Re: Why is disk full?

You may have large files with "holes" in them (i.e. sparse files).  Rsync has a --sparse
(-S) flag that tries to create holes in the replicated files when it finds sequences of
nulls in the source file.

The -a flag does not turn on this sparse file handling.

You can run "du" on different directories to narrow down where the file size difference is
coming from.

    - Aner

On 3/29/22 10:58, F Bax wrote:
> I used rsync to copy files.
> sudo rsync -anv --delete /mnt/wd1l/ /mnt/wd2l/
> reports no changes required (runtime under 3 minutes).
> sudo diff -r /mnt/wd1l/ /mnt/wd2l/
> reports no difference (runtime 10 hours)
>
> $ sudo df -i /mnt/wd1l/ /mnt/wd2l/
> Filesystem 512-blocks Used Avail Capacity iused ifree %iused
> Mounted on
> /dev/wd1l 2138940784 1997329632 34664128 98% 483707 33313411 1%
> /mnt/wd1l
> /dev/wd2l 2138951776 2033043696 -1039504 100% 483707 33313411 1%
> /mnt/wd2l
>
> On Tue, Mar 29, 2022 at 10:49 AM F Bax <fbax.ca@gmail.com> wrote:
>
>> I used rsync to copy files. df -i reports 483707 inodes used for both
>> partitions.
>> sudo rsync -anv --delete /mnt/wd1l/ /mnt/wd2l/
>> reports no changes required (runtime under 3 minutes).
>> sudo diff -r /mnt/wd1l/ /mnt/wd2l/
>> reports no difference (runtime 10 hours)
>>
>> On Tue, Mar 29, 2022 at 10:39 AM Otto Moerbeek <otto@drijf.net> wrote:
>>
>>> On Tue, Mar 29, 2022 at 10:25:34AM -0400, F Bax wrote:
>>>
>>>> I copied all files from /mnt/wd1l to /mnt/wd2l
>>>>
>>>> wd2l is slightly larger than wd1l; yet wd2l is full!
>>>>
>>>> $ df -h /mnt/wd1l /mnt/wd2l
>>>> Filesystem Size Used Avail Capacity Mounted on
>>>> /dev/wd1l 1020G 952G 16.5G 98% /mnt/wd1l
>>>> /dev/wd2l 1020G 969G -508M 100% /mnt/wd2l
>>> How did you copy? Some forms of copy will cause hardlinked files to be
>>> separate files on the destination. df -i will tell how many inodes you
>>> have used. If wd2l has more inodes in use, I bet it's that.
>>>
>>> -Otto
>>>
>>>> Output from disklabel is almost identical:
>>>>
>>>> type: SCSI
>>>> disk: SCSI disk
>>>> label: WDC WD2000FYYZ-0
>>>> flags:
>>>> bytes/sector: 512
>>>> sectors/track: 63
>>>> tracks/cylinder: 255
>>>> sectors/cylinder: 16065
>>>> cylinders: 243201
>>>> total sectors: 3907029168
>>>> rpm: 0
>>>> interleave: 1
>>>> trackskew: 0
>>>> cylinderskew: 0
>>>> headswitch: 0 # microseconds
>>>> track-to-track seek: 3907029168 # microseconds
>>>> drivedata: 0
>>>>
>>>> Difference between wd1 and wd2:
>>>> wd1: interleave: 0
>>>> wd2: interleave: 1
>>>>
>>>> Partition details (A added 'wd1/wd2' to beginning of line:
>>>> # size offset fstype [fsize bsize cpg]
>>>> wd1l: 2147472640 525486208 4.2BSD 8192 65536 1
>>>> wd2l: 2147483647 63 4.2BSD 8192 65536 1
>>>>
>>>> Why is wd2l full?