https://community.hpe.com/t5/netservers/netraid-4m/m-p/2673331#M1591 Hi,<BR /><BR />I can not help you with numbers but i know this rule:<BR /><BR />more than 4-5 disks in one SCSI-chain might decrease performance because the SCSI-chain might be overloaded. <BR /><BR />One SCSI chain is a Single Point Of Faillure (SPOF) why? <BR /><BR />Hope this will help,<BR /><BR />Gideon<BR /><BR /><BR /><BR /><BR /> Fri, 01 Mar 2002 14:26:00 GMT G. Vrijhoeven 2002-03-01T14:26:00Z https://community.hpe.com/t5/netservers/netraid-4m/m-p/2673330#M1590 I have a win2000 cluster based on 2 lt6000r, with an external rs/12 and netraid 4m scsi controllers. I have 4 discs to hold data, and another 4 discs to mirror the data discs. Since the rs/12 only permits two connections, I have all discs (data and mirror) on the same channel. What I would like to know is if this can cause any kind of performance bottleneck in disc access, for I have the data and the mirror on the same channel, which possibly means the system cannot write to both discs at the same time - am I right about this?<BR />If so, I'd like to knwo how can I test the performence degradation I'm now experiencing - how can I disconnect the mirror to see the performance I'll get without it, and how can I later redo the mirror.<BR /><BR />Thanks Thu, 28 Feb 2002 10:50:17 GMT https://community.hpe.com/t5/netservers/netraid-4m/m-p/2673330#M1590 Alexandre Fortuna 2002-02-28T10:50:17Z https://community.hpe.com/t5/netservers/netraid-4m/m-p/2673331#M1591 Hi,<BR /><BR />I can not help you with numbers but i know this rule:<BR /><BR />more than 4-5 disks in one SCSI-chain might decrease performance because the SCSI-chain might be overloaded. <BR /><BR />One SCSI chain is a Single Point Of Faillure (SPOF) why? <BR /><BR />Hope this will help,<BR /><BR />Gideon<BR /><BR /><BR /><BR /><BR /> Fri, 01 Mar 2002 14:26:00 GMT https://community.hpe.com/t5/netservers/netraid-4m/m-p/2673331#M1591 G. Vrijhoeven 2002-03-01T14:26:00Z