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Re: op-journaled fs, journal size and storage speeds

To: xfs@xxxxxxxxxxx
Subject: Re: op-journaled fs, journal size and storage speeds
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Sun, 01 May 2011 23:35:30 -0500
In-reply-to: <20110501092758.GG13542@dastard>
References: <19900.8703.214676.218477@xxxxxxxxxxxxxxxxxx> <20110501092758.GG13542@dastard>
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.9.2.17) Gecko/20110414 Thunderbird/3.1.10
On 5/1/2011 4:27 AM, Dave Chinner wrote:

Got a supplier for the custom hardware you'd need? Just use a PCIe
SSD....

50GB OCZ RevoDrive PCIe x4 SSD MLC NAND
Dual SandForce 1200 controllers, internal RAID 0 design
70,000 write IOPS, 4KB aligned
350MB/s write sustained

$200 USD at Newegg:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820227596

Current best value for a PCIe SSD suitable for dedicated log drive use, can fit ~22 maximum size (2GB) XFS logs. Note the MLC NAND. If all your filesystems will sustain constant high rate metadata writes, an SLC based product is more suitable, though price is 10-50x higher for PCIe SLC cards. If you want/need the 10x increase in flash cell life of SLC NAND, go with this Intel SLC SATAII SSD for ~2x the $$ of the Revo. Note it's write IOPS is 'only' 33k, size is 32GB, 18GB less.

http://www.newegg.com/Product/Product.aspx?Item=N82E16820167013

--
Stan

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