On 11/08/2013 12:59 PM, Gruher, Joseph R wrote:
-----Original Message-----
From: Dinu Vlad [mailto:dinuvlad13@xxxxxxxxx]
Sent: Thursday, November 07, 2013 10:37 AM
To: james@xxxxxxxxxxxx; Gruher, Joseph R; ceph-users@xxxxxxxxxxxxxx
Subject: Re: ceph cluster performance
I was under the same impression - using a small portion of the SSD via
partitioning (in my case - 30 gigs out of 240) would have the same effect as
activating the HPA explicitly.
Am I wrong?
I pinged a guy on the SSD team here at Intel and he confirmed - if you have a new drive (or freshly secure erased drive) and you only use the subset of the capacity (such as by creating a small partition) you effectively get the same benefits as overprovisioning the hidden area of the drive (or underprovisioning the available capacity if you prefer to look at it that way). It's really all about maintaining a larger area of cells where the SSDs knows it does not have to preserve the data, one way or the other.
That was my understanding as well, but it's great to have confirmation
from Intel! Thanks Joseph!
Mark
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