Hi mates,
I've just received 2 new WD30EFRX (3Tb RED Edition) one of them I forgot to preclear ir so no data. But This is the results.
================================================================== 1.13
= unRAID server Pre-Clear disk /dev/sdb
= cycle 1 of 1, partition start on sector 1
= Disk Pre-Clear-Read completed DONE
= Step 1 of 10 - Copying zeros to first 2048k bytes DONE
= Step 2 of 10 - Copying zeros to remainder of disk to clear it DONE
= Step 3 of 10 - Disk is now cleared from MBR onward. DONE
= Step 4 of 10 - Clearing MBR bytes for partition 2,3 & 4 DONE
= Step 5 of 10 - Clearing MBR code area DONE
= Step 6 of 10 - Setting MBR signature bytes DONE
= Step 7 of 10 - Setting partition 1 to precleared state DONE
= Step 8 of 10 - Notifying kernel we changed the partitioning DONE
= Step 9 of 10 - Creating the /dev/disk/by* entries DONE
= Step 10 of 10 - Verifying if the MBR is cleared. DONE
= Disk Post-Clear-Read completed DONE
Disk Temperature: 31C, Elapsed Time: 35:22:10
========================================================================1.13
== WDC WD30EFRX-68AX9N0 WD-WMC1T0667118
== Disk /dev/sdb has been successfully precleared
== with a starting sector of 1
============================================================================
** Changed attributes in files: /tmp/smart_start_sdb /tmp/smart_finish_sdb
ATTRIBUTE NEW_VAL OLD_VAL FAILURE_THRESHOLD STATUS RAW_VALUE
Temperature_Celsius = 119 120 0 ok 31
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.
The box is a HP Microserver NL36, 8GB of ram, the bios is flashed to the last revision that allows a few more options in the shouthbridge. All ports in ACHI mode full speed. The disk I,m preclearing is in one of the disk slots through the minisas cable. UnRaid 5.0-beta14
It looks strange, in the preclear and postclear phases it begans a 145mb/s pretty good speed, but after a few minutes the speeds progresively slow down till 45mb/s where booth read phases are around 60% it speed up again to 120 / 125 mb/s and then progresively slow down again till finish. All the time there is no body accessing de array and the IO wait in a top command grows till 85%.
When I've precleared mi WD20EARX 10 months ago I don't think they took so long ...
Has somebody reported that slows down?
I will update the pendrive, take a look to the bios and make a new test.
Thanks.