SMART Current_Pending_Sector warning - What to do?

[clickclick]

I just got a SMART warning on one of my drives, specifically around the Current_Pending_Sector count. I've also done a SMART Complete Scan and got the same result. I can't seem to find any option to do additional scans or fix the problem.

My questions are:
I see in another thread that the advice is to HOT SWAP the faulty drive for a new one. Is that the best/only option I have?
Is this something that can be fixed?

Thanks in advance for the help!


Basic info below:
Operating System: Mac OS X 10.10.4
NAS model: TS-419P+
Firmware: 4.1.4 Build 20150522
Network: Single port

Drive Configuration: RAID5
Number of drives: 4
Drive Manufacturer: Samsung
Drive Model: HD204UI
Drive Firmware revision (if available): 1AQ10001
(All 4 drives are the same model)

According to the web interface the RAW VALUE of Current_Pending_Sector is "1".

Here's a dump of the SMART info from the problematic drive:

Code: Select all

[~] # get_hd_smartinfo -d 2                                 
001 Raw_Read_Error_Rate          1        100 100 051 OK
002 Throughput_Performance       18425    055 049 000 OK
003 Spin_Up_Time                 17264    044 039 025 OK
004 Start_Stop_Count             14715    086 086 000 OK
005 Reallocated_Sector_Ct        0        252 252 010 OK
007 Seek_Error_Rate              0        252 252 051 OK
008 Seek_Time_Performance        0        252 252 015 OK
009 Power_On_Hours               24966    100 100 000 OK
010 Spin_Retry_Count             0        252 252 051 OK
011 Calibration_Retry_Count      0        252 252 000 OK
012 Power_Cycle_Count            11       100 100 000 OK
181 Program_Fail_Count           10979    100 100 000 OK
191 G-Sense_Error_Rate           13       100 100 000 OK
192 Power-Off_Retract_Count      0        252 252 000 OK
194 Temperature_Celsius          36       064 050 000 OK
195 Hardware_ECC_Recovered       0        100 100 000 OK
196 Reallocated_Event_Count      0        252 252 000 OK
197 Current_Pending_Sector       1        100 100 000 ABNORMAL
198 Offline_Uncorrectable        0        252 252 000 OK
199 UDMA_CRC_Error_Count         0        200 200 000 OK
200 Multi_Zone_Error_Rate        124      100 100 000 OK
223 Load_Retry_Count             0        252 252 000 OK
225 Load_Cycle_Count             14715    099 099 000 OK

[schumaku]

There is absolutely nothing the NAS can do here:

A HDD does have it's own controller, with own software. As a part of it, a HDD vendor does reserve a certain amount of spare blocks. If the HDD firmware does experience issues - being on writing or reading a block of data (potentially what you see as "Raw Read Error Rate", too) - it does start a recovery process. Depending on the outcome, the HDD firmware does decide to continue using the same block - or mark the block to be replaced by a spare sector. This is the status you see with the "Current Pending Sector" ... it's pending to be replaced. One would expect that this "job" would be done within a reasonable time at normal HDD run time and/or during a full check, and problem-fix process.

In general, the "Current Pending Sector" is a temporary issue only. If the block will be replaced form the spare pool, the "Reallocated Sector Counter" will increment, resp. the number of spare blocks decrements.

If the apparently the same Current Pending Sector does remain there, and even more if the number is raising - take it as an early notification to trigger a HDD replacement. Considering the age of the HD204UI, power-on time of almost three years, resp. a spin-up time of two years ... time to look-out for funding to replace the HDD.

These three years are about the operational expectations for consumer desktop drives.

Regards,
-Kurt.

[clickclick]

Thank for the insight. Looks like it's time for a new drive... or drives.