From mboxrd@z Thu Jan 1 00:00:00 1970 From: Lutz Vieweg Subject: Re: Software RAID and TRIM Date: Wed, 20 Jul 2011 14:25:36 +0200 Message-ID: References: <4E235984.2070704@5t9.de> <1311164022.2031.0.camel@werner-t410> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <1311164022.2031.0.camel@werner-t410> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On 07/20/2011 02:13 PM, Werner Fischer wrote: > There is a paper from Intel "Over-provisioning an Intel=C2=AE SSD" (a= nalyzing > X25-M 160 GB Gen.2 SSDs): > http://cache-www.intel.com/cd/00/00/45/95/459555_459555.pdf > > On page 10 of this Intel presentation they mention that a spare area >> 27% of native capacity has diminishing returns for such an SSD: > http://maltiel-consulting.com/Enterprise_Data_Integrity_Increasing_En= durance.pdf (This latter document is password protected.) The first document, though, claims almost linear benefit (regarding IOs= /sec) from much higher amounts of over-provisioning. Alas, their chart does n= ot extend into the region where saturation of the effect must occur for sure. Regards, Lutz Vieweg -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html