February 7, 201412 yr Have 5.0.4 running with 4TB Seagate ST4000DM000 and just saw in the Disk Settings that unRAID is running with the "default partition format" MBR: unaligned. Shouldn't I change this to aligned? Was it not that all 4TB disks are aligned anyway? Regarding the other parameters within the Disk Settings: should NCQ be enabled or disabled? And what is best to use for the tunables (md_num_stripes, md_write_limit and md_sync_windows)? Thanks much!
February 7, 201412 yr I believe you are correct with respect to drives > 2.2TB. They will be aligned regardless of the setting in UnRAID or any switches you use in the pre_clear script (if you're using it). I would suggest aligning any new drives that you add to your array. Keep us posted on your progress with the tunables script as I'm interested to try it as well but haven't done a lot of research on it thus far.
February 7, 201412 yr Author I have only 4TB drives in that array and all should be 64k aligned. Thus I wondered about this setting. Should I set to 64k aligned? It doesn't recognize the drives and the default is 63k unaligned... wondering why is this. Thanks Squid, for the link. Is it safe to be used on a loaded array with data?
February 7, 201412 yr Author Ok. The alignment option in Disk Settings is unaligned by default (see snapshot), also not checking actual alignment/unalignment of disks.
February 7, 201412 yr Author But isn't NCQ actually a good thing to have. The ST4000DM000 support NCQ.
February 7, 201412 yr The default setting is Yes. Change it and see if your system works better. The default was picked to work best with unRAID.
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