On 12/20/18 9:13 AM, Luciano ES wrote: > I have a new drive for backups. > I copied everything over and now I have this problem: > > Filesystem Size Used Avail Use% Mounted on > /dev/sda1 931G 914G 18G 99% /xx > /dev/sdb1 931G 920G 11G 99% /xxbkp > > So 914GB from the old drive expand and become 920GB. The new drive > is supposed to be the same size, but for some reason it can't > really hold it all. I will be forced to waste precious gigabytes. > > I tried to format the new one exactly like the old one, but > it was not possible: > > $ xfs_info /xx > meta-data=/dev/sda1 isize=256 agcount=8, agsize=30506944 blks > = sectsz=4096 attr=2, projid32bit=1 > = crc=0 finobt=0 spinodes=0 rmapbt=0 > = reflink=0 > data = bsize=4096 blocks=244055552, imaxpct=25 > = sunit=0 swidth=0 blks > naming =version 2 bsize=4096 ascii-ci=0 ftype=0 > log =internal bsize=4096 blocks=119167, version=2 > = sectsz=4096 sunit=1 blks, lazy-count=1 > realtime =none extsz=4096 blocks=0, rtextents=0 > > > $ xfs_info /xxbkp > meta-data=/dev/sdb1 isize=512 agcount=8, agsize=61013888 blks > = sectsz=512 attr=2, projid32bit=1 > = crc=1 finobt=1 spinodes=1 rmapbt=0 > = reflink=0 > data = bsize=2048 blocks=488111104, imaxpct=25 > = sunit=0 swidth=0 blks > naming =version 2 bsize=4096 ascii-ci=0 ftype=1 > log =internal bsize=2048 blocks=238335, version=2 > = sectsz=512 sunit=0 blks, lazy-count=1 > realtime =none extsz=4096 blocks=0, rtextents=0 > > > I guess at least part of the problem is CRC enabled in the second > one. So, is there anything I can do to make all the data fit in the > new drive? Well, you have larger inodes on xxbkp for starters. If you want, # mkfs.xfs -m crc=0,finobt=1 -i sparse=0 -n ftype=0 should get you the same geometry. This is all documented in the mfks.xfs manpage, btw. But beware that copying sparse files w/o maintaining sparseness (for example) will also consume more space. If you want a nothing less than a bit-for-bit copy, use dd. ;) -Eric
