[CentOS] Software Raid 6

Juan C. Valido jvalidolnx at juanyjosefina.com
Sun Sep 16 14:33:20 UTC 2007

-----Original Message-----
From: centos-bounces at centos.org [mailto:centos-bounces at centos.org] On Behalf
Of Feizhou
Sent: Sunday, September 16, 2007 9:35 AM
To: CentOS mailing list
Subject: Re: [CentOS] Software Raid 6

Feizhou wrote:
> Juan C. Valido wrote:
>> How slow and how reliable is software raid 6 on CentOS 5. The system I'm
>> going to use is A socket 939 dual core Athlon, 4 gigs of ram and a 3ware
>> 7506-8 controller. Its mostly going to be used for storage (Movies, MP3s
>> etc.). Thanks.

Argh...just read the SOFTWARE RAID 6. Man, does the 3ware turn me into 
hardware mode...

I do not know...I personally have stayed away from linux software raid 
for raid5/6. You might actually find raid10 hardware mode to be faster 
than software raid 5/6 but at the cost of less storage and but better 
reliability in power loss cases.

> The 7506 does not have any cache. Its ASIC chips have very limited 
> storage. You are far better off running in raid10 with the 75xx and 85xx 
>  series. Those cards are especially slow when you get a degraded array 
> in raid5 or raid6 (not sure if the 75xx or the 85xx support raid6) mode 
> due to the lack of cache.
> So you get the benefit of multiple spindles but I personally will not 
> use anything but raid1 or raid10 with a 75xx or 85xx series 3ware board.
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Thanks, that's what I'm running now, I guess I'll add more space elsewhere.

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