[CentOS] Poor RAID performance new Xeon server?

Stewart Williams lists at pinkyboots.co.uk
Sun Jan 11 20:38:46 UTC 2009

John R Pierce wrote:
> Stewart Williams wrote:
>> John R Pierce wrote:
>>> Stewart Williams wrote:
>>>> The block I/O is the thing that concerns me as mostly I am serving a 
>>>> 650MB file via samba to 5 clients and I think this is where I need the 
>>>> speed.
>>> is this a sequential or random access application thats using this 
>>> file?   is it read only/mostly, or is it random update?
>> I'm not sure, how can I find this out?
> well, what is the nature of the application thats using this file?     
> do you really mean just a single 650MB (sub 1GB) file?
> is this something like a quickbooks file? (thats kind of what it sounds 
> like from your other answers).

It is indeed a quickbooks file. The file is currently at 645MB and grows 
about 20MB per week.

> given what you have now, and what information we've been given, I would
>     A) disable BIOS raid, configuring it for JBOD w/ ACHI enabled
>     B) mdadm mirror disks 0 and 1, and put the OS on that
>     C) mdadm mirror disks 2 and 3, and put your shared SMB filesystem on 
> that

Is that a better choice than RAID 1+0?

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