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Re: RAID card recommendation

From: Ben Chobot <bench(at)silentmedia(dot)com>
To: Matthew Wakeling <matthew(at)flymine(dot)org>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: RAID card recommendation
Date: 2009-11-24 17:55:00
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Nov 24, 2009, at 9:23 AM, Matthew Wakeling wrote:

> We're about to purchase a new server to store some of our old  
> databases, and I was wondering if someone could advise me on a RAID  
> card. We want to make a 6-drive SATA RAID array out of 2TB drives,  
> and it will be RAID 5 or 6 because there will be zero write traffic.  
> The priority is stuffing as much storage into a small 2U rack as  
> possible, with performance less important. We will be running Debian  
> Linux.
> People have mentioned Areca as making good RAID controllers. We're  
> looking at the "Areca ARC-1220 PCI-Express x8 SATA II" as a  
> possibility. Does anyone have an opinion on whether it is a turkey  
> or a star?

We've used that card and have been quite happy with it. Looking  
through the release notes for firmware upgrades can be pretty worrying  
("you needed to fix what?!"), but we never experienced any problems  
ourselves, and its not like 3ware release notes are any different.

But the main benefits of a RAID card are a write cache and easy hot  
swap. It sounds like you don't need a write cache. Can you be happy  
with the kernel's hotswap ability?

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