>
>
> Hi,
>
> I'm trying to create an XFS image to be written on a Blue Ray disk, encrypted. I'm told that DVDs have a sector size of 2 KiB, thus it is beter to tell the formatting utility of that, because when creating the image file it is on a hard disk where sector size is 512B.
>
> Basic procedure:
>
> truncate -s 50050629632 image_1_50.img
> losetup -f image_1_50.img
> cryptsetup luksFormat --type luks2 --label blueray50img /dev/loop0
> cryptsetup luksOpen /dev/loop0 cr_nombre
>
>
> So now I have the image file loop mounted on /dev/mapper/cr_nombre, and I do (this is the step I ask about):
>
> Telcontar:/home_aux/BLUERAY_OPS # mkfs.xfs -L ANameUnseen -b size=2048 /dev/mapper/cr_nombre
^^^ block size
> meta-data=/dev/mapper/cr_nombre isize=512 agcount=4, agsize=6109184 blks
> = sectsz=512 attr=2, projid32bit=1
> = crc=1 finobt=1, sparse=0, rmapbt=0
> = reflink=0
> data = bsize=2048 blocks=24436736, imaxpct=25
^^^ block size
> = sunit=0 swidth=0 blks
> naming =version 2 bsize=4096 ascii-ci=0, ftype=1
> log =internal log bsize=2048 blocks=11932, version=2
> = sectsz=512 sunit=0 blks, lazy-count=1
> realtime =none extsz=4096 blocks=0, rtextents=0
> Telcontar:/home_aux/BLUERAY_OPS #
>
>
> Is that the correct command line to achieve written sectors of 2 KiB?
If you want to set the sector size, the instructions are in the man page for
mkfs.xfs ;)
-s sector_size
This option specifies the fundamental sector size of the
filesystem. The sector_size is specified either as a value in
bytes with size=value or as a base two logarithm value with
log=value. The default sector_size is 512 bytes. The minimum
value for sector size is 512; the maximum is 32768 (32 KiB). The
sector_size must be a power of 2 size and cannot be made larger
than the filesystem block size.
-Eric
> I ask because I see isize=512 and sectsz=512 and I wonder.
>
>
> -- Cheers,
> Carlos E. R.
> (from openSUSE 15.0 x86_64 at Telcontar)
>
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