On Sun, Nov 5, 2023 at 3:37 AM Roberto Ragusa <m...@robertoragusa.it> wrote: > > On 11/4/23 23:48, Javier Perez wrote: > > Hi. > > My boot SSD was purchased on May, 2015. > > It is a Crucial 128GB one. > > It looks like this has been working for 8 years continuously: > > > 9 Power_On_Hours 0x0032 100 100 000 Old_age Always > - 74107 > > $ date --date "now - 74107 hours" > Sat May 23 04:18:56 PM CEST 2015 > > and completely rewritten about 100 times: > > > 246 Total_LBAs_Written 0x0032 100 100 000 Old_age Always > - 23588083829 > > $ calc > C-style arbitrary precision calculator (version 2.14.0.14) > Calc is open software. For license details type: help copyright > [Type "exit" to exit, or "help" for help.] > > ; 23588083829*512/128e9 > 94.352335316 > > but it is not showing signs of failures: > > > 171 Program_Fail_Count 0x0032 100 100 000 Old_age Always > - 0 > > 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always > - 0 > > 196 Reallocated_Event_Count 0x0032 100 100 000 Old_age Always > - 16 > > 197 Current_Pending_ECC_Cnt 0x0032 100 100 000 Old_age Always > - 0 > > 198 Offline_Uncorrectable 0x0030 100 100 000 Old_age Offline > - 0 > > The only strange thing is this: > > > 202 Percent_Lifetime_Remain 0x0031 097 097 000 Pre-fail Offline > - 3 > > which SHOULD mean that it has 3% of life time left. > But I would not trust this parameter too much, there have been bugs in how > it is reported. In particular, the SMART threshold is 0 and the current > value is 97, which, in SMART world means that 97 has to go down to 0 > to indicate a problem. So maybe the disk has spent 3% of its life, not 97% > (100 rewrites are nothing, SLC are typically rated at 100,000) > > Given all this, I would not throw away the SSD.It has proven to be reliable > for almost 10 years, > it is probably a very robust SLC flash, not common nowadays. > Sure, it is only 128GB, so a replacement would be very cheap, > but I think it may continue in its job. > Pairing it with another young SSD in RAID1 would be the best option, > or at least have some backups of data (you should always have). >
Note what he said. the % lifetime is unreliable. I have a disk (I have it mirrored with another one). That went 0 - 100 (failing now), then spend 7-8 months at 100% FAILING_NOW, then dropped down to 78% and after 7 months back to 100% and stayed at 100% for 3 months, and then down to 29% and is currently 63%. I write about 50% of the size of the SSD each night and my disk registered "FAILING NOW" 3 years ago. I do not appear to have yet got any blocks on the ssd that have failed erase/rewrite, so since I have it mirrored I am going to keep running it and see how long it really lasts. _______________________________________________ users mailing list -- users@lists.fedoraproject.org To unsubscribe send an email to users-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/users@lists.fedoraproject.org Do not reply to spam, report it: https://pagure.io/fedora-infrastructure/new_issue
