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Q: how to re-assemble RAID5 array
After some stupid action (described here) I lost a RAID5 volume (4 x 6TB, OS 4.2.27). The partitions vanished from the partition table. No warranty, no backup. It would be nice (though not essential)...
You could try forcing the array online but you may wish to clone your disks first. If you coyountact support you could purchase a data recovery attempt where support would attempt to recover your data.
What is the SMART stats of your disks like?
Edit: Oops. I confused the creation time with the update time.
I guess the SMART stats are OK, the disks have been 'on power' for only about 300 hours (bought them in the beginning of August). Last time I looked at SMART data (via OS6 interface) was around 170 hours, no errors then.
How would I force the array online?
Data recovery by Netgear is not an option I guess (fiddled aroud too much (OS4<->OS6), plus the Pro they were in was not bought new).
Next to that, the data is not that valuable (missing it would be an inconvenience, but not a real problem).
I don't have the spare space to clone about 16 TB. And my girlfriend won't make me live to the end of the weekend if I spend another 1000 EURO's for new disks ... :smileyfrustrated:
So I'll take the chances losing the data.
The disks are now in a Pro6 running Knoppix.
The requested output:
root@Microknoppix:/home/knoppix# cat /proc/partitions major minor #blocks name 240 0 10559232 cloop0 252 0 2259732 zram0 8 0 5860522584 sda 8 1 4193272 sda1 8 2 524228 sda2 8 3 5855800708 sda3 8 16 5860522584 sdb 8 17 4193272 sdb1 8 18 524228 sdb2 8 19 5855800708 sdb3 8 32 5860522584 sdc 8 33 4193272 sdc1 8 34 524228 sdc2 8 35 5855800708 sdc3 8 48 5860522584 sdd 8 49 4193272 sdd1 8 50 524228 sdd2 8 51 5855800708 sdd3 8 80 122368 sdf 8 81 122250 sdf1 8 64 7566624 sde 8 65 4556800 sde1 8 66 3008512 sde2
sda,b,c,d are HDD's,
sde is Knoppix pendrive
sdf is internal flash (I presume)
root@Microknoppix:/home/knoppix# for i in /dev/sd[a-z]; do echo $i; smartctl -a $i | egrep "Model|Firm|Sector|Hours|Error|Uncorr"; done;
/dev/sda
Device Model: WDC WD60EFRX-68MYMN1
Firmware Version: 82.00A82
Sector Sizes: 512 bytes logical, 4096 bytes physical
Error logging capability: (0x01) Error logging supported.
SCT Error Recovery Control supported.
1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 100 253 000 Old_age Always - 0
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 288
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0
SMART Error Log Version: 1
No Errors Logged
/dev/sdb
Device Model: WDC WD60EFRX-68MYMN1
Firmware Version: 82.00A82
Sector Sizes: 512 bytes logical, 4096 bytes physical
Error logging capability: (0x01) Error logging supported.
SCT Error Recovery Control supported.
1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 100 253 000 Old_age Always - 0
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 288
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0
SMART Error Log Version: 1
No Errors Logged
/dev/sdc
Device Model: WDC WD60EFRX-68MYMN1
Firmware Version: 82.00A82
Sector Sizes: 512 bytes logical, 4096 bytes physical
Error logging capability: (0x01) Error logging supported.
SCT Error Recovery Control supported.
1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 100 253 000 Old_age Always - 0
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 288
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0
SMART Error Log Version: 1
No Errors Logged
/dev/sdd
Device Model: WDC WD60EFRX-68MYMN1
Firmware Version: 82.00A82
Sector Sizes: 512 bytes logical, 4096 bytes physical
Error logging capability: (0x01) Error logging supported.
SCT Error Recovery Control supported.
1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0
5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0
7 Seek_Error_Rate 0x002e 200 200 000 Old_age Always - 0
9 Power_On_Hours 0x0032 100 100 000 Old_age Always - 294
197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0030 100 253 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0
200 Multi_Zone_Error_Rate 0x0008 100 253 000 Old_age Offline - 0
SMART Error Log Version: 1
No Errors Logged
/dev/sde
/dev/sdf
/dev/sdg
/dev/sdh
If it is OS6 then it would be /dev/md127 not /dev/md2
Does it make any difference if you try to assemble md127 rather than md2?Best to leave forcing it online as a last resort.
No difference, unfortunately...:
root@Microknoppix:/home/knoppix# mdadm --assemble /dev/md127 --verbose /dev/sd[abcd]3 mdadm: looking for devices for /dev/md127 mdadm: /dev/sda3 is identified as a member of /dev/md127, slot 0. mdadm: /dev/sdb3 is identified as a member of /dev/md127, slot 1. mdadm: /dev/sdc3 is identified as a member of /dev/md127, slot 2. mdadm: /dev/sdd3 is identified as a member of /dev/md127, slot 3. mdadm: failed to add /dev/sdb3 to /dev/md127: Invalid argument mdadm: failed to add /dev/sdc3 to /dev/md127: Invalid argument mdadm: failed to add /dev/sdd3 to /dev/md127: Invalid argument mdadm: failed to add /dev/sda3 to /dev/md127: Invalid argument mdadm: /dev/md127 assembled from 0 drives - need all 4 to start it (use --run to insist).
The array was created with OS4, but there was the stupidity with the switching as described in the post I referenced in the TS, which caused parts of OS6 landing on the OS4 partition.
Therefore I'd rather not put it back on Readynas OS (4 / 6), because I don't trust what drama will happen (and it probably won't boot anyway).
Bur the array was created in OS4.
In addition, I ran a SMART extended offline test last night (took about 12 hours) on all 4 drives. No errors reported whatsoever.
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