February 14, 201115 yr I'm currently running version 4.6 and I am planning to upgrade to 4.7 to take advantage of the advanced format drives. I have pre-cleared 3 2TB WD EARS drives using the -A switch to start the first partition at sector 64. I plan to replace 3 existing drives in the array with the 2TB WD EARS drives. However, the existing drives were formatted with the first partition starting at sector 63. Will replacing them with 2TB WD EARS drives keep the first partition starting at sector 64 (as on the WD EARS) or will it revert to sector 63?
February 14, 201115 yr I'm currently running version 4.6 and I am planning to upgrade to 4.7 to take advantage of the advanced format drives. I have pre-cleared 3 2TB WD EARS drives using the -A switch to start the first partition at sector 64. I plan to replace 3 existing drives in the array with the 2TB WD EARS drives. However, the existing drives were formatted with the first partition starting at sector 63. Will replacing them with 2TB WD EARS drives keep the first partition starting at sector 64 (as on the WD EARS) or will it revert to sector 63? If you perform the replacement on version 4.7 of unRAID it will use the new partition starting on sector 64. I hope you did not add any jumper to those new EARS drives when you used the "-A" option to preclear, as that would make the actual sector on the disk start at physical sector 65... and you would not be aligned at a 4096 byte boundary.
February 14, 201115 yr Author If you perform the replacement on version 4.7 of unRAID it will use the new partition starting on sector 64. I hope you did not add any jumper to those new EARS drives when you used the "-A" option to preclear, as that would make the actual sector on the disk start at physical sector 65... and you would not be aligned at a 4096 byte boundary. I am planning to upgrade to 4.7 first, then replace the drives. No jumpers were added to the WD EARS drives.
February 14, 201115 yr unRAID is supposed to respect the pre-clearing even if it's a replacement drive and not a new one. Still, there is a setting for 4k-aligned in unRAID 4.7 you will also want to set. Peter
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