Hi Jérôme, Am Mittwoch, 13. März 2013 schrieb Jérôme Poulin: > On Tue, Mar 12, 2013 at 10:03 PM, Eric Sandeen <sandeen@xxxxxxxxxx> wrote: > > [ 37.176790] BTRFS error (device dm-0) in __btrfs_free_extent:5143: > > IO failure [ 37.176791] btrfs is forced readonly > > [ 37.176793] btrfs: run_one_delayed_ref returned -5 > > It seems the SSD has bad blocks now, BTRFS seems to abuse SSD disks, I > burnt 1 SSD disk and 2 USB flash drive since I'm using BTRFS, in about > 2 months for each. ddrescue'ing the SSD would probably give better > chances of recovery and give BTRFS/btrfsck a chance to write correctly > to the newly copied image. Well, the Intel SSD 320 in this ThinkPad T520 so far didn´t seem to notice any significant abuse due to BTRFS in use: smartctl-a-2013-03-14 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 5250 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 202408 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203778 Above value has always been in that range… according to a PDF from Intel the Media_Wearout_Indicator below is important. 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 202408 I have about 20 GB / on BTRFS since the beginning. Thats almost 2 years now. Now I also have 200GB /home on BTRFS, since a month or two. Granted this is more data, but unless proven by observed I/O patterns or so, I suggest being careful with suggestions that BTRFS abuses SSD disks out of just your own experience and suggest to ask it as a question in case you do not know for sure. According to my irregular data points I also see no significant increase in wear out after I switched BTRFS to /home although it is a bit premature to say for sure - I will continue to have a look at it: martin@merkaba:~/Computer/Merkaba/Intel SSD 320> for F in $(ls smartctl*) ; do echo "$F" | cut -c1-21 ; egrep "(Wear|Host_Writes|Erase_Fail_Count| Power_On_Hours)" "$F" ; done smartctl-a-2011-05-19 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 0 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 smartctl-a-2011-05-19 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 1 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 smartctl-a-2011-06-23 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 324 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 0 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 19158 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203342 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 19158 smartctl-a-2011-06-23 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 324 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 0 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 19158 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203342 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 19158 smartctl-a-2011-06-23 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 325 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 0 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 19160 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203342 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 19160 smartctl-a-2011-06-23 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 320 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 0 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 19041 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203342 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 19041 smartctl-a-2011-12-16 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 271 Mow thats funny. Intel SSD went back in time? From 325 to 271 power on hours in half year. I knew I had a time machine somewhere. I just forgot where it is. :) 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 First occurence with erase failures. But didn´t raise after then. No other error related occurences in other values so far :) 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 66757 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203450 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 66757 smartctl-a-2011-12-16 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 271 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 66759 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203450 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 66759 smartctl-a-2011-12-16 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 271 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 66757 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203450 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 66757 smartctl-a-2012-07-19 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 2444 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 128105 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 314 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 128105 smartctl-a-2012-07-19 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 2443 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 127984 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 314 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 127984 smartctl-a-2012-07-30 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 2582 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 131072 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203604 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 131072 smartctl-a-2012-12-02 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 4023 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 170107 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203703 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 170107 smartctl-a-2013-02-22 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 5010 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 198165 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203768 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 198165 smartctl-a-2013-02-22 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 5010 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 198163 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203768 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 198163 smartctl-a-2013-03-14 9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 5250 172 Erase_Fail_Count 0x0032 100 100 000 Old_age Always - 169 225 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 202408 226 Workld_Media_Wear_Indic 0x0032 100 100 000 Old_age Always - 2203778 233 Media_Wearout_Indicator 0x0032 100 100 000 Old_age Always - 0 241 Host_Writes_32MiB 0x0032 100 100 000 Old_age Always - 202408 More than one data point on one day, is before and after self tests. Basically the wear out related values didn´t change much at all. The indicicative Media_Wearout_Indicitor didn´t change at all. I leave about 20 GB of the 300 GB free at most times, according to a paper from Intel this helps long time performance and from my understanding of SSD workings it also helps long evity. Thanks, -- Martin 'Helios' Steigerwald - http://www.Lichtvoll.de GPG: 03B0 0D6C 0040 0710 4AFA B82F 991B EAAC A599 84C7 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
