From: Tena Sakai <tsakai@gallo.ucsf.edu>
To: Craig James <craig_james@emolecules.com>, "pgsql-admin@postgresql.org"
	<pgsql-admin@postgresql.org>
Date: Tue, 7 Sep 2010 13:47:11 -0700
Subject: Re: [NOVICE] - SAN/NAS/DAS - Need advises
Thread-Topic: [ADMIN] [NOVICE] - SAN/NAS/DAS - Need advises
Thread-Index: ActOxAFIYxQSLE2eRLGkRaY2tuNTEQACdbCP
Message-ID: <C8ABF2DF.C419%tsakai@gallo.ucsf.edu>
In-Reply-To: <4C869432.3020604@emolecules.com>
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Hi everybody,

I have been reading this thread and I got the idea that
SANs to avoid, but would somebody please give a bit of
Comparison/perspective on NAS?

Regards,

Tena Sakai
tsakai@gallo.ucsf.edu


On 9/7/10 12:36 PM, "Craig James" <craig_james@emolecules.com> wrote:

> On 9/7/10 12:06 PM, Jesper Krogh wrote:
>> On 2010-09-07 20:42, Scott Marlowe wrote:
>>> With the right supplier, you can plug in literally 100 hard drives to
>>> a regular server with DAS and for a fraction of the cost of a SAN.
>> Ok, recently I have compared prices a NexSan SASBeast with 42 15K SAS dr=
ives
>> with a HP MDS600 with 15K SAS drives.
>>=20
>> The first is 8gbit Fibre Channel, the last is 3Gbit DAS SAS. The
>> fibre channel version is about 20% more expensive pr TB.
>>=20
>> So of course it is a "fraction of the cost of a SAN", but it is a
>> fairly small one.
>=20
> Are you really comparing equal systems?  "8gbit Fibre Channel" means a si=
ngle
> Fibre Channel shared by 42 disks, whereas "3GBit DAS SAS" means 42 3gbit
> channels running in parallel.  It seems like you'd really need some reali=
stic
> benchmarks that emulate your actual server load before you'd know how the=
se
> two systems compare.
>=20
> Craig
>=20