Being very unhappy with IBM 600Gb 15k rpm drives (6 out of 12 replaced during 2 years) I've decided to replace. I was very curious how ibm would handle third-party drives, looked trough all the redbooks, searched all over the internet - didn't found the answer. Asked here on forums - some guy answered that I the same drives as ibm ships would be Ok. Being fan of HGST (not a single failure during last years, using 30-40 drives in backup shelves) I choosed 2Tb SAS HUS723020ALS64 (IBM should support it in latest RAID firmwares). Ordered 6 drives, placed one drive instead of old global spare - got Unsupported Drive alert. Updated controller fw to latest version 1.3.1.010 - the same Unsupported Drive alert, not able to bring drive online and configure.
So guys just to warn you - don't try to fool IBM installing the same drives ordered from local store for 200eur, you forced to buy IBM ones for 500eur each. -(