Server Building > Hard Drives and Controllers
Clearing Confusion on AF Drives
keyman33:
Folks, I've hunted but cannot seem to find this answer, so apologies if it's a silly question. :P
I'm running 4.7 with MBR: 4k aligned. All drives are AF.
I found an old, non-AF drive that I want to add to the array.
Can I add it, or is that a bad idea? Also, I intend to run the pre-clear script as per normal.
thanks!
BRiT:
Yes you can add it. Use the -A flag as well.
keyman33:
Excellent. Thanks, Brit!
hunter69:
I have been experiencing freezing when streaming blu-rays from my unraid server. I have seen this behavior for quite a while. I am wondering if I did something wrong when formatting my drives. So I am wanting to remove 1 drive at a time and run pre-clear on the drives then readd it to the array. I am running unraid V4.7. Right now I see in the unraid consoles under disk settings it states "Default Partition Format=MBR:Unaligned. My drives are WD20EARS. From extensive reading I think I need to do the following:
Change the setting to MBR 4k aligned
remove the jumpers to my hard drives
I have 1 parity and 5 disks.
My array contains a lot of data (primarily dvd's and blu-rays.)
So I am wondering the procedure I should follow to accomplish my goal. Like when should I change the unraid console to MBR 4k aligned etc.
What commands should I use to properly format my drives? example preclear_disk.sh -A dev/sdX (would this be correct?)
Should I do the following to accomplish this:
Stop the array
Remove the disk from the array
Start the array
Preclear the disk
stop the array
readd the disk
start the array
start a parity check
Once the parity check is complete, repeat the above procedure.
Thanks for any help you can provide.
Joe L.:
--- Quote from: hunter69 on May 11, 2012, 01:43:41 AM ---I have been experiencing freezing when streaming blu-rays from my unraid server. I have seen this behavior for quite a while. I am wondering if I did something wrong when formatting my drives. So I am wanting to remove 1 drive at a time and run pre-clear on the drives then readd it to the array. I am running unraid V4.7. Right now I see in the unraid consoles under disk settings it states "Default Partition Format=MBR:Unaligned. My drives are WD20EARS. From extensive reading I think I need to do the following:
Change the setting to MBR 4k aligned
remove the jumpers to my hard drives
I have 1 parity and 5 disks.
My array contains a lot of data (primarily dvd's and blu-rays.)
So I am wondering the procedure I should follow to accomplish my goal. Like when should I change the unraid console to MBR 4k aligned etc.
What commands should I use to properly format my drives? example preclear_disk.sh -A dev/sdX (would this be correct?)
Should I do the following to accomplish this:
Stop the array
Remove the disk from the array
Start the array
Preclear the disk
stop the array
readd the disk
start the array
start a parity check
Once the parity check is complete, repeat the above procedure.
Thanks for any help you can provide.
--- End quote ---
Correct procedure. However if you added the "jumper" to those EARS drives already, then you ARE already partitioned correctly. The jumper electrically adds one to the sector being requested, so the MBR:unaligned is transformed electrically to one that is aligned.
The only way performance would be improved is if you had installed the jumper on the wrong pins.
If, as you say you have jumpers installed on the correct pins, you ALREADY have the most optimal settings for your disks. The procedure you are thinking of will ONLY put your data at risk. (In other words, others have lost data when something goes wrong, or they do something wrong) In some cases, the disk had to be RMA'd. Some have reported they do not like having the jumper settings reverted.
The symptoms you describe probably have nothing to do with how the disk is configured, but far more with the networking.
Joe L.
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