problem in mounting cdrom drive

[K.Mohana]

first cdrom drive working with id 4 and special file /dev/dsk/c1t4d0. after 10-15 days when i tried to mount cd it has given error
" no such device or address"
this time i have chaged the id 6.now i am able to mount the cd with out any problem. after one month again the same probelm with cd mount. it is giving "no such device or address"
system config is: Hp 9000 / E45 server / 2*2GB HDD /DDS1
pls help me to resolve this problem

[Domenico_5]

Hi mohana

if you run ioscan -fnkCdisk (k for kerner) you can see the special file?

If you change cd have the same problem?

[K.Mohana]

i did the followings
#ioscan -funC disk
#rmsf -H
#reboot

connected other CDROM drive.and startded server.
#mount /dev/dsk/c1t6d0 /CDROM
it has mountd without any problem.
i.e is problem with CDROM drive. why this CDROM drives are getting defective with in short period. is there any server hardware related problem...

[U.SivaKumar_2]

hi,
connect the old CDROM drive. boot the machine
and run ioscan -fnC disk
search for the CDROM drive in the output . what
is the H/W status and S/W status of that drive in the above output?.
Did you try changing scsi cable which connects CDROM drive ?.
regards,
U.SivaKumar

[Ulf Lipski]

Hi,

where is the cdrom located at the scsi-bus? Please check the termination and the termination power. I think this is a scsi-bus problem.