From: Thomas Fjellstrom <tfjellstrom@shaw.ca>
To: Adam Megacz <adam@megacz.com>
Cc: linux-raid@vger.kernel.org
Subject: Re: anybody using the gc-ramdisk?
Date: Mon, 4 Jan 2010 21:24:55 -0700 [thread overview]
Message-ID: <201001042124.56019.tfjellstrom@shaw.ca> (raw)
In-Reply-To: <xuu2aawtfu4c.fsf@nowhere.com>
On Mon January 4 2010, Adam Megacz wrote:
> Has anybody tried using the GC-Ramdisk (aka iRAM -- four DDR DIMMs on a
> PCI card with a battery backup)
>
>
> http://www.gigabyte.com.tw/Products/Storage/Products_Overview.aspx?Produ
> ctID=2180 http://en.wikipedia.org/wiki/I-RAM
>
> Performance is much better than flash memories, but the price per
> gigabyte is much greater and maximum capacity is far less. It's really
> closer to the nvram cache on a hardware raid card than an SSD. The fact
> that it loses data after 16 hours without power is a little worrisome,
> although it uses a standard nimh battery so you can replace that with
> something that lasts a lot longer...
>
> Anyways, I'd be interested in hearing about anybody's experience with it.
>
> I'm thinking of using this for my md write intent bitmap and ext4
> journal, with "-o data=ordered" so close() and fsync() return as soon as
> the data hits the DIMMs -- no need to wait for the disk to rotate around.
>
> Any comments?
>
> So often I hear debates about "hardware raid" versus "software raid"
> which are actually debates over whether or not you ought to have some
> sort of battery-backed write cache around.
If I had one I might use it as a fs-cache.
> - a
>
> --
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--
Thomas Fjellstrom
tfjellstrom@shaw.ca
next prev parent reply other threads:[~2010-01-05 4:24 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-04 21:16 anybody using the gc-ramdisk? Adam Megacz
2010-01-05 4:24 ` Thomas Fjellstrom [this message]
2010-01-05 4:30 ` Adam Megacz
2010-01-05 4:34 ` fibre raid
2010-01-05 17:03 ` KELEMEN Peter
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