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List:       debian-user
Subject:    Re: Tracing Filesystem Accesses
From:       Jochen Schulz <ml () well-adjusted ! de>
Date:       2011-05-13 20:08:18
Message-ID: 20110513200817.GT6474 () wasteland ! homelinux ! net
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Bob McConnell:
> 
> Before we go any further, lets get a couple of things sorted out.
> What type of SSD (Solid State Drive) are you all talking about here?
> 
> If it contains Flash memory,

What else do you have in mind?

> then yes, there is a limit to the
> number of ERASE cycles each sector can do. How long they last
> depends on a number of factors, not the least of which is how old
> the chips are. The first generations of flash memory chips could
> only be erased about 10,000 times before they started to fail.

Current generation (consumer-grade) MLC SSDs using 25nm technology use
flash that can only be rewritten 3000 times. Assuming perfect wear
levelling, that's still enough for most desktop applications.
120GB*3000=360TB.  That's still almost 100GB per day for ten years. Even
if write amplification quintuples the amount of date written, that's
still 20GB per day. My systems don't write that much.

J.
-- 
If I was a supermodel I would give all my cocaine to the socially
excluded.
[Agree]   [Disagree]
                 <http://www.slowlydownward.com/NODATA/data_enter2.html>

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