZEROOUT not zeroing md dev on VMDK

Show all headers | View raw

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 atop a PVSCSI controller
> supplied VMDK from ESXi 6.0 the call returns immediately and with a zero
> return code. Unfortunately, inspecting the data on the MD device shows
> that it has not been zeroed and is in fact untouched. The easiest way to
> see this behaviour is to boot the VM, create an mdadm device atop
> /dev/sd?, scribble some non-zero value on the disk and then use
> blkdiscard --zeroout /dev/md??? . If you then inspect the MD disk (e.g.
> with hexdump) you will still see the old data and using POSIX_FADV_DONTNEED
> on the MD device doesn't change the outcome.
> 
> The only clue I've seen is that
> /sys/block/sd?/queue/write_same_max_bytes starts out being 33553920 but
> after a WRITE SAME is issued it becomes 0. If the MD device is created
> after write_same_max_bytes has become 0 on the backing disk then
> BLKZEROOUT seems to work correctly.

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 drive.

--D

> 
> -- 
> Sitsofe | http://sucs.org/~sits/

Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

BLKZEROOUT not zeroing md dev on VMDK Sitsofe Wheeler <sitsofe@gmail.com> - 2016-05-19 00:40 +0200
  Re: BLKZEROOUT not zeroing md dev on VMDK "Darrick J. Wong" <darrick.wong@oracle.com> - 2016-05-27 06:20 +0200
    Re: BLKZEROOUT not zeroing md dev on VMDK Sitsofe Wheeler <sitsofe@gmail.com> - 2016-05-27 06:50 +0200
      Re: BLKZEROOUT not zeroing md dev on VMDK Tom Yan <tom.ty89@gmail.com> - 2016-05-27 11:40 +0200

csiph-web