On Wed, 13 Nov 2013 03:42:54 -0500, Francis Moreau
<francis.moro@xxxxxxxxx> wrote:
First I'd like to know if over-provisioning is still needed when
bcache is used ?
it's needed for any decent, sustained write load if you don't want
performance to crash thru the floor. But it doesn't sound like this is
your use case. Are you sustaining 5000+ write IOPs?
- Should I create 2 partitions with one left emtpy and whose size is
roughly 7% of the device size ?
Your SSD already has 7% overprovisioning. For best sustained and
consistent write performance you'll want to bump it to 25-30%. Yes you
just need to partition/LVM down to the desired size.
- Should I create a "Host Protected Area" by using hdparm ?
http://www.thomas-krenn.com/en/wiki/SSD_Over-provisioning_using_hdparm
Either take the precautions outlined in the WIKI given the penchant of the
kernel to ignore such settings, or just remove the chance for error and
partition the device instead.
And finally, can I create the over-provisioning without lost the
content of my backing device ?
hell no.
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