Any progress about the problme?
Should we disable the write same when stack the different LBA disks?
On 2/2/2019 12:18 AM, Christoph Hellwig wrote:
On Fri, Feb 01, 2019 at 05:03:40PM +0100, Heinz Mauelshagen wrote:
On 2/1/19 3:09 PM, John Dorminy wrote:
I didn't know such a thing existed... does it work on any block
device? Where do I read more about this?
Use sg_write_same(8) from package sg3_utils.
For instance 'sg_write_same --in=foobarfile --lba=0 --num=20000
--xferlen=512 /dev/sdwhatever'
will read the pattern to write same from file 'foobarfile' with length
explicitely set to 512 bytes
(rather than derived from foobarfile's size) and write it 20000 times
starting at LBA 0 to /dev/sdwhatever.
Yeah. Note that this will only work on SCSI disks (and maybe ATA
for a very specific corner case). But for actual devices and not
remappers the same is true of REQ_OP_WRITE_SAME.
.
