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Re: RAID 5 with 3Ware IDE



Hi Ariel,

I'm not sure I'm understanding you.

Just for clarification: 3Ware hardware RAID card is a card that is using EIDE 
hard drives instead of SCSI, with each IDE got it's own processor (on the 
card), DMA channels and in some models - caching. Thats what I'm talking 
about.

>    Is performance an issue ?  Use NFSv3, and mount with a blocksize of
> 16k (unless your switches deal with larger blocksizes well - Network
> Appliance have a fairly well documented case of switches not dealing well
> with >16k udp blocksize for NFS).

Linux kernel NFS V3? is it stable? faster then NFS V2?

I didn't understand how you tie the ethernet switch with the block size. it's 
a 100 MBit switch and all the machines are equipped with Intel 100 MBit 
cards..

>
>    About performance, 60GB disks with 7200rpm, using raid5, will result in
> performance problems. If you are going to mount this using 100Mbit over a
> few NFS clients, that use the file-server you create intensively for reads
> and writes, you may find yourself bottlenecked...

If it's hard disk got it's own controller (processor on the card) and DMA 
channel (I'm not talking about those cheap RAID solutions like HPT's one or 
Promise 2 hard drives solution), why would I have those problems?

>
> --Ariel

Thanks,
Hetz

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