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Re: Hardware vs Software RAID

From: Vivek Khera <vivek(at)khera(dot)org>
To: Pgsql performance <pgsql-performance(at)postgresql(dot)org>
Subject: Re: Hardware vs Software RAID
Date: 2008-06-26 13:43:03
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Jun 25, 2008, at 11:35 AM, Matthew Wakeling wrote:

> On Wed, 25 Jun 2008, Greg Smith wrote:
>> A firewire-attached log device is an extremely bad idea.
> Anyone have experience with IDE, SATA, or SAS-connected flash  
> devices like the Samsung MCBQE32G5MPP-0VA? I mean, it seems lovely -  
> 32GB, at a transfer rate of 100MB/s, and doesn't degrade much in  
> performance when writing small random blocks. But what's it actually  
> like, and is it reliable?

None of these manufacturers rates these drives for massive amounts of  
writes.  They're sold as suitable for laptop/desktop use, which  
normally is not a heavy wear and tear operation like a DB.  Once they  
claim suitability for this purpose, be sure that I and a lot of others  
will dive into it to see how well it really works.  Until then, it  
will just be an expensive brick-making experiment, I'm sure.

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