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seen Nov 29 '12 at 0:57

Nov
15
awarded  Tumbleweed
Oct
27
answered MySQL InnoDB - innodb_file_per_table cons?
Oct
27
comment Linux software RAID5 on SSD. One SSD 40% more worn out than the others
As of today, the SSD has an average erase count of 232, while the other drives have an average erase count only approximately 150. The smartctl command translates this into 93% life left and roughly 96% life left respectively . As I was saying, in the same period, that drive manages to use up 3% more erase cycles than the rest of the drives. pastebin.com/raw.php?i=iZz87YWR
Oct
27
comment Linux software RAID5 on SSD. One SSD 40% more worn out than the others
sorry for the very late reply. The drives have been running since July 2012
Sep
5
comment Linux software RAID5 on SSD. One SSD 40% more worn out than the others
Thanks, and again, I agree with you. These SSD drive are rated for more than 3,000 erase cycles. In that regard it is a very small difference. But it does not explain why this one drive is worn out 40% more than the other drives, as part of the same RAID, created at the same instance of time. These drives have not been individually benchmarked in any way, so our workload is the only reason they can be worn out. Also, if this pattern continues, that one SSD will hit the rated 3,000 erase cycle while the other drives were only at 2000. Even though that is not for a few years later.
Sep
5
comment Linux software RAID5 on SSD. One SSD 40% more worn out than the others
Thanks, I agree with you one device is currently at 97% life and the rest is at 98%. What I am asking is the raw value for attribute 173, which for my setup says for "sdi", the average erase count for the flash chip is 105 cycles, while for the others is only 66 ~ 71. This is more than 40% difference in the average erase count.
Sep
5
comment Linux software RAID5 on SSD. One SSD 40% more worn out than the others
Sorry, I was talking about the last column from smartctl output. The last column "RAW_VALUE" for 5 devices for attribute 173 is around 70. But for "sdi" it is over 100. According to the manual for this SSD (micron.com/~/media/Documents/Products/Technical%20Note/…) the value for 173 is "Average erase count of all good blocks" The values you are talking about is value 202 "Percentage Of The Rated Lifetime Used" thanks
Sep
4
asked Linux software RAID5 on SSD. One SSD 40% more worn out than the others
Sep
4
awarded  Student