TS7770 with 3956-XSB Cache Expansion Enclosure
The TS7700 Cache Drawer acts as an expansion unit for the TS7700 Cache Controller, and collectively both are referred to as the TS7700 Cache.
- TS7770 Cache Drawer
- The drives used for CSB and its attached XSB will be 10TB NL-SAS 7.2k RPM normal drives.
CSB controllers will only support XSB expansion drawers which contain the same size drives as are in the CSB.
The CSB and corresponding XSB drawers will support encryption abilities, as before, including internal key management and external key management.
See Capacity on Demand, for a list of the available disk cache capacity options.
- TS7760 Cache Drawer
- Each TS7760 Cache Drawer contains 12 DDMs, which in turn each have a raw capacity of 8 TB or 4
TB.
4 TB Disk Drive Capacity Configurations
Total usable capacity per drawer is approximately 31 TB (28.29 TiB) when used with dynamic disk pool formatting.
The base TS7760 Cache (contained by the TS7760 Base Frame) can be configured to contain up to nine TS7760 Cache Drawers attached to one TS7760 Cache Controller. Fully configured, the base TS7760 Cache has a total usable capacity of 313.96 TB (285.55 TiB). Table 1 displays the storage capacities of a base TS7760 Cache Controller with a range of TS7760 Cache Drawer configurations with 4 TB DDMs.
Table 1. Base Cache configurations and capacities with 4 TB drives. Table describes the configurations and capacities of the base Cache. Number of TS7760 Cache Controllers (3956-CSA) Number of TS7760 Cache Drawers (3956-XSA) using 4 TB drives Raw capacity Usable (available) capacity 1 0 48 TB
(43.65 TiB)31.11 TB
(28.29 TiB)1 96 TB
(87.33 TiB)62.53 TB
(56.87 TiB)2 144 TB
(130.99 TiB)93.96 TB
(85.46 TiB)3 192 TB
(174.66 TiB)125.39 TB
(114.04 TiB)4 240 TB
(218.32 TiB)156.82 TB
(142.63 TiB)5 288 TB
(261.99 TiB)188.25 TB
(171.21 TiB)6 336 TB
(305.65 TiB)219.68 TB
(199.79 TiB)7 384 TB
(349.31 TiB)251.10 TB
(228.38 TiB)8 432 TB
(392.98 TiB)282.53 TB
(256.96 TiB)9 480 TB
(436.64 TiB)313.96 TB
(285.55 TiB)Note: The raw capacity that is shown is the storage capacity before any formatting takes place. The formatted capacity is the storage capacity after the 3956-CSA/XSA initializes the drive(s). The usable capacity is the storage capacity available for customer use inside a GPFS file system after the formatted disks are divided into logical unit numbers (LUNs) inside a dynamic disk pool.8 TB Disk Drive Capacity Configurations
Total usable capacity per drawer is approximately 61.55 TB (55.98 TiB) when used with dynamic disk pool formatting.
The base TS7760 Cache (contained by the TS7760 Base Frame) can be configured to contain up to nine TS7760 Cache Drawers attached to one TS7760 Cache Controller. Fully configured, the base TS7760 Cache has a total usable capacity of 618.12 TB (562.16 TiB). Table 2 displays the storage capacities of a base TS7760 Cache Controller with a range of TS7760 Cache Drawer configurations with 8 TB DDMs.
Table 2. Base Cache configurations and capacities with 8 TB drives. Table describes the configurations and capacities of the base Cache. Number of TS7760 Cache Controllers (3956-CSA) Number of TS7760 Cache Drawers (3956-XSA) using 8 TB drives Raw capacity Usable (available) capacity 1 Note: The raw capacity that is shown is the storage capacity before any formatting takes place. The formatted capacity is the storage capacity after the 3956-CSA/XSA initializes the drive(s). The usable capacity is the storage capacity available for customer use inside a GPFS file system after the formatted disks are divided into logical unit numbers (LUNs) inside a dynamic disk pool.0 96 TB
(87.33 TiB)61.55 TB
(55.98 TiB)1 192 TB
(174.66 TiB)123.39 TB
(112.22 TiB)2 288 TB
(261.99 TiB)185.23 TB
(168.47 TiB)3 384 TB
(349.31 TiB)247.07 TB
(224.71 TiB)4 480 TB
(436.64 TiB)308.91 TB
(280.96 TiB)5 576 TB
(523.87 TiB)370.76 TB
(337.20 TiB)6 672 TB
(611.18 TiB)432.60 TB
(393.44 TiB)7 768 TB
(698.49 TiB)494.44 TB
(449.69 TiB)8 864TB
(785.803 TiB)556.28 TB
(505.93 TiB)9 960 TB
(873.115 TiB)618.12 TB
(562.16 TiB)Note: The raw capacity that is shown is the storage capacity before any dynamic disk pool RAID or file system formatting takes place. The usable capacity is the storage capacity available for customer use after the raw capacity has dynamic disk pool RAID6 formatting applied. Roughly 20% of the capacity is reserved for disk failure rebuild, a minimal amount of capacity set aside for TS7700 use and any file system formatting overhead.