Thank you for this very detailed answer !
After a reboot of the machine, I have no more write errors on disk 2 (only
4 checksum, not growing), I was able to access data which I previously
couldn't and now only the checksum errors on disk 5 are growing.
Fortunately, I was able to recover all important data in those conditions
(yeah !),
Unfortunately, I don't have the spare disks to backup everything or try
your idea of copying every disk (very good strategy btw, I hadn't tought
about it !).
And since I can live with loosing the pool now, I'll gamble away and
replace drive 5 tomorrow and if that fails i'll just destroy the pool,
replace the 2 physical disks and build a new one (maybe raidz2 this time :))
I'll try to leave all 6 original disks in the machine while replacing,
maybe zfs will be smart enough to use the 6 drives to build the replacement
disk ?
It's a miracle that zpool still shows disk 5 as "ONLINE", here's a SMART
dump of disk 5 (1265 Current_Pending_Sector, ouch) :
=== START OF READ SMART DATA SECTION ===
SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED
WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x002f 178 173 051 Pre-fail Always
- 3804
3 Spin_Up_Time 0x0027 253 253 021 Pre-fail Always
- 1050
4 Start_Stop_Count 0x0032 100 100 000 Old_age Always
- 86
5 Reallocated_Sector_Ct 0x0033 198 198 140 Pre-fail Always
- 55
7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always
- 0
9 Power_On_Hours 0x0032 094 094 000 Old_age Always
- 4606
10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always
- 0
11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always
- 0
12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always
- 84
192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always
- 30
193 Load_Cycle_Count 0x0032 179 179 000 Old_age Always
- 65652
194 Temperature_Celsius 0x0022 119 109 000 Old_age Always
- 31
196 Reallocated_Event_Count 0x0032 145 145 000 Old_age Always
- 55
197 Current_Pending_Sector 0x0032 195 195 000 Old_age Always
- 1265
198 Offline_Uncorrectable 0x0030 200 189 000 Old_age Offline
- 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always
- 0
200 Multi_Zone_Error_Rate 0x0008 200 001 000 Old_age Offline
- 1
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