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Bad slot contact leads to drive marked as "failed"?
05-03-2017, 03:59 AM (This post was last modified: 05-03-2017 04:34 AM by PosNunoCorreia.)
Post: #1
Bad slot contact leads to drive marked as "failed"?
I think one of the slots on a 5N is misbehaving, had a (supposed) drive failure last October on a WD Green 3TB, the first one in 4 years, and promptly switched it to a Seagate Archive 6 TB as I've been wanting to upgrade it anyway.

Soon after, maybe a couple of weeks, Drobo reported a drive missing on that slot like it was empty, I turned Drobo off and re-seated the disk and all was fine, but then there was a warning on Dashboard for that Seagate drive.

As far as I remember it might have happened once more, but I'm not sure. Yesterday Drobo reported that drive as "failed", its under the warranty and will probably be swapped but I'm starting to believe there's a "contact" problem with that Drobo slot so I decided to run a smartcl scan on the whole drive (long test).

I put the drive on a external thunderbolt dock, and run the long test (13h): no errors what so ever.I'm not an expert on the subject but as far as I can read SMART log comes clean, supposedly the drive never had an error (smartcl output below). I dont know what to make of this and the reasons why Drobo has marked it as Failed drive, could it be because power to the drive was interrupted for (maybe) 3 times?
After the SMART scans I tried to put it back on Drobo to no avail, it still shows as Red/Failed drive.

The vendor of the drive said the drive would be tested to check for errors before they would replace it, I suspect it will come clean and If I just swap it for a new one (paying a new one) same thing will happen again.

Also, Ive read somewhere in Drobo Knowledge Base you can store all Drobo disks away and put it back later (the whole pack, not individual), does this mean I can switch the order on the Drobo disks?

I was thinking in maybe replacing the (supposed) failed drive and after Drobo rebuild the data switch one of the smaller (3TB) of the array for the 6TB on that slot as If it happens again I have spare 3TB drives and its cheaper to deal with.

Any sugestions?
Ty in advance.


Quote:smartctl 6.5 2016-05-07 r4318 [Darwin 16.5.0 x86_64] (local build)
Copyright © 2002-16, Bruce Allen, Christian Franke, http://www.smartmontools.org

=== START OF INFORMATION SECTION ===
Model Family: Seagate Archive HDD
Device Model: ST6000AS0002-1N917X
Serial Number: Z840L6SH
LU WWN Device Id: 5 000c50 09184579b
Firmware Version: AR17
User Capacity: 6,001,175,126,016 bytes [6.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5980 rpm
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-2, ACS-3 T13/2161-D revision 3b
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Wed May 3 10:22:45 2017 WEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

General SMART Values:
Offline data collection status: (0x82) Offline data collection activity
was completed without error.
Auto Offline Data Collection: Enabled.
Self-test execution status: ( 0) The previous self-test routine completed
without error or no self-test has ever
been run.
Total time to complete Offline
data collection: ( 0) seconds.
Offline data collection
capabilities: (0x7b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
Short self-test routine
recommended polling time: ( 1) minutes.
Extended self-test routine
recommended polling time: ( 737) minutes.
Conveyance self-test routine
recommended polling time: ( 2) minutes.
SCT capabilities: (0x30b5) SCT Status supported.
SCT Feature Control supported.
SCT Data Table supported.

SMART Attributes Data Structure revision number: 10
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE
1 Raw_Read_Error_Rate 0x000f 117 099 006 Pre-fail Always - 132364800
3 Spin_Up_Time 0x0003 094 090 000 Pre-fail Always - 0
4 Start_Stop_Count 0x0032 100 100 020 Old_age Always - 185
5 Reallocated_Sector_Ct 0x0033 100 100 010 Pre-fail Always - 0
7 Seek_Error_Rate 0x000f 076 060 030 Pre-fail Always - 4337718688
9 Power_On_Hours 0x0032 099 099 000 Old_age Always - 1089
10 Spin_Retry_Count 0x0013 100 100 097 Pre-fail Always - 0
12 Power_Cycle_Count 0x0032 100 100 020 Old_age Always - 133
183 Runtime_Bad_Block 0x0032 100 100 000 Old_age Always - 0
184 End-to-End_Error 0x0032 100 100 099 Old_age Always - 0
187 Reported_Uncorrect 0x0032 100 100 000 Old_age Always - 0
188 Command_Timeout 0x0032 100 100 000 Old_age Always - 0
189 High_Fly_Writes 0x003a 100 100 000 Old_age Always - 0
190 Airflow_Temperature_Cel 0x0022 061 054 045 Old_age Always - 39 (Min/Max 28/46)
191 G-Sense_Error_Rate 0x0032 100 100 000 Old_age Always - 0
192 Power-Off_Retract_Count 0x0032 100 100 000 Old_age Always - 192
193 Load_Cycle_Count 0x0032 100 100 000 Old_age Always - 286
194 Temperature_Celsius 0x0022 039 046 000 Old_age Always - 39 (0 17 0 0 0)
195 Hardware_ECC_Recovered 0x001a 117 099 000 Old_age Always - 132364800
197 Current_Pending_Sector 0x0012 100 100 000 Old_age Always - 0
198 Offline_Uncorrectable 0x0010 100 100 000 Old_age Offline - 0
199 UDMA_CRC_Error_Count 0x003e 200 200 000 Old_age Always - 0
240 Head_Flying_Hours 0x0000 100 253 000 Old_age Offline - 935 (135 176 0)
241 Total_LBAs_Written 0x0000 100 253 000 Old_age Offline - 14683731508
242 Total_LBAs_Read 0x0000 100 253 000 Old_age Offline - 18402608447

SMART Error Log Version: 1
No Errors Logged

SMART Self-test log structure revision number 1
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Extended offline Completed without error 00% 1084 -
# 2 Short offline Completed without error 00% 1072 -
# 3 Extended offline Interrupted (host reset) 00% 1070 -
# 4 Short offline Completed without error 00% 1069 -

SMART Selective self-test log data structure revision number 1
SPAN MIN_LBA MAX_LBA CURRENT_TEST_STATUS
1 0 0 Not_testing
2 0 0 Not_testing
3 0 0 Not_testing
4 0 0 Not_testing
5 0 0 Not_testing
Selective self-test flags (0x0):
After scanning selected spans, do NOT read-scan remainder of disk.
If Selective self-test is pending on power-up, resume after 0 minute delay.

EDIT:
Table here as JPEG for easier reading:

[Image: Nxy3kG0.jpg]
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05-03-2017, 02:25 PM
Post: #2
RE: Bad slot contact leads to drive marked as "failed"?
hi can i check if that is a seagate archive SMR drive?
if it is using smr, those drives have not been recommended for use in a nas or 5n due to the way the smr drives process data internally, for example as mentioned here:
https://myproducts.drobo.com/article/AA-01124
(while it is still possible that the slot has a problem, this archive feature could be the main reason for it in this case)


from what you mentioned earlier, it seems that the first failure you had with the WD Green 3TB, was an actual failure (though can i check if it had failed with a flashing red light for that wd green 3TB drive?)... if that was the case, i think it would be worth trying another blank/un-needed, non-archive/non-smr drive, in the same slot as the original WD Green 3TB, but of at least 3TB in size, and it should hopefully accept the drive into the diskpack and shortly after start juggling the data around with a relayout.

for disk packs, you essentially can move and store diskpacks in their entirety for the future, though only when power is all off and cables unplugged, though more info about it can be found here:
https://myproducts.drobo.com/article/AA-01761
&
https://myproducts.drobo.com/article/AA-01707

(btw i have XP home SP2, a Drobo v1 with 2x 1TB/2x 1.5TB WD greens, & a bkp Drobo v2 with the same + a DroboShare: unused)
& a DroboS v2 with 3xWD15EADS &2x1TB in DDR mode on win7, & a drobo5D (all usb)
  • btw i did a sustained (write) operation for about 6 hours, and got 13.2MB / sec ...objection? "sustained" :)
    (16.7MB/s on a v2 & 47-96MB/s drobo-s)
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05-04-2017, 05:02 AM (This post was last modified: 05-04-2017 05:04 AM by PosNunoCorreia.)
Post: #3
RE: Bad slot contact leads to drive marked as "failed"?
Hi Paul,

ty for the answer and explanation, I wasn't really aware of what SMR was or being unsupported.

I'm not entirely sure if the first drive failure (3TB Green) was indeed a failure, I just assumed back then when Drobo marked it as failed so I formatted it with a zero pass (to signal bad blocks) and have used it for temporary storage of unimportant stuff.

From Seagate PDFs I can really confirm this 6TB Archive is indeed a SMR drive, looks like all Archive ones are, will try to swap it for a WD RED 6TB as those seem to be "SMR free" and NAS/RAID optimized,those are even cheaper atm here but were unavailable (out of stock) when I needed.

As for diskpacks: from what your saying I'm assuming that after rebuild one can safely switch drives order/slots with the Drobo powered down, correct?

Ty
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05-05-2017, 06:47 PM
Post: #4
RE: Bad slot contact leads to drive marked as "failed"?
thanks for the clarifications, yes a wd red should be ok,

what you mentioned about diskpacks is ok... after the rebuild if the drobo is in a stable state (ideally with all drive lights solid green) you could shut down the drobo and remove all cables from it, and with power all off and cables unplugged, can swap drive positions... i would only do that with 2 drives swapping positions at a time though, just to play safer) Smile

(btw i have XP home SP2, a Drobo v1 with 2x 1TB/2x 1.5TB WD greens, & a bkp Drobo v2 with the same + a DroboShare: unused)
& a DroboS v2 with 3xWD15EADS &2x1TB in DDR mode on win7, & a drobo5D (all usb)
  • btw i did a sustained (write) operation for about 6 hours, and got 13.2MB / sec ...objection? "sustained" :)
    (16.7MB/s on a v2 & 47-96MB/s drobo-s)
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05-08-2017, 04:47 AM
Post: #5
RE: Bad slot contact leads to drive marked as "failed"?
Ty for the help Paul,

So I did swap the 6TB Seagate Archive (failed?) drive for a WD RED 6TB, the rebuild when smoothly, don't really know how much time it took because I left it unattended during weekend.

After that: shut down Drobo, removed cables and proceeded to switch slot drives, the WD RED 6TB is now on another slot and moved one of the 3TB already in diskpack to the suspected slot.Powered on and everything is fine, all green lights across the board.What a relief...

Now I have 6TB+3TB+3TB+4TB+6TB. I dont feel like increasing the size of this Drobo much more, because this diskpack was made on older firmware I have the 16TB limitation.

I was thinking if this happens again in the same slot, I would replace the two 3TB drives with a single 6TB and leave the slot unoccupied.
From what I have read, the procedure is fairly simple:

1. Replace on 3TB for the 6TB
2. Wait for rebuild
3. Remove the other 3TB drive.
4.Wait for rebuild. Done.
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05-08-2017, 04:39 PM
Post: #6
RE: Bad slot contact leads to drive marked as "failed"?
thanks for the update and the good news about your drobo Smile

if you end up coming to the stage where you would like to try those 4 steps, they seem ok at the moment, though step 4 might not actually take place unless you have only about 84% of the drobo used, though if you find your self in this situation and want to plan out some steps, please feel free to make another post, and one of the folks here can offer some hints and tips.... possibly me (unless im eating lots of cakes and desserts at the time) Big Grin

(btw i have XP home SP2, a Drobo v1 with 2x 1TB/2x 1.5TB WD greens, & a bkp Drobo v2 with the same + a DroboShare: unused)
& a DroboS v2 with 3xWD15EADS &2x1TB in DDR mode on win7, & a drobo5D (all usb)
  • btw i did a sustained (write) operation for about 6 hours, and got 13.2MB / sec ...objection? "sustained" :)
    (16.7MB/s on a v2 & 47-96MB/s drobo-s)
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