what does synchronous IO waits,asynchronous read IO waits,asynchronous write IO waits signify???
i had the other job which showed the following things-
IO waits Count time
synchronous IO waits 651 3 mins
asynchronous read IO waits 570812 2 hours 14 mins
Asynchrnous write IO waits 0 0
how the following waits different??
sometimes i see synchronous IO waits more while sometimes i see asynchronous read IO waits abnormally more .what does they signify and how do they affect system performance???
Also i got some message like this-
20.32.18 *IEA480E 959F,DASD,SERIOUS ALERT,MT=2107,SER=0507-04221, 682
682 REFCODE=E475-0000-01C2,VOLSER=OTE006,ID=19,SENSE=00001F10 1F
682 33800000 0001C214 0700107D 9582E475 05100200 FE000000
however from DBA side i saw that the tablespace needs to be reorged.but then is it reorg problem or DASD problem????