What does this mean : Defering I/O (Error 5)

[Toulouse]

I've got an AlphStation DS10 which comes back to SRM after a few hours of work.
I made a small batch program which test the scsi channel.
After one hour running, I get the error : Defering I/O (Error 5).
I swap the scsi card and run the program an other time and I get the same error after a few hours.
Does it mean that the disk have a problem ?
Thanks

[Eric van Dijken]

Yes, your disk has a problem. You could try to get more information with the "uerf -R | more" command.

When the disk will really fail, is hard to tell. But most of the times this is one of the first (and sometimes the last) error you will get.

[Ralf Puchner]

uerf is not very helpful on a DS10. Time to open a call within the HP support center providing binary.errlog for analyze.

[Toulouse]

Thanks everyone for the answers....
In my case, it was the disk.... I change it and it's two days with no errors.