SSD sector specifications issues (fwd)

[D. Hugh Redelmeier]

resending AGAIN.

---------- Forwarded message ----------
From: D. Hugh Redelmeier <hugh-pmF8o41NoarQT0dZR+AlfA at public.gmane.org>
To: Toronto Linux Users Group <tlug-lxSQFCZeNF4 at public.gmane.org>
Date: Wed, 16 Jul 2014 13:34:19 -0400 (EDT)
Subject: Re: [TLUG]: SSD sector specifications issues (fwd)

resending because this hasn't yet shown up.

---------- Forwarded message ----------
From: D. Hugh Redelmeier <hugh-pmF8o41NoarQT0dZR+AlfA at public.gmane.org>
To: TLUG mailing list <tlug-lxSQFCZeNF4 at public.gmane.org>
Date: Mon, 14 Jul 2014 20:29:40 -0400 (EDT)
Subject: Re: [TLUG]: SSD sector specifications issues

| From: William Muriithi <william.muriithi-Re5JQEeQqe8AvxtiuMwx3w at public.gmane.org>

| The system is currently using 512 sectors, but I suspect the SSD native
| sectors are 4096.

What's slow: write or read?

The concept of sector as we know it is somewhat faked on NAND flash.
One related concept is the unit in which things can be erased.  I
don't know what those are but I imagine things in the megabyte range.
But I don't think you need to be aware of it.

You can use hdparm -I to find out the logical and physical sector
sizes (unless the drive lies).

SSDs can be helped by using the trim feature.  The command fstrim will
do it, or a mount option.  This only helps writes.
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