On Thu, May 10, 2007 at 09:06:14AM -0700, AndiSHFR wrote: > Here is an example: > > sv-vmhost02:/home# date ; time dd if=/dev/zero of=test.dat bs=1MB > count=1000 ; date > > Thu May 10 17:53:45 CEST 2007 > 1000+0 records in > 1000+0 records out > 1000000000 bytes (1.0 GB) copied, 2.89129 seconds, 346 MB/s > > real 0m58.632s > user 0m0.000s > sys 0m3.480s > Thu May 10 17:54:44 CEST 2007 > > sv-vmhost02:/home# > > The date output shows that the dd did run from 17:53:45 to 17:54:44. > > But the dd command thinks it only took 2.8 seconds to create the 1 GB > file -of course with a top thruput of 346 MB/s. > > But the time-command shows that the dd really took 58 seconds. > > So the real thruput was around 17 MB/s > > So i think the whole hardware is freezing an the os does not see it > because there are > no error messages in dmesg. > > When doing a "iostat -mxtc 1" during the dd it is shown that write > thruput of the /dev/sda drops to zero for seconds (typically 10 > seconds) and then rises again. > > Any idea where to start searching for?
output of "hdparm -l /dev/sda" ? -- Chris. ====== -- To UNSUBSCRIBE, email to [EMAIL PROTECTED] with a subject of "unsubscribe". Trouble? Contact [EMAIL PROTECTED]
