[mdlug] SSD - flashcache or bcache

[Peter Bart]

On Mon, 13 Jan 2014 22:56:46 -0500
Aaron Kulkis <akulkis00 at gmail.com> wrote:

> Michael ORourke wrote:
> > Lug Nuts,
> >
> > Anyone out there using either of these technologies, flashcache or
> > bcache?  Basically looking to add some speed to a filesystem, but
> > would like to keep the existing RAID 1 volumes for redundancy.
> >
> > -Mike
> 
> As I understand it, Compared to disks, when writing, the throughput
> to flash memory is slow.
> 
> Flash memory is GREAT for things like directories
> like /etc, /bin, /sbin, /usr/bin, /usr/sbin, because the files in
> them are written VERY occasionally (software updates and
> configuration changes), and so there are al the advantages of a
> technology that eliminates the disk-drive associate delays of
> read/write head seek time and rotational delay.
> 
> Also, using flash for swap space is just going to wear out very
> expensive memory very quickly.
> 

FWIW I've been using flash memory for swap; among others; in several
devices for several years and have yet to experience failure. I do not
have any benchmarks, just my personal opinion based on the fact these
devices work every time I use them.

-- 
Best Regards,

Peter The Plumber
<petertheplumber at att.net>