Thinking Machines Corporation, Cambridge, MA. CM-5 Scalable Disk Array Fact Sheet, 1992. 30  Home/Search   Document Not in Database   Summary   Related Articles

....contains eight drives as described above. In the smallest configuration CM 5 with 32 processing nodes, there can be from one to three I O nodes, meaning 8, 16, or 24 gigabytes of disk space. For larger machines, the SDA system of disk I O scales up to 3. 2 Terabytes, which requires 384 I O nodes [14]. An example of a system with two I O nodes and single parity drive is given in Figure 5. Data being written to (or read from) the SDA are striped across the data disks of the array [13] A single stripe of data on the CM 5 consists of 16 bytes of data written onto each disk. A data block is the ....

....of whether the data is read or written, in both cases there is always a need for message passing among the nodes to perform data reordering, guaranteeing the availability of the data in sequential order. Data reordering is also supported by specialpurpose hardware on the I O control processors [14]. The rate obtained for sustained reading is approximately 7.8 MB sec, and for sustained write the rate is around 10.5 MB sec. The given rating for sustained I O operations is 12 MB sec per I O node [14] Because the tested machine has two I O nodes, there should yield a 24 MB sec rate for ....

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Thinking Machines Corporation, Cambridge, MA. CM-5 Scalable Disk Array Fact Sheet, 1992. 30

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