cp : 0653-447 Requested a write of 4096 bytes, but wrote only 3584.

As user oracle I was trying to copy the Oracle binaries which I had downloaded and were under /home/root on an AIX7.1 machine.

$ cp -p /home/root/aix.ppc64_11gR2_database_1of2.zip .
cp : 0653-447 Requested a write of 4096 bytes, but wrote only 3584.
$ ulimit -a
time(seconds)        unlimited
file(blocks)         2097151
data(kbytes)         131072
stack(kbytes)        32768
memory(kbytes)       32768
coredump(blocks)     2097151
nofiles(descriptors) 2000
threads(per process) unlimited
processes(per user)  unlimited

$ ulimit -f unlimited
ksh: ulimit: 0403-045 The specified value is outside the user's allowable range.

Edited the /etc/security/limits file and added fsize = -197151 for oracle user as shown below.

isvp18> vi /etc/security/limits

pconsole:
stack_hard = 131072
data = 1280000
data_hard = 1280000

oracle:
fsize = -197151


isvp18> su - oracle
$ ulimit -f unlimited
$ ulimit -a
time(seconds)        unlimited
file(blocks)         unlimited
data(kbytes)         131072
stack(kbytes)        32768
memory(kbytes)       32768
coredump(blocks)     2097151
nofiles(descriptors) 2000
threads(per process) unlimited
processes(per user)  unlimited

$ cp /home/root/aix.ppc64_11gR2_database_1of2.zip .
$ cp /home/root/aix.ppc64_11gR2_database_2of2.zip .
$ cksum /home/root/aix.ppc64_11gR2_database_1of2.zip
1915658395 1564425851 /home/root/aix.ppc64_11gR2_database_1of2.zip
$ cksum aix.ppc64_11gR2_database_2of2.zip
1152318705 1007010341 aix.ppc64_11gR2_database_2of2.zip

Copy went through fine at the end :-)