[HPADM] RAID 4Si Card

From: Johnson, Craig E (craig.johnson_at_siemens.com)
Date: 07/29/04

  • Next message: Hall, Mary Ellen: "[HPADM] Hardware support contracts" 
    To: hpux-admin@DutchWorks.nl
Date: Thu, 29 Jul 2004 10:31:43 -0700

    Anyone have experience with this? I have one with a single channel attached
    to a DS2300 with seven drives configured in RAID 5 fully populating ½ of the
    split bus. The system is an rp5470 with two CPU's. The performance is
    horrendous. I know there are write penalties associated with RAID 5 but
    this is ridiculous. We run RAID 5 elsewhere with much better results.

    If I were to populate the other side of the DS2300, use another channel from
    the 4Si card to access it, and stripe my LV's across the two LUNs, what
    performance increase do you think I'd see? Any? Since the 4Si occupies a
    single PCI slot, is the throughput going to be limited by the backplane
    bandwidth? Or am I going to effectively double my Ultra SCSI bandwidth?

    Thanks in advance.

    Craig 

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