3PB Written, 800 Sectors Reallocated

So, another petabyte written and the disk is still working well - no unrecoverable errors so far and no drop in performance. Sector fails are creeping up steadily - just under 800 to date - but so far all these have occurred when the flash was being erased rather than written to. The SSD controller appears to be coping fine, allocating spare sectors from its reserved pool (14% used, 86% remaining):

ID# ATTRIBUTE_NAME          VALUE WORST THRESH TYPE      RAW_VALUE
  5 Reallocated_Sector_Ct   086   086   010    Pre-fail  797
  9 Power_On_Hours          099   099   000    Old_age   3034
 12 Power_Cycle_Count       099   099   000    Old_age   169
177 Wear_Leveling_Count     053   053   000    Pre-fail  2788
179 Used_Rsvd_Blk_Cnt_Tot   086   086   010    Pre-fail  797
181 Program_Fail_Cnt_Total  100   100   010    Old_age   0
182 Erase_Fail_Count_Total  086   086   010    Old_age   797
183 Runtime_Bad_Block       086   086   010    Pre-fail  797
187 Reported_Uncorrect      100   100   000    Old_age   0
190 Airflow_Temperature_Cel 065   060   000    Old_age   35
195 Hardware_ECC_Recovered  200   200   000    Old_age   0
199 UDMA_CRC_Error_Count    100   100   000    Old_age   0
235 Unknown_Attribute       099   099   000    Old_age   30
241 Total_LBAs_Written      097   097   000    Old_age   5859439678108

The disk that was rated for 150TB of writes has now reached 20 times that and still has life in it. But there will be a cost - it is likely that the data retention period when powered off is much less than the warranted 12 months.  When powered on, the controller should periodically check that all cells are readable and swap out any looking a bit dodgy.

As previously, we will now conduct a mini retention test by powering the disk off for a week, and then checking that we can read back the huge file filling it correctly.