unsigned long desired_io = max_requests * sizeof(union viosrp_iu);
/* add io space for sg data */
- desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT *
+ desired_io += (IBMVSCSI_MAX_SECTORS_DEFAULT * 512 *
IBMVSCSI_CMDS_PER_LUN_DEFAULT);
return desired_io;