Re: Regarding LVM Snapshot

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Hi Ranjan,

On Mon, 2014-03-17 at 12:18 +0000, Ranjan Kumar2 wrote:
> Hi nab,
> 
> I forgot to mention that i'm using Linux kernel 3.8.6 and FileIO.
> 
> Regards,
> Ranjan
> 
> On Mon, 2014-03-17 at 13:51 +0530, Ranjan S wrote:
> > Hi nab,
> > 
> > I am trying to create a iSCSI drive on top of lvm2 snapshot. but my
> > drive format operation fails and gives an error
> > 
> > "SCSI OP 28h with too big sectors 16 exceeds backend hw_max_sectors: 8"
> > 
> > my device max sector size is 8. But I am sure this worked fine with
> > older generations of iSCSI targets.
> > 
> > It would be great if you could help me or guide me to  patch which can
> > solve the issue.
> > 
> > 

So there are a few patches that v3.8.y needs in order to avoid this
issue.

The first from v3.9.y is:

target: Use FD_MAX_SECTORS/FD_BLOCKSIZE for blockdevs using fileio
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/target/?h=linux-3.9.y&id=8cb3a88522df20a6d77934260040facfc0449f0e

and the second from v3.10.y is:

target/file: Update hw_max_sectors based on current block_size
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/target/?h=linux-3.10.y&id=480da400c39d5c4398765623c7bb007a359a059f

I'd also recommend applying the following from v3.9.y:

target/file: Fix off-by-one READ_CAPACITY bug for !S_ISBLK export
https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/drivers/target/?h=linux-3.9.y&id=0813b7c39d5d046feb9e7a632abd09aaafae056e

--nab



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