Message-ID: <519D769B.1030406@2ndQuadrant.com>
Date: Wed, 22 May 2013 21:53:31 -0400
From: Greg Smith <greg@2ndQuadrant.com>
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7;
	rv:14.0) Gecko/20120713 Thunderbird/14.0
MIME-Version: 1.0
To: Merlin Moncure <mmoncure@gmail.com>
CC: "Joshua D. Drake" <jd@commandprompt.com>, sthomas@optionshouse.com,
	Tomas Vondra <tv@fuzzy.cz>, pgsql-performance@postgresql.org
Subject: Re: Reliability with RAID 10 SSD and Streaming Replication
References: 
 <CAAE-9WHMycEZOB5J6HKME5AZLEdL2hYF+FV8hzbLksJinq=EJg@mail.gmail.com>
	<51957499.6050905@fuzzy.cz> <519991EB.8010208@2ndQuadrant.com>
	<519A8E29.60702@fuzzy.cz>
	<CAHyXU0wvW-USgbkXAYEHLG2fHgj=UdZi1aCFoVWBMQEsOFZy+A@mail.gmail.com>
	<519C0EFD.9080002@2ndQuadrant.com>
	<CAHyXU0ymFT7Sqw77yPryGWKEpjV4Wv9Vkc21vGtPKo0GZWGg8A@mail.gmail.com>
	<519CF8CC.1030204@optionshouse.com>
	<519D0921.9080807@2ndQuadrant.com>
	<519D174A.4050703@commandprompt.com>
	<519D1CD6.2080607@2ndQuadrant.com>
	<CAHyXU0wUHDiGVWgejxsFNApiP0sUcf8eLOy1Dwy-1pboBuxLeQ@mail.gmail.com>
	<519D2562.2060604@2ndQuadrant.com>
	<CAHyXU0zvTu9tkROKBHbUFqSH1oxgqVGWsKBX4wjem4X-XXCGzw@mail.gmail.com>
In-Reply-To: 
 <CAHyXU0zvTu9tkROKBHbUFqSH1oxgqVGWsKBX4wjem4X-XXCGzw@mail.gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Precedence: bulk
Sender: pgsql-performance-owner@postgresql.org

On 5/22/13 4:57 PM, Merlin Moncure wrote:
> Oh, the major vendors will still keep their
> rip-off going on a little longer selling their storage trays, raid
> controllers, entry/mid level SANS, SAS HBAs etc at huge markup to
> customers who don't need them (some will still need them, but the bar
> suddenly just got spectacularly raised before you have to look into
> enterprise gear).

The angle to distinguish "enterprise" hardware is moving on to error 
related capabilities.  Soon we'll see SAS drives with the 520 byte 
sectors and checksumming for example.

And while SATA drives have advanced a long way, they haven't caught up 
with SAS for failure handling.  It's still far too easy for a single 
crazy SATA device to force crippling bus resets for example.  Individual 
SATA ports don't expect to share things with others, while SAS chains 
have a much better protocol for handling things.

-- 
Greg Smith   2ndQuadrant US    greg@2ndQuadrant.com   Baltimore, MD
PostgreSQL Training, Services, and 24x7 Support www.2ndQuadrant.com


-- 
Sent via pgsql-performance mailing list (pgsql-performance@postgresql.org)
To make changes to your subscription:
http://www.postgresql.org/mailpref/pgsql-performance