Which BSD - Flash Drive
cswiger at mac.com
Fri Apr 7 17:29:10 UTC 2006
Gayn Winters wrote:
>> [mailto:owner-freebsd-questions at freebsd.org] On Behalf Of
>> Malcolm Fitzgerald
[ ... ]
> Where they rate their own flash at 1,000,000 read/write cycles.
The typical flash drive used to be rated for about 10,000 writes, but the
better vendors do better. :-)
They've also started doing things like "wear leveling" by rotating the
sectors being written to, which help avoid hotspots forming which wear out
earlier (ie, the directory entry for / or /tmp). But you need to look for
that feature in your flash drives as the low-cost ones typically won't have it!
You can help things out a lot by disabling file access time updating
("noatime" flag to mount), and by using RAMdisks and a no-swap config, as
someone else had mentioned.
But I'll repeat my caveat: if you want to run a general-purpose FreeBSD
system, you're better off using a hard drive than flash. Save using flash
for dedicated appliances where you've taken steps to control writes.
PS: I'm seeing a relatively significant number of 5-8 year old Cisco boxes
starting to wear out their flash chips and fail (ie, 3 out of about a dozen
or so I've had contact with over the years).
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