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Very slow installation Windows Server 2008 on PowerEdge R900

Hello Guys,

I have a problem with installation new system on R900. Its takes about 3-4 hours.
After installation system performance is very low.
OS is installed on RAID 1 (Perc 6/i) but by Qlogic card i have connected 100 another disks which I cane view on installation screen.

I try to install another system, but is the same. I delete RAID and then create RAID 1 - still the same.
I used SUUB, but without success.

Has anyone has simillar problem?

Before this installation ws2k8r2 Ent core was installed and everything was ok.

Thanks for help,

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