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Re: Beating a dead horse

Swift Griggs <> writes:

> On Tue, 24 Nov 2015, Felix Deichmann wrote:
>> You can probably save a lot of time, tries and headache by doing a
>> fresh installation of your server with correct alignment and block
>> sizes...
> Is there a procedure online somewhere for verifying that you have
> properly aligned your file system on a UFS partition/disklabel'd-slice

More or less, there are 3 kinds of disks: 512B disks, 4KB disks that
have 512B interfaces, and disks with larger sectors in the interface.
It's only the split 4K/512B disks that need extra care in alignment.

There is no real trick, other than verifying that the starting sector
numbers in disklabel or gpt are divisible by 8.

> ? Are there any special (fstab/sysctl/etc) flags to be aware of when
> using 4K disks or SSDs ?

Not that I know of.

I have not yet seen a 4K ssd, although one would not really surprise

> These release notes mention trim:

I believe TRIM is a separate issue from sector alignment.

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