Ive build many a system with CF cards, they are very reliable(BSD
based). Just don't write to them! cf's will easily outlive anyone in a
ro state.
There are some tips and tricks though you need to be aware of when using
ssd's (linux has some additional tweaks needed over *BSD)
In short though without writing a really lengthy email,
You'll want to optimize a base image of your desired os to be read only,
things like /var should be mounted as memory disks.
This will give your CF card (or other ssd) an indefinite mtb (75+ years
if your not writing to it). If you really want to bolster its
performance on small hardware create an operating system that runs
entirley in ram (loaded from a ro ssd on boot).
A really good example of well put together os/asterisk distribution is
askoiza. (http://www.askozia.com/)
Id recommend anyone interested in os/file layouts for ssd's do a quick
play about with the embedded version.
Regards,
Philip Mullis
Peter MacFarlane wrote:
Would that explain why my CF card got corrupted and had to be
reformatted? I was running OpenBSD on it with the FFS file system and
a StarTech IDE adapter. Seems OK now but I'm not sure how reliable it
is without more testing. How do you find a reliable CF card?
Peter M.
Simon P. Ditner wrote:
I think it was Dave that was recommending the solid state disks.
When moving over to solid state, keep in mind that the consumer CF/SD
cards are not designed for environments where there are a lot of
small writes. The technology is improving rapidly as well, so the
market is now swimming in flash of varying degrees of durability with
no clear identification.
There are wear levelling algorithms built into the cards to help
extend the lifetime of the flash, but you'd be surprised how many
writes there are when using conventional filesystems! For instance,
every time you access a file, the atime (last access time) gets
updated unless you disable it.
Another caveate is that the cell size is (I believe) 32kb, and
requires a full erase/write cycle to update any byte in that cell.
You unfortunately can not control this, as the memory storage
mechanism is abstracted away in the hardware and presented to you as
a block device unless you are using an MTD (you're likely not if
ATA/IDE/USB adapters are involved).
This will all be moot in a year or so though, the newer solid state
disks support a stupid number of writes.
--
| It ain't what you don't know that gets you into trouble. It's what
| you know for sure that just ain't so. -- Mark Twain
|
| Network: http://www.linkedin.com/in/spditner
| http://facebook.com/people/Simon-P-Ditner/776370031
| http://twitter.com/spditner
On Sat, 7 Feb 2009, Henry L.Coleman wrote:
Hi all, thanks to a tip from Simon I'm looking at replacing HD with
Solid state drive SDHD in IBM thinkcentre PCs I would have to
replace the IDE drive for a new drive anyway, so the cost for the
adaptor and memory card (say 8/16 Mb) must be in the region of $85
My question is can I what combo would work well as there are many
adaptors (at Dealextreem) and lots of memory types.
H
=================================
Henry L.Coleman [www.VoIP-PBX.ca]
Tel: 647-723-5160 Ext.203
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