[Asterisk-Users] Asterisk on Compact PCI platform

[Jay Milk]

Kingston claims 300K: 
http://www.kingston.com/products/MKF_2603CF.pdf
http://www.kingston.com/literature/MKF_591EliteProCF.pdf

Sandisk Industrial claims 300K-2M "industrial", but only 100K "extended"
cycles (whatever that may mean):
http://www.sandisk.com/industrial_cf_card_specifications.html

Here's the culprit:
http://www.toshiba.com/taec/adinfo/nandflash/
...clearly states that MLC NAND Flash memory has an expected endurance
of 10,000 read/write cycles.

Bottom line is that flash memory designed for industrial application is
likely much more reliable than flash-cards purchased for digital cameras
and such.  Toshiba is actively promoting a consumer flash memory
technology with an expected endurance of 10,000 cycles.  While that
technology will be more than sufficient for the intended audience, this
would present a performance risk for an embedded application; so if I
wanted to replace my HD with a flash-card, I would need to be rather
mindful of the type of flash memory utilized in that card.


-----Original Message-----
From: asterisk-users-admin at lists.digium.com
[mailto:asterisk-users-admin at lists.digium.com] On Behalf Of George
Pajari
Sent: Friday, May 21, 2004 12:40 PM
To: asterisk-users at lists.digium.com
Subject: Re: [Asterisk-Users] Asterisk on Compact PCI platform


> A modern CF card has about 10,000 write cycles before it starts 
> failing.

Don't know where you're buying that crap but quality CF modules have a
per-sector lifetime of between 300,000 and 2,000,000 write cycles. On
top of this, good quality CF modules have very sophisticated wear
levelling firmware that map external block addresses to different
physical sector addresses to reduce the possibility of "burning out"
specific sectors from frequent updates.

In addition to my work with NetVoice Communications I am also associated
with a Linux fax software company (www.faximum.com) that ships a fax
server appliance which run entirely on CF. We have customers sending
hundreds of faxes per day (comparable to hundreds of voice mails per
day) without any trouble after a year and a half (nor would we expect
any problem).

I.M.H.O. The fears expressed on this list about the lifetime of CF
modules are not based on either the facts or empirical evidence.

g.

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