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Date:      Fri, 11 Feb 2011 13:33:07 -0600
From:      Adam Vande More <>
To:        FreeBSD Mailing List <>
Subject:   Re: FreeBSD and SSD drives
Message-ID:  <>
In-Reply-To: <20110211185738.GB45708@guilt.hydra>
References:  <> <20110211185738.GB45708@guilt.hydra>

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On Fri, Feb 11, 2011 at 12:57 PM, Chad Perrin <> wrote:

> Ignoring the TRIM issue for a moment . . .
> You're probably best off saving SSD storage for cases where you have lots
> of reads and little to no write activity, unless you enjoy buying new
> SSDs a lot.  Actually, let's not ignore TRIM; the work-around for lack of
> TRIM support on some drives is a "garbage collection" routine that
> exacerbates the problem of having to replace your SSDs more often if you
> do a lot of writes.
> I guess I would only use SSDs on servers in the same cases where I would
> let myself be talked into using MySQL -- cases where you just treat it
> pretty much like a read-only data store, and do not have to (safely) add
> or change data stored there most of the time.

Modern SSD's can do a *lot* of writes, wear-leveling and other tecniques
allow SSD's to be implemented for nearly any workload.  There's a great deal
of literature and facts on this topic if someone was motivated enough to
research it.  Some legends are better off fading away.

Same thing is sort of true with TRIM, on most modern drives lack of OS TRIM
support isn't the performance hit it used to be although still desirable.

Adam Vande More

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