Obi_One Posted October 19, 2014 Share Posted October 19, 2014 Hello, I am wonder about can preclear work on 4TB ? Sorry if this has been answered. Thanks Quote Link to comment
BRiT Posted October 19, 2014 Share Posted October 19, 2014 Yes, if you have the recent version. Quote Link to comment
itimpi Posted October 19, 2014 Share Posted October 19, 2014 I am wonder about can preclear work on 4TB ? I have pre-cleared disks up to 6TB in size without issues. Note that if on unRAID v6 it is important that you have the latest version of the pre-clear script as earlier releases had a bug that could occur in 64-bit versions of unRAID. It would be interesting to hear if any (rich ) unRAID users have yet tried pre-clear with disks larger than 6TB. Quote Link to comment
Obi_One Posted October 19, 2014 Author Share Posted October 19, 2014 Thanks. I have unraid version 5.04 will this version accept 4T drive ? will the latest preclear work with with 5.04 ? Thanks Quote Link to comment
itimpi Posted October 19, 2014 Share Posted October 19, 2014 Thanks. I have unraid version 5.04 will this version accept 4T drive ? will the latest preclear work with with 5.04 ? Thanks Pre-clear works the same regardless of the unRAID release. v5 supports 4TB (and larger) drives without issue. Quote Link to comment
jowi Posted October 19, 2014 Share Posted October 19, 2014 Yes & yes. See my sig. Preclearing 4TB (1 run) takes about 36 hours on my system. Quote Link to comment
JaY_III Posted October 23, 2014 Share Posted October 23, 2014 I just did 4 4TB drives not to long ago all at once. Took over 80hours for 3 passes Quote Link to comment
megalodon Posted October 24, 2014 Share Posted October 24, 2014 I only preclear one pass and it takes around 33 hrs for a 4TB. My 6TB drives take 53 hrs. Upgrade to 5.06 as well. Quote Link to comment
WeeboTech Posted October 25, 2014 Share Posted October 25, 2014 I've done my own form of preclear on 2 4T drives. This consists of a smart long test (Which I do on every drive right away). I suppose this is equivalent to the pre-read. A 4 Pass pattern using badblocks 0xaa, 0x55, 0xff and finally 0x00. Then another final smart long test I suppose this is equivalent to the post-read. I did these both at the same time via screen on unRAID 5.0.6 under ESXI 5 on an HP Microserver. Times are below. ModelPre-readBadblocksPost-ReadTotal Seagate ST4000DX001 - 4TB 5400 RPM Hybrid9:0367:349:0385 Hitachi HDN724040ALE640 - 4TB 7200 RPM9:3765:569:3783 I've included the logs in case anyone is curious about using smartctl long test and the badblocks pattern test for burn in/clear Seagate ST4000DX001 - 4TB 5400 RPM Hybrid root@unRAID2:/boot/logs# date;badblocks -sv -w -c 512 -t0xaa -t0x55 -t0xff -t0x00 -o /boot/logs/ST4000DX001-1CE168_Z3014JCE.201410221000.badblocks /dev/sdd Wed Oct 22 10:15:47 EDT 2014 Checking for bad blocks in read-write mode From block 0 to 3907018583 Testing with pattern 0xaa: done Reading and comparing: done Testing with pattern 0x55: done Reading and comparing: done Testing with pattern 0xff: done Reading and comparing: done Testing with pattern 0x00: done Reading and comparing: 59:11:20 elapsed 86.75% done, 65:59:48 elapsed 86.75% done, 65:59:50 elapsed done Pass completed, 0 bad blocks found. root@unRAID2:/boot/logs# date Sat Oct 25 05:50:13 EDT 2014 Hitachi HDN724040ALE640 - 4TB 7200 RPM root@unRAID2:/boot/logs# date;badblocks -sv -w -c 512 -o /boot/logs/HGST_HDN724040ALE640_PK2334PCGTEKJB.201410221000.badblocks -t0xaa -t0x55 -t0xff -t0x00 /dev/sdc Wed Oct 22 10:13:56 EDT 2014 Checking for bad blocks in read-write mode From block 0 to 3907018583 Testing with pattern 0xaa: done Reading and comparing: done Testing with pattern 0x55: done Reading and comparing: done Testing with pattern 0xff: done Reading and comparing: done Testing with pattern 0x00: done Reading and comparing: 94% done, 59:13:05 elapsed done Pass completed, 0 bad blocks found. root@unRAID2:/boot/logs# date Sat Oct 25 04:09:51 EDT 2014 root@unRAID2:/boot/logs# smartctl -t long /dev/sdc smartctl 6.2 2013-07-26 r3841 [i686-linux-3.9.11p-unRAID] (local build) Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org === START OF OFFLINE IMMEDIATE AND SELF-TEST SECTION === Sending command: "Execute SMART Extended self-test routine immediately in off-line mode". Drive command "Execute SMART Extended self-test routine immediately in off-line mode" successful. Testing has begun. Please wait 577 minutes for test to complete. Test will complete after Sat Oct 25 13:51:50 2014 At the end of this all,. I'll use JoeL's preclear to put the signature on the drive. I prefer to use smartctl long test for the pre/post reads as it logs it into the drive itself. I prefer to use badblocks as I can do multiple passes with patterns. I'm not fond of a blind dd. I like the ability to use patterns walking one way or another then clear with the -t0x00 However, as JoeL mentions, badblocks alone cannot determine the drive's health. You need to look at the syslog for retries and the smart logs for changes. Quote Link to comment
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