August 24, 201213 yr im currently using unraid 4.6. i have 6 2tb wd green drives with jumpers in it. i added 1.5tb green drive i had laying around without a jumper by accident. everything went fine but a few days later i remembered that i was suppoesed to jumper the drive. i tried to just power down and add the jumper but the drive will not show up in the devices tab wit the jumper installed. i removed the drive and formated it in windows thinking that maybe reformatting it would help but the same thing happens. if i remove the jumper it will show up fine. what should i do to correct this. if it matters there is never been anything on this drive and i have now removed it from my config and rebuilt parity. thx
August 24, 201213 yr Remove the jumper and set unRAID to 4k-aligned. Clear the drive somehow (format in Windows, preclear, use the dd command) and try the drive again.
August 24, 201213 yr Author im not sure i understand correctly. the drive works fine as long as i do not jumper it. i also do not know how/were to set unRAID to 4k-aligned? will that mess up my exsiting jumpered discs? what happens if i just run it without the jumper?
August 24, 201213 yr im not sure i understand correctly. the drive works fine as long as i do not jumper it. i also do not know how/were to set unRAID to 4k-aligned? will that mess up my exsiting jumpered discs? what happens if i just run it without the jumper? Only one specific model drive uses that jumper. What specific model is your drive? The 4k alignment setting in unRAID ONLY AFFECTS disks you install in the future. It simply indicates you wish the partition to start on sector 64 vs. sector 63. (Sector 63 was the prior default, as it is how all MS-Windows set their partitions from the earliest MS-Dos days.) It does not affect disks already assigned to the array. You can have a mix of drives starting on either sector 63, or sector64. Makes no difference at all to unRAID. Today,sector 64 is preferred. (Because some poorly written firmware on one specific WD called "advanced format" drive is noticeably slower in some tests on small files) In reality, either setting works for any drive unless you are a performance addict. Leave the jumper off the drive, set the option for 4k alignment (under Settigs->Default partition format:->MBR 4k Aligned" in unRAID's management web-page) ,and forget either exist going forward. Joe L.
August 24, 201213 yr im not sure i understand correctly. the drive works fine as long as i do not jumper it. i also do not know how/were to set unRAID to 4k-aligned? will that mess up my exsiting jumpered discs? what happens if i just run it without the jumper? If you look through the settings page of unRAID you'd find the aligment setting. I wouldn't recommend you change the setting if it would mess up your existing disks. At this point, you have to run it without the jumper, hence me recommending you remove it. If you mean running no jumper without changing the setting to 4k-aligned and clearing the partition off the disk before re-installing it, then it will still work not aligned but it will just be a little slower.
August 24, 201213 yr im not sure i understand correctly. the drive works fine as long as i do not jumper it. i also do not know how/were to set unRAID to 4k-aligned? will that mess up my exsiting jumpered discs? what happens if i just run it without the jumper? I wouldn't recommend you change the setting if it would mess up your existing disks. Changing the "Setings->default partition format" setting has absolutely no effect on existing drives. They stay as they were, and work as they did. You can change the setting from MBR-unaligned ,toMBR-4kaligned at any time. It is only used when creating the initial partition when you add a brand new un-cleared and previously unused drive(unused in a unRAID server) At this point, you have to run it without the jumper, hence me recommending you remove it. If you mean running no jumper without changing the setting to 4k-aligned and clearing the partition off the disk before re-installing it, then it will still work not aligned but it will just be a little slower. We don't even know if he has one of the drives that uses a jumper. It was only one model from one manufacturer that used it, and he never mentioned the exact drive involved.. Putting a jumper on drive that does not have that option is likely to do almost anything, including damage its electronics.
August 24, 201213 yr Author sorry the drive in question is a wd15ears drive. i still cannot find the 4k alignment option? is it possible its not in 4.6?
August 24, 201213 yr sorry the drive in question is a wd15ears drive. i still cannot find the 4k alignment option? is it possible its not in 4.6? It was added in 4.7. Recommend you upgrade.
Archived
This topic is now archived and is closed to further replies.