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ServeRAID M5120 SAS/SATA Controller for Lenovo System x


81Y4478 (Lenovo / Server Accessory)

SKU: 81Y4478 Category:


The ServeRAID M5120 SAS/SATA controller is optimized for high-performance external data storage with integration of dual-core chip architecture, DDR3 1333 MHz cache memory, and PCIe 3.0 host interface. A portfolio of building blocks allows clients to design around a bottoms-up approach and caters to a wide array of storage requirements.

Auto-resume on array rebuild or array reconstruction after loss of system power
Auto-resume uses non-volatile NVRAM to save rebuild progress during a host reboot or power failure to automatically resume from the last checkpoint. Auto-resume ensures that data integrity is maintained through the process. The card supports a number of features that are able to be implemented without rebooting the server. Applications such as email and web server benefit from avoiding downtime during transition.

Online Capacity Expansion
Online Capacity Expansion (OCE) allows the capacity of a virtual disk to be expanded by adding new physical disks or making use of unused space on existing disks, without requiring a reboot.

Online RAID level migration
Online RAID level migration provides the ability to migrate a virtual disk from any RAID level to any other RAID level without requiring a reboot. System availability and application functionality remain unaffected.

Fast initialization for quick array setup
Fast initialization quickly writes zeroes to the first and last sectors of the virtual drive. This allows you to immediately start writing data to the virtual drive while the initialization is running in the background.

Consistency check for background data integrity
Consistency check verifies that all stripes in a virtual disk with a redundant RAID level are consistent. The consistency check will mirror data when an inconsistent stripe is detected for a RAID 1 and recreate the parity from the peer disks in the case of a RAID 5 or RAID 6. Consistency checks can be scheduled to take place periodically.

Single controller multi-pathing (failover) I/O load balancing
The ServeRAID’s firmware detects and uses multiple paths from the controllers to the SAS drives that are in enclosures. With redundant paths to the same port of a device, if one path fails, another path can be used to communicate between the controller and the drive. Using multiple paths with load balancing, instead of a single path, can increase reliability through redundancy.




Lenovo is a public company which is in the industry of computer hardware and electronics services. The company was founded in November 1, 1984 under the name Legend in Beijing China. The company has two headquarters, one located in Haidian District, Beijing, China and the other located in Morrisville, North Carolina, United States. Their website is The chairman and CEO of the company is Yang Yuanqing. The products which the company markets are smart phones, tablet computers, storage devices, television, printers, scanners, netbooks, desktops, servers, notebooks and peripherals. In the year 2016, Lenovo generated a revenue of US $44.91 billion but had a net income of US $-128.1 million in the same year. In that same year, 2016, they had a total number of 60,000 employees. The company’s parent company with 30% of its assets is Legend Holdings.