Re: [9fans] just an idea (Splashtop like)

[John DeGood <bulk@degood.org>]

erik quanstrom wrote:
> just looking at the intel x25-e datasheet, the URE rate
> (unrecoverable read error) is the same as enterprise sata
> drives at 1e-15, but the mtbf is higher, but within a factor
> of two.
>
> assuming honest mtbf numbers, one would expect similar
> ures for the same io workload on the same size data set
> as mechanical disks.
...
> here are the datasheets.
>
> http://download.intel.com/design/flash/nand/extreme/319984.pdf
> http://www.wdc.com/en/library/spec/2879-701281.pdf

For the Intel SSD one must also consider:

> 3.5.4 Write Endurance
> 32 GB drive supports 1 petabyte of lifetime random writes and 64 GB drive supports 2 petabyte of lifetime random writes.

That is equivalent to writing the capacity of the SSD 31250 times.  At
the specified random 4K write rate of 3300 IOPS one could wear out the
SSD in 876 days.  Non-random writes could cause more rapid wear,
depending on their pattern and the wear leveling algorithms in the SSD.

John