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Figure 6 illustrates how each ME5084 storage array is divided into eight linear RAID 6 disk groups of ten drives each, with eight data and two parity disks per group. Each disk group is formatted with a chunk size of 128k and makes up a single storage target (ST), for a total of eight ST’s.
Each ST provides about 64 TB of formatted object storage space when populated with 8 TB HDDs. Since each array has 84 drives, after creating eight RAID-6 disk groups, we have 4 spare drives per array, 2 per tray, which are configured as global dynamic hot spares across the 8 disk groups in the array. For every disk group, a single volume using all the RAID’s capacity is created. As a result, a large base configuration as shown in Figure 2 has a total of 32 linear RAID 6 volumes across four ME5084 storage arrays. Each of these RAID 6 volumes is configured as an ST for the BeeGFS file system, resulting in a total of 32 STs across the file system in the base large configuration.
The STs are presented to clients via InfiniBand HDR connections. From any compute node that is equipped with the BeeGFS client, the entire namespace can be mounted, accessed, and managed like any other local file system.