Seagate’s first shingled hard drives now shipping: 8TB for just $260


Recommended Posts

Since these are still relatively new drives, I thought I'd post my preclear results for the 2 ST8000AS0002 I just installed:

: ========================================================================1.15
: == invoked as: ./preclear_disk.sh /dev/sdb
: == ST8000AS0002-1NA17Z   Z8403xxx
: == Disk /dev/sdb has been successfully precleared
: == with a starting sector of 1 
: == Ran 1 cycle
: ==
: == Using :Read block size = 1000448 Bytes
: == Last Cycle's Pre Read Time  : 19:44:58 (112 MB/s)
: == Last Cycle's Zeroing time   : 16:22:29 (135 MB/s)
: == Last Cycle's Post Read Time : 37:42:48 (58 MB/s)
: == Last Cycle's Total Time     : 73:51:20
: ==
: == Total Elapsed Time 73:51:20
: ==
: == Disk Start Temperature: 25C
: ==
: == Current Disk Temperature: 37C, "
: ==
: ============================================================================
: ** Changed attributes in files: /tmp/smart_start_sdb  /tmp/smart_finish_sdb
:                 ATTRIBUTE   NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS      RAW_VALUE
:       Raw_Read_Error_Rate =   111     100            6        ok          35617992
:           Seek_Error_Rate =    73     100           30        ok          21054924
:          Spin_Retry_Count =   100     100           97        near_thresh 0
:          End-to-End_Error =   100     100           99        near_thresh 0
:   Airflow_Temperature_Cel =    63      75           45        near_thresh 37
:       Temperature_Celsius =    37      25            0        ok          37
:    Hardware_ECC_Recovered =   111     100            0        ok          35617992
:  No SMART attributes are FAILING_NOW
: 
:  0 sectors were pending re-allocation before the start of the preclear.
:  0 sectors were pending re-allocation after pre-read in cycle 1 of 1.
:  0 sectors were pending re-allocation after zero of disk in cycle 1 of 1.
:  0 sectors are pending re-allocation at the end of the preclear,"
:     the number of sectors pending re-allocation did not change.
:  0 sectors had been re-allocated before the start of the preclear.
:  0 sectors are re-allocated at the end of the preclear,"
:     the number of sectors re-allocated did not change. 
: ============================================================================
: ========================================================================1.15
: == invoked as: ./preclear_disk.sh /dev/sdc
: == ST8000AS0002-1NA17Z   Z8403xxx
: == Disk /dev/sdc has been successfully precleared
: == with a starting sector of 1 
: == Ran 1 cycle
: ==
: == Using :Read block size = 1000448 Bytes
: == Last Cycle's Pre Read Time  : 19:52:10 (111 MB/s)
: == Last Cycle's Zeroing time   : 16:32:45 (134 MB/s)
: == Last Cycle's Post Read Time : 37:49:29 (58 MB/s)
: == Last Cycle's Total Time     : 74:15:27
: ==
: == Total Elapsed Time 74:15:27
: ==
: == Disk Start Temperature: 26C
: ==
: == Current Disk Temperature: 38C, "
: ==
: ============================================================================
: ** Changed attributes in files: /tmp/smart_start_sdc  /tmp/smart_finish_sdc
:                 ATTRIBUTE   NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS      RAW_VALUE
:       Raw_Read_Error_Rate =   112     100            6        ok          45860856
:           Seek_Error_Rate =    73     100           30        ok          21308774
:          Spin_Retry_Count =   100     100           97        near_thresh 0
:          End-to-End_Error =   100     100           99        near_thresh 0
:   Airflow_Temperature_Cel =    62      74           45        near_thresh 38
:       Temperature_Celsius =    38      26            0        ok          38
:    Hardware_ECC_Recovered =   112     100            0        ok          45860856
:  No SMART attributes are FAILING_NOW
: 
:  0 sectors were pending re-allocation before the start of the preclear.
:  0 sectors were pending re-allocation after pre-read in cycle 1 of 1.
:  0 sectors were pending re-allocation after zero of disk in cycle 1 of 1.
:  0 sectors are pending re-allocation at the end of the preclear,"
:     the number of sectors pending re-allocation did not change.
:  0 sectors had been re-allocated before the start of the preclear.
:  0 sectors are re-allocated at the end of the preclear,"
:     the number of sectors re-allocated did not change. 
: ============================================================================

 

Those are fine.

 

I "personally" would like to see the temps a "little" lower BUT they are well within manufacturers tolerances for those drives especially at high load. And 40'c is the break point for me so you are good imho.

 

Furthermore, I would have run the disk through 3 cycles and a further long S.M.A.R.T test to gain a stronger degree of assurance that the disks are ok before trusting them with my data. That however is your risk to own - so your call.

Link to comment
  • Replies 655
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

Posted Images

I only wonder why Pre Read was at much faster speed than Post Read?  :o

 

It is normal for the last pass to be slower. Almost 1/2 speed of first pass is about right - unless you're using Brian's "Faster" preclear script.

 

I believe the reason it is slower is that the last pass is a full read AND verify of the zeros written. Not sure if it's read is random too!?

Link to comment

I only wonder why Pre Read was at much faster speed than Post Read?  :o

 

That's normal.    There's a different version posted by bjp999 that does the post-read faster (in roughly the same time as the pre-read) ... but the longer post-read is normal for JoeL's script.

 

Man you're fast!!!  ;)

Link to comment

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Restore formatting

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.