HP Surestore Disk Array FC60 HP SureStore E Disk Array FC60 Service Manual (A5 - Page 72
additional full-bus con d disk enclosures can be added to the array. The system should
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another, two or one disk enclosures, respectively, can be added by using split-bus mode. However, if you are adding up to four, five, or six enclosure, the enclosures configuration will need to be switched from split-bus to full-bus (refer to "Disk Enclosure Bus Configuration" section, earlier in this chapter, for additional information). Note Typically adding only one enclosure does not provide any options for creating volume groups. It is best to expand the array with at least a minimum of two disk enclosures at a time. Two additional drives could then be configured as RAID 1 or 0/1. Installing a five disk enclosure array limits expansion to six disk enclosures. Adding one additional enclosure does not provide any versatility for creating volume groups (unless all data is removed and the volume groups are rebuilt). If the initial installation uses split-bus disk enclosure (split-bus accepts three disk enclosures maximum) and expansion requires adding four or more enclosures, the existing disk enclosures will need to be reconfigured for full-bus mode and the additional number of enclosures installed into the rack and required number of full-bus enclosures. This expansion requires disk enclosures be recabled using full bus enclosures. As in all cases of adding disk enclosures to the array, the system has to be shut down for the expansion. Determine the RAID level and how the volume groups will be created for the expansion If the initial installation consisted of one or more full-bus configured disk enclosures, then additional full-bus configured disk enclosures can be added to the array. The system should be shut down for the addition of the enclosures. Determine the RAID level and how the volume groups will be created for the additional storage. To scale up sequential performance, first make sure that the configuration includes both controllers modules. Maximum sequential transfer performance will be reached with approximately 20 disk modules simultaneously transferring data. To achieve additional sequential transfer performance, you will need to add a second disk array and more disk modules. To increase I/Os per second performance, add disk modules. Transaction performance is directly related to the number of disk modules installed in the disk array. 72 Array Design Considerations