Re: Performance question, RAID5

From: Roberto Spadim <roberto@spadim.com.br>
To: John Robinson <john.robinson@anonymous.org.uk>
Cc: "Mathias Burén" <mathias.buren@gmail.com>,
	Linux-RAID <linux-raid@vger.kernel.org>
Subject: Re: Performance question, RAID5
Date: Tue, 1 Feb 2011 11:53:25 -0200	[thread overview]
Message-ID: <AANLkTim6+skZphsQSYYDPWS1iwYekvb6ATKkzsV+0EDw@mail.gmail.com> (raw)
In-Reply-To: <4D47F086.9000308@anonymous.org.uk>

if money isn´t a problem, buy only ssd =) they have ecc, faster
read/write, less latency, and a bigger MTBF (they are better!) and
they broken too, replace every 5 years to don´t have problems with
loose of information

2011/2/1 John Robinson <john.robinson@anonymous.org.uk>:
> On 30/01/2011 12:12, Mathias Burén wrote:
> [...]
>>
>> Ah, good point. The sda is a 60GB SSD, I should definitely move that
>> to the PCI-E card, as it doesn't do heavy IO (just small random r/w).
>> Then i can have 4 RAID HDDs on the onboard ctrl, and 2 on the PCI-E
>> shared with the SSD. If the SSD is idle then I should get ideal
>> throughputs.
>
> Hmm, if you have an SSD, you might look at using bcache to speed up write
> access to your array. On the other hand, with only one SSD you potentially
> lose redundancy - do SSDs crash and burn like hard drives do?
>
> If the SSD is only being used as a boot/OS drive - so near idle in normal
> use - I'd swap it for a cheap small laptop hard drive and find somewhere
> else to put the SSD to better use.
>
> Cheers,
>
> John.
>
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-- 
Roberto Spadim
Spadim Technology / SPAEmpresarial
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