Hi Terry, > > http://hadrian-way.co.uk/Misc/
https://en.wikipedia.org/wiki/S.M.A.R.T%2E is good background and has as table. > 9 Power_On_Hours -O--CK 092 092 000 - 6039 That's not very long. $ units 6039hours time 251 day + 15 hr > 12 Power_Cycle_Count -O--CK 100 100 000 - 598 > 193 Load_Cycle_Count -O--CK 199 199 000 - 4681 Doesn't look too unreasonable. $ units 6039hours/598 time 10 hr + 5 min + 55.183946 sec $ units 6039hours/4681 time 1 hr + 17 min + 24.392224 sec > 5 Reallocated_Sector_Ct PO--CK 200 200 140 - 0 The drive has never remapped one sector it found hard to read to another. That's good, but... > 196 Reallocated_Event_Count -O--CK 198 198 000 - 2 Two attempts, successful or not, to remap a sector. > 197 Current_Pending_Sector -O--CK 199 199 000 - 310 310 sectors that haven't yet been read successfully. If that's achieved, e.g. ddrescue(1), or the sector is written, e.g. having badblocks write to the device if you don't care for the drive's data, then it can be remapped. > 198 Offline_Uncorrectable ----CK 199 199 000 - 294 294 read or write errors that couldn't be corrected, e.g. ECC. > 199 UDMA_CRC_Error_Count -O--CK 200 200 000 - 0 No interface CRC errors detected. > 200 Multi_Zone_Error_Rate ---R-- 197 197 051 - 434 434 write errors. Changes in these numbers over time and usage give an indication of if it's degrading and how quickly. That's why I log them daily. > Error 1063 [6] 6028 hours (251 days + 4 hours) UNC at LBA = > 0x0352f58c = 55768460 > Error 1062 [5] 6028 hours (251 days + 4 hours) UNC 8 sectors at LBA = > 0x0352e5f8 = 55764472 > Error 1061 [4] 6028 hours (251 days + 4 hours) UNC at LBA = > 0x0352e5fd = 55764477 > Error 1060 [3] 6028 hours (251 days + 4 hours) UNC 8 sectors at LBA = > 0x0352e5f8 = 55764472 > Error 1059 [2] 6028 hours (251 days + 4 hours) UNC at LBA = > 0x0352e5fd = 55764477 > Error 1058 [1] 6028 hours (251 days + 4 hours) UNC 8 sectors at LBA = > 0x0352cdf8 = 55758328 > Error 1057 [0] 6028 hours (251 days + 4 hours) UNC at LBA = > 0x0352cdff = 55758335 > Error 1056 [23] 6028 hours (251 days + 4 hours) UNC 8 sectors at LBA = > 0x0352cdf8 = 55758328 These uncorrectables are probably your badblocks reading every sector. The few errors still in the SMART logs are close together on disk. > I came across a bug posted about three years ago about smartctl > throwing up false read errors Do you mean badblocks? > > > We won't need all of the 1 TB of space for our purposes, so could > > > we partition the least bad part of the disc and use it? > > > > If the errors are constrained to a clear part to avoid. > > There were just over 1000 badblocks reported, so not a huge amount in > comparison to a 1 TB drive. It depends how scattered through the disk they are. But really, push the problem down to the drive. Allow it to reallocate those sectors it knows are duff but writing to them; easy if the drive's contents are worthless by employing badblocks' destructive write test. Then the SMART data should show lots of reallocations and the drive won't have any uncorrectable sectors, for a while, so your partitions don't have anywhere to avoid. > I presume it would try to mirror the whole thing, since that is what > is would expect to do. But this is a ‘new’ drive being added to the existing one to make an array so it will be the destination of the mirroring and have lots written to it? It's only the reading of it, e.g. a regular ‘scrub’ that will show problems. -- Cheers, Ralph. -- Next meeting: BEC, Bournemouth, Tuesday, 2019-07-02 20:00 Check to whom you are replying Meetings, mailing list, IRC, ... http://dorset.lug.org.uk/ New thread, don't hijack: mailto:dorset@mailman.lug.org.uk
