From: jim owens <jowens@hp.com>
To: Massimo Maggi <massimo@mmmm.it>
Cc: linux-btrfs@vger.kernel.org
Subject: Re: New idea about RAID and SSD
Date: Tue, 01 Sep 2009 09:10:21 -0400 [thread overview]
Message-ID: <4A9D1D3D.2070003@hp.com> (raw)
In-Reply-To: <4A9D1746.1020407@mmmm.it>
Massimo Maggi wrote:
> Hi,
> SSDs have low latency but a high price per GB,
> Traditional hard disks have high latency, but high sequential read/write
> speed and low price per GB.
> Is possibile to use a SSD for metadata, which requires many seeks and is
> relatively small, in a special "RAID mode" with a traditional hard disk
> for the extents of the real data?
> A cheap but performant SSD (maybe 32 GB) + a big and fast HD (maybe 1.5
> TB, or two in RAID0 - 3TB ), wouldn't create an array much cheaper than
> a ssd-only array of the same size, and much faster (in
> not-only-sequential workload) than one or two traditional HDs in RAID0?
> Would it work?
> Thank you for your precious time!
> Massimo Maggi
> massimo@mmmm.it
well, it is not a "new" idea.
yes people are thinking about it, but it is not the most critical
work on the list of things to do for btrfs or any other linux fs.
jim
prev parent reply other threads:[~2009-09-01 13:10 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-01 12:44 New idea about RAID and SSD Massimo Maggi
2009-09-01 13:05 ` Sander
2009-09-01 13:10 ` jim owens [this message]
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