Am Tue, 12 Dec 2017 10:52:27 -0800 (PST) "Rodney W. Grimes" <freebsd-rwg_at_pdx.rh.CN85.dnsmgr.net> schrieb: Thank you for answering that fast! > > Hello, > > > > running CURRENT (recent r326769), I realised that smartmond sends out some console > > messages when booting the box: > > > > [...] > > Dec 12 14:14:33 <3.2> box1 smartd[68426]: Device: /dev/ada6, 1 Currently unreadable > > (pending) sectors Dec 12 14:14:33 <3.2> box1 smartd[68426]: Device: /dev/ada6, 1 > > Offline uncorrectable sectors > > [...] > > > > Checking the drive's SMART log with smartctl (it is one of four 3TB disk drives), I > > gather these informations: > > > > [... smartctl -x /dev/ada6 ...] > > Error 42 [17] occurred at disk power-on lifetime: 25335 hours (1055 days + 15 hours) > > When the command that caused the error occurred, the device was active or idle. > > > > After command completion occurred, registers were: > > ER -- ST COUNT LBA_48 LH LM LL DV DC > > -- -- -- == -- == == == -- -- -- -- -- > > 40 -- 51 00 00 00 00 c2 7a 72 98 40 00 Error: UNC at LBA = 0xc27a7298 = 3262804632 > > > > Commands leading to the command that caused the error were: > > CR FEATR COUNT LBA_48 LH LM LL DV DC Powered_Up_Time Command/Feature_Name > > -- == -- == -- == == == -- -- -- -- -- --------------- -------------------- > > 60 00 b0 00 88 00 00 c2 7a 73 20 40 08 23:38:12.195 READ FPDMA QUEUED > > 60 00 b0 00 80 00 00 c2 7a 72 70 40 08 23:38:12.195 READ FPDMA QUEUED > > 2f 00 00 00 01 00 00 00 00 00 10 40 08 23:38:12.195 READ LOG EXT > > 60 00 b0 00 70 00 00 c2 7a 73 20 40 08 23:38:09.343 READ FPDMA QUEUED > > 60 00 b0 00 68 00 00 c2 7a 72 70 40 08 23:38:09.343 READ FPDMA QUEUED > > [...] > > > > and > > > > [...] > > SMART Attributes Data Structure revision number: 16 > > Vendor Specific SMART Attributes with Thresholds: > > ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE > > 1 Raw_Read_Error_Rate POSR-K 200 200 051 - 64 > > 3 Spin_Up_Time POS--K 178 170 021 - 6075 > > 4 Start_Stop_Count -O--CK 098 098 000 - 2406 > > 5 Reallocated_Sector_Ct PO--CK 200 200 140 - 0 > > 7 Seek_Error_Rate -OSR-K 200 200 000 - 0 > > 9 Power_On_Hours -O--CK 066 066 000 - 25339 > > 10 Spin_Retry_Count -O--CK 100 100 000 - 0 > > 11 Calibration_Retry_Count -O--CK 100 100 000 - 0 > > 12 Power_Cycle_Count -O--CK 098 098 000 - 2404 > > 192 Power-Off_Retract_Count -O--CK 200 200 000 - 154 > > 193 Load_Cycle_Count -O--CK 001 001 000 - 2055746 > > 194 Temperature_Celsius -O---K 122 109 000 - 28 > > 196 Reallocated_Event_Count -O--CK 200 200 000 - 0 > > 197 Current_Pending_Sector -O--CK 200 200 000 - 1 > > 198 Offline_Uncorrectable ----CK 200 200 000 - 1 > > 199 UDMA_CRC_Error_Count -O--CK 200 200 000 - 0 > > 200 Multi_Zone_Error_Rate ---R-- 200 200 000 - 5 > > ||||||_ K auto-keep > > |||||__ C event count > > ||||___ R error rate > > |||____ S speed/performance > > ||_____ O updated online > > |______ P prefailure warning > > > > [...] > > The data up to this point informs us that you have 1 bad sector > on a 3TB drive, that is actually an expected event given the data > error rate on this stuff is such that your gona have these now > and again. > > Given you have 1 single event I would not suspect that this drive > is dying, but it would be prudent to prepare for that possibility. Hello. Well, I copied simply "one single event" that has been logged so far. As you (and I) can see, it is error #42. After I posted here, a reboot has taken place because the "repair" process on the Pool suddenly increased time and now I'm with error #47, but interestingly, it is a new block that is damaged, but the SMART attribute fields show this for now: [...] SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAGS VALUE WORST THRESH FAIL RAW_VALUE 1 Raw_Read_Error_Rate POSR-K 200 200 051 - 69 3 Spin_Up_Time POS--K 178 170 021 - 6075 4 Start_Stop_Count -O--CK 098 098 000 - 2406 5 Reallocated_Sector_Ct PO--CK 200 200 140 - 0 7 Seek_Error_Rate -OSR-K 200 200 000 - 0 9 Power_On_Hours -O--CK 066 066 000 - 25343 10 Spin_Retry_Count -O--CK 100 100 000 - 0 11 Calibration_Retry_Count -O--CK 100 100 000 - 0 12 Power_Cycle_Count -O--CK 098 098 000 - 2404 192 Power-Off_Retract_Count -O--CK 200 200 000 - 154 193 Load_Cycle_Count -O--CK 001 001 000 - 2055746 194 Temperature_Celsius -O---K 122 109 000 - 28 196 Reallocated_Event_Count -O--CK 200 200 000 - 0 197 Current_Pending_Sector -O--CK 200 200 000 - 0 198 Offline_Uncorrectable ----CK 200 200 000 - 1 199 UDMA_CRC_Error_Count -O--CK 200 200 000 - 0 200 Multi_Zone_Error_Rate ---R-- 200 200 000 - 5 ||||||_ K auto-keep |||||__ C event count ||||___ R error rate |||____ S speed/performance ||_____ O updated online |______ P prefailure warning [...] 197 Current_Pending_Sector decreased to zero so far, but with every reboot, the error count seems to increase: [...] Error 47 [22] occurred at disk power-on lifetime: 25343 hours (1055 days + 23 hours) When the command that caused the error occurred, the device was active or idle. After command completion occurred, registers were: ER -- ST COUNT LBA_48 LH LM LL DV DC -- -- -- == -- == == == -- -- -- -- -- 40 -- 51 00 00 00 00 c2 19 d9 88 40 00 Error: UNC at LBA = 0xc219d988 = 3256473992 Commands leading to the command that caused the error were: CR FEATR COUNT LBA_48 LH LM LL DV DC Powered_Up_Time Command/Feature_Name -- == -- == -- == == == -- -- -- -- -- --------------- -------------------- 60 00 b0 00 d0 00 00 c2 19 da 28 40 08 1d+07:12:34.336 READ FPDMA QUEUED 60 00 b0 00 c8 00 00 c2 19 d9 78 40 08 1d+07:12:34.336 READ FPDMA QUEUED 2f 00 00 00 01 00 00 00 00 00 10 40 08 1d+07:12:34.336 READ LOG EXT 60 00 b0 00 b8 00 00 c2 19 da 28 40 08 1d+07:12:31.484 READ FPDMA QUEUED 60 00 b0 00 b0 00 00 c2 19 d9 78 40 08 1d+07:12:31.483 READ FPDMA QUEUED I think this is watching a HDD dying, isn't it? I'd say, a broken cabling would produce different errors, wouldn't it? The Western Digital Green series HDD is a useful fellow when the HDD is used as a single drive. I think there might be an issue with paring 4 HDDs, 3 of them "GREEN", in a RAIDZ and physically sitting next to each other. Maybe it is time to replace them one by one ... > > > > > > The ZFS pool is RAIDZ1, comprised of 3 WD Green 3TB HDD and one WD RED 3 TB HDD. The > > failure occured is on one of the WD Green 3 TB HDD. > Ok, so the data is redundantly protected. This helps a lot. > > > The pool is marked as "resilvered" - I do scrubbing on a regular basis and the > > "resilvering" message has now aapeared the second time in row. Searching the net > > recommend on SMART attribute 197 errors, in my case it is one, and in combination with > > the problems occured that I should replace the disk. > > It is probably putting the RAIDZ in that state as the scrub is finding a block > it can not read. > > > > > Well, here comes the problem. The box is comprised from "electronical waste" made by > > ASRock - it is a Socket 1150/IvyBridge board, which has its last Firmware/BIOS update > > got in 2013 and since then UEFI booting FreeBSD from a HDD isn't possible (just to > > indicate that I'm aware of having issues with crap, but that is some other issue > > right now). The board's SATA connectors are all populated. > > > > So: Due to the lack of adequate backup space I can only selectively backup portions, > > most of the space is occupied by scientific modelling data, which I had worked on. So > > backup exists! In one way or the other. My concern is how to replace the faulty HDD! > > Most HowTo's indicate a replacement disk being prepared and then "replaced" via ZFS's > > replace command. This isn't applicable here. > > > > Question: is it possible to simply pull the faulty disk (implies I know exactly which > > one to pull!) and then prepare and add the replacement HDD and let the system do its > > job resilvering the pool? > > That may work, but I think I have a simpler solution. > > > > > Next question is: I'm about to replace the 3 TB HDD with a more recent and modern 4 TB > > HDD (WD RED 4TB). I'm aware of the fact that I can only use 3 TB as the other disks > > are 3 TB, but I'd like to know whether FreeBSD's ZFS is capable of handling it? > > Someone else? > > > > > This is the first time I have issues with ZFS and a faulty drive, so if some of my > > questions sound naive, please forgive me. > > One thing to try is to see if we can get the drive to fix itself, first order > of business is can you take this server out of service? If so I would > simply try to do a > repeat 100 dd if=/dev/whicheverhdisbad of=/dev/null conv=noerror, sync iseek=3262804632 > > That is trying to read that block 100 times, if it successful even 1 time > smart should remap the block and you are all done. Given the fact, that this errorneous block is like a moving target, it this solution still the favorite one? I'll try, but I already have the replacement 4 TB HDD at hand. > > If that fails we can try to zero the block, there is a risk here, but raidz should just > handle this as a data corruption of a block. This could possibly lead to data loss, > so USE AT YOUR OWN RISK ASSESMENT. > dd if=/dev/zero of=/dev/whateverdrivehasissues bs=512 count=1 oseek=3262804632 I would then be oseek=3256473992, too. > > That should forceable overwrite the bad block with 0's, the smart firmware > well see this in the pending list, write the data, read it back, if successful > remove it from the pending list, if failed reallocate the block and write > the 0's to the reallocation and add 1 to the remapped block count. > > You might google for "how to fix a pending reallocation" > > > Thanks in advance, > > Oliver > > -- > > O. Hartmann > Kind regards, Oliver -- O. Hartmann Ich widerspreche der Nutzung oder Übermittlung meiner Daten für Werbezwecke oder für die Markt- oder Meinungsforschung (§ 28 Abs. 4 BDSG).
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