[OmniOS-discuss] rpool mirroring alignment problem

[Natxo Asenjo]

On Wed, Jun 11, 2014 at 8:12 PM, Paul B. Henson <henson at acm.org> wrote:

> On Wed, Jun 11, 2014 at 07:01:01PM +0200, Natxo Asenjo wrote:
>
> >        1. c4t13d1 <ATA-WDCWD1600BJKT-7-1A11 cyl 19454 alt 2 hd 255 sec
> 63>
> >           /pci at 0,0/pci1022,9603 at 2/pci1014,3b1 at 0/sd at d,1
> >        2. c4t14d1 <ATA-WDCWD2500BPVT-0-1A01 cyl 30398 alt 2 hd 255 sec
> 63>
> >           /pci at 0,0/pci1022,9603 at 2/pci1014,3b1 at 0/sd at e,1
> [...]
> > # zpool attach -f rpool c4t13d1s0 c4t14d1s0
> > cannot attach c4t14d1s0 to c4t13d1s0: devices have different sector
> > alignment
> >
> > Any ideas?
>
> Looks like the WD2500BPVT has "Advanced Format Technology", ie 4k
> sectors:
>
> http://www.newegg.com/Product/Product.aspx?Item=N82E16822136565
>
> Whereas the WD1600BJKT is a classic 512 byte sector device.
>
> You can't currently add a 4k sector drive to a vdev using 512 byte sectors.
> Any chance you could do the initial install to the 4k device, and then
> add the 512 byte device as the second half of the mirror? I think that
> would work. Or you could trick the OS into thinking the 512 byte device
> actually has 4k sectors...
>
> http://blog.delphix.com/gwilson/2012/11/15/4k-sectors-and-zfs/
>

thanks for the info. I think I will reinstall to the WD2500BPVT after a
quick read of both your link and Dale's ...

-- 
regards,
natxo
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