February 24, 201115 yr Hey guys got a noob question.. just started building my unraid server and i've got 1 2tb drive up and running and just started preclearing the second one... i was following this config guide http://www.lime-technology.com/wiki/index.php?title=Configuration_Tutorial and then read somewhere in the forums about 4k alignments or something like that using -A or -a... i've precleared my first 2 drives with this ./preclear_disk.sh /dev/sdX then i noticed the guide was for an older version...i'm using the latest stable build 4.7 am i going to have any issues? please help thanks.. i still have my parity drive but need to get data off of it before a preclear.. should i preclear that drive differently?
February 24, 201115 yr What kind of drives are they? The short version is: Western Digital EARS with jumper on pins 7-8 you want to preclear without the -A option. Western Digital EARS without jumper on pins 7-8 you want to preclear with the -A option. Any other drive that is marked as Advanced Format (AF) you would want to preclear with the -A option. Any drive that is not marked as AF doesn't matter, either method will align on a boundary. If you want to change the drive you have already precleared (assuming it is still in a precleared state and has not had anything written to it or been added to an array) there is a way to do that quickly. Check in the preclear thread for more info. And thanks for reminding me the config tutorial needs to be updated
February 25, 201115 yr Also put in a note that preclear_disk.sh is a living ongoing addon so one should always check for the newest version before they're about to preclear.
February 25, 201115 yr Author ummm.. ok even more lost now.. i've done 2 drives now.. samsung f4 2tb advanced format drive and currently doing a wd green 1.5 tb both times i just entered ./preclear_disk.sh /dev/sdX and then typed Yes the samsung has been setup as a data drive and has data in it now the 1.5 is still being cleared... i used the latest version from the preclear thread i think... do i need to do everything all over again?
February 25, 201115 yr ummm.. ok even more lost now.. i've done 2 drives now.. samsung f4 2tb advanced format drive and currently doing a wd green 1.5 tb both times i just entered ./preclear_disk.sh /dev/sdX and then typed Yes the samsung has been setup as a data drive and has data in it now the 1.5 is still being cleared... i used the latest version from the preclear thread i think... do i need to do everything all over again? If you are using the latest version of the preclear script the "alignment" it uses, in the absence of a specific "-A" or "-a" command line argument will be the alignment you specified on the unRAID settings screen. You can determine the alignment by typing fdisk -l -u /dev/sdX If you've not yet assigned the disk to your array you can use the "-C" option to change the sector alignment.
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