次の様に /tmp 以下に zip を作成していたら，エラー（No space left on device）に．
Iwao@DS116:/tmp/Iwao/i_Tools.tmp/20190121/tst$ zip /tmp/Iwao/i_Tools.tmp/20190121/tst/zzzzzz.zip -r /volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/ adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/ (stored 0%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/a.out (deflated 71%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/l7z.out (deflated 71%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/zip.out (deflated 71%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/bak/ (stored 0%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/bak/t_call_z.dsp (deflated 73%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/bak/t_call_z.BAK (deflated 65%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/t_call_z.cpp (deflated 65%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/tmp/ (stored 0%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/tmp/tst_.zip.000._7.zip (stored 0%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/tmp/tst_.zip_.000.zip (stored 0%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/tmp/tst_.zip_.001.zip7.zip (stored 0%) adding: volume1/homes/Iwao/gcc_test/Test/T_zip/zip/t_call_z/tmp/t_call_z.001.zip zip I/O error: No space left on device zip error: Output file write failure (write error on zip file) Iwao@DS116:/tmp/Iwao/i_Tools.tmp/20190121/tst$
空き容量を表示する df コマンドで確認すると，
Iwao@DS116:/tmp/Iwao/i_Tools.tmp/20190121/tst$ df -h Filesystem Size Used Avail Use% Mounted on /dev/sda1 2.3G 920M 1.3G 42% / none 502M 0 502M 0% /dev /tmp 504M 501M 2.7M 100% /tmp /run 504M 4.9M 499M 1% /run /dev/shm 504M 4.0K 504M 1% /dev/shm none 4.0K 0 4.0K 0% /sys/fs/cgroup /dev/sda3 2.7T 495G 2.2T 19% /volume1 Iwao@DS116:/tmp/Iwao/i_Tools.tmp/20190121/tst$
確かに空いていない．
NAS を再起動して対応．
