HP IO Accelerator for BladeSystem c-Class User Manual
Page 10
Introduction 10
•
Sufficient RAM to operate—The amount of RAM that the driver requires to manage the NAND flash
varies according to the block size you select when formatting the device (filesystem format, not low-level
format). For a virtual machine using an IO Accelerator directly (using PCI pass-through), consult the user
guide for the installed operating system. The following table lists the amount of RAM required per
100GB of storage space, using various block sizes. The amount of RAM used in driver version 3.0 is
significantly less than the amount used in version 1.2.x.
Average block size
(bytes)
RAM usage for each 80
GB IO Accelerator
(Megabytes)
RAM usage for each 100
GB IO Accelerator
(Megabytes)
Minimum system RAM
requirement for 320 GB
MezzIO Accelerator*
8,192
250
280
1 GB
4,096
400
530
1.6 GB
2,048
750
1,030
3 GB
1,024
1,450
2,000
5.8 GB
512
2,850
3,970
11.4 GB
Average block size
(bytes)
Minimum system RAM
requirement for 640 GB
MezzIO Accelerator*
Minimum system RAM
requirement for 785 GB
MezzIO Accelerator*
Minimum system RAM
requirement for 1.2 TB
MezzIO Accelerator*
8,192
2 GB
2.2 GB
3.4 GB
4,096
3.2 GB
4.2 GB
6.4 GB
2,048
6 GB
8.1 GB
12.4 GB
1,024
11.6 GB
15.7 GB
24 GB
512
22.8 GB
31.2 GB
47.6 GB
* For IO Accelerator use only. Additional RAM is needed for system operating system and applications.
HP PCIe IO Accelerator Duo requirements
In addition to the IO Accelerator cooling and RAM requirements listed in the previous table, the IO
Accelerator Duo requires at least:
•
A PCIe Gen1 x8 slot or a PCIe Gen2 x4 slot
•
A minimum of a full-height, half-length slot with a x8 physical connection. For systems with PCI 1.1, all
eight signaling lanes must be active for full IO Accelerator Duo performance. For systems with PCIe 2.0,
only four signaling lanes must be active for full performance.
NOTE:
With driver version 3.1.0 and later, the driver detects in the BIOS if the PCIe slot supports
a 75W power draw. If the slot supports up to 75W, the IO Accelerator device draws up to that
amount of power. However, if an external power cable is used, power is only supplied by that
cable.
To verify whether a slot is supplying 75W, view the system logs or use the fio-pci-check
utility.