Hi, I installed my new laptop on Saturday and setup an ext4 filesystem on my / and /home partitions. Without me doing much file transfers, I noticed today: jak@jak-x230:~$ cat /sys/fs/ext4/sdb3/lifetime_write_kbytes 342614039 This is on a 100GB partition. I used fstrim multiple times. I analysed the increase over some time today and issued an fstrim in between: 2013-09-12 15:53 341.582.779 2013-09-12 15:54 341.582.971 2013-09-12 15:58 341.583.103 2013-09-12 16:01 341.584.095 2013-09-12 16:04 341.584.475 2013-09-12 16:05 341.584.623 <fstrim -v /home => /home/: 1052205056 bytes were trimmed> 2013-09-12 16:07 342.612.167 2013-09-12 16:08 342.612.323 2013-09-12 16:10 342.613.995 2013-09-12 16:11 342.614.039 2013-09-12 16:15 342.614.291 2013-09-12 16:16 342.614.475 So it seems that ext4 counts the trims as writes? I don't know how I could get 300GB of writes on a 100GB partition -- of which only 8 GB are occupied -- otherwise. My smart values for my SSD are: SMART Attributes Data Structure revision number: 1 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x0003 100 100 070 Pre-fail Always - 0 5 Reallocated_Sector_Ct 0x0003 100 100 000 Pre-fail Always - 0 9 Power_On_Hours 0x0002 100 100 000 Old_age Always - 23 12 Power_Cycle_Count 0x0002 100 100 000 Old_age Always - 37 177 Wear_Leveling_Count 0x0003 100 100 000 Pre-fail Always - 465 178 Used_Rsvd_Blk_Cnt_Chip 0x0003 100 100 000 Pre-fail Always - 0 181 Program_Fail_Cnt_Total 0x0003 100 100 000 Pre-fail Always - 0 182 Erase_Fail_Count_Total 0x0003 100 100 000 Pre-fail Always - 0 187 Reported_Uncorrect 0x0002 100 100 000 Old_age Always - 0 192 Power-Off_Retract_Count 0x0003 100 100 000 Pre-fail Always - 7 196 Reallocated_Event_Count 0x0003 100 100 000 Pre-fail Always - 0 198 Offline_Uncorrectable 0x0003 100 100 000 Pre-fail Always - 0 199 UDMA_CRC_Error_Count 0x0003 100 100 000 Pre-fail Always - 0 232 Available_Reservd_Space 0x0003 100 100 010 Pre-fail Always - 0 241 Total_LBAs_Written 0x0003 100 100 000 Pre-fail Always - 1494 242 Total_LBAs_Read 0x0003 100 100 000 Pre-fail Always - 1308 Do those still look OK? Please help, I don't know what happens here. -- Julian Andres Klode - Debian Developer, Ubuntu Member See http://wiki.debian.org/JulianAndresKlode and http://jak-linux.org/.
Attachment:
pgpDlxrtZtRsx.pgp
Description: PGP signature
