Re: Long checkpoint woe

Posted in 2006

Clive Eisen — Tue, 28 Mar 2006 22:37:27 +0100 — source: Usenet: comp.databases.informix

Neil Truby wrote: > "Roy Mercer" <roy.mercer@gmail.com> wrote in message > news:1143575685.269708.17040@v46g2000cwv.googlegroups.com... >> Use /dev/null for if and then for of. > # time dd of=/dev/md/rdsk/d121 if=/dev/null bs=2k > 0+0 records in > 0+0 records out > erm try if=/dev/zero or summat that produces bytes :-)

↪ replying to Clive Eisen

Neil Truby — Tue, 28 Mar 2006 23:03:55 +0100 — source: Usenet: comp.databases.informix

"Clive Eisen" <clive@serendipita.com> wrote in message news:4429ac81$0$5012$db0fefd9@news.zen.co.uk... > Neil Truby wrote: >> "Roy Mercer" <roy.mercer@gmail.com> wrote in message >> news:1143575685.269708.17040@v46g2000cwv.googlegroups.com... >>> Use /dev/null for if and then for of. >> # time dd of=/dev/md/rdsk/d121 if=/dev/null bs=2k >> 0+0 records in >> 0+0 records out >> > > erm try if=/dev/zero or summat that produces bytes :-) # time dd of=/dev/md/rdsk/d121 if=/dev/zero bs=2k dd: unexpected short write, wrote 0 bytes, expected 2048 10241+0 records in 10241+0 records out real 1m40.57s user 0m0.00s sys 0m0.64s # time dd if=/dev/md/rdsk/d121 of=/dev/null bs=2k 10240+0 records in 10240+0 records out real 0m5.79s user 0m0.00s sys 0m0.32s # time dd of=/dev/md/rdsk/d121 if=/dev/zero bs=2k dd: unexpected short write, wrote 0 bytes, expected 2048 10241+0 records in 10241+0 records out real 1m37.17s user 0m0.01s sys 0m0.58s

Glossary

checkpoint