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IBM SATA 1.8-inch and 2.5-inch MLC Enterprise Value SSDs 3

Technical specifications

Table 2 presents technical specifications for the Enterprise Value solid-state drives.

Table 2. Enterprise Value SSD technical specifications

Feature 64 GB 128 GB 256 GB 512 GB

Part number 49Y5834 49Y5839 49Y5849 00W1222 90Y8648 90Y8668 00W1227 90Y8643 90Y8663 49Y5993 49Y5844 49Y5854

Interface 6 Gbps

SATA

6 Gbps

SATA

6 Gbps

SATA

6 Gbps

SATA

6 Gbps

SATA

6 Gbps

SATA

6 Gbps

SATA

6 Gbps

SATA

6 Gbps

SATA

6 Gbps

SATA

6 Gbps

SATA

6 Gbps

SATA

Hot-swap

drive

Yes§ Yes No Yes§ Yes No Yes§ Yes No Yes§ Yes No

Form factor 1.8-inch 2.5-inch 2.5-inch 1.8-inch 2.5-inch 2.5-inch 1.8-inch 2.5-inch 2.5-inch 1.8-inch 2.5-inch 2.5-inch

Capacity 64 GB 64 GB 64 GB 128 GB 128 GB 128 GB 256 GB 256 GB 256 GB 512 GB 512 GB 512 GB

Endurance 36 TB 36 TB 36 TB 72 TB 72 TB 72 TB 175 TB 175 TB 175 TB 350 TB 350 TB 350 TB

IOPS read* 50,000 50,000 50,000 50,000 50,000 50,000 50,000 50,000 50,000 50,000 50,000 50,000

IOPS write* 7,000 7,000 7,000 7,500 7,500 7,500 7,500 7,500 7,500 7,500 7,500 7,500

Sequential

read rate†

350

MBps

350

MBps

350

MBps

350

MBps

350

MBps

350

MBps

350

MBps

350

MBps

350

MBps

350

MBps

350

MBps

350

MBps

Sequential

write rate†

100

MBps

100

MBps

100

MBps

140

MBps

140

MBps

140

MBps

140

MBps

140

MBps

140

MBps

140

MBps

140

MBps

140

MBps

Read latency 0.5 ms 0.5 ms 0.5 ms 0.5 ms 0.5 ms 0.5 ms 0.5 ms 0.5 ms 0.5 ms 0.5 ms 0.5 ms 0.5 ms

Write latency 3.5 ms 3.5 ms 3.5 ms 3.5 ms 3.5 ms 3.5 ms 3.5 ms 3.5 ms 3.5 ms 3.5 ms 3.5 ms 3.5 ms

Shock,

operating

1500 G/

1.0 ms

1500 G/

1.0 ms

1500 G/

1.0 ms

1500 G/

1.0 ms

1500 G/

1.0 ms

1500 G/

1.0 ms

1500 G/

1.0 ms

1500 G/

1.0 ms

1500 G/

1.0 ms

1500 G/

1.0 ms

1500 G/

1.0 ms

1500 G/

1.0 ms

Vibration,

operating

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

2–500Hz

at 3.1 G

§ This SSD can be a hot-swap or non-hot-swap drive depending on a server in which it is installed.

* 4 KB block transfers

† 128 KB block transfers

Enterprise Value SSDs and Enterprise SSDs have similar read and write IOPS performance, but the key

difference between them is their endurance (or life time) (that is, how long they can perform write

operations because SSDs have a finite number of program/erase (P/E) cycles). Enterprise Value SSDs

have a better cost/IOPS ratio but lower endurance compared to Enterprise SSDs. SSD write endurance is

typically measured by the number of program/erase (P/E) cycles, that the drive incurs over its lifetime,

listed as TBW in the device specification.

The TBW value assigned to a solid-state device is the total bytes of written data (based on the number of

P/E cycles) that a drive can be guaranteed to complete (% of remaining P/E cycles = % of remaining

TBW). Reaching this limit does not cause the drive to immediately fail. It simply denotes the maximum

number of writes that can be guaranteed. A solid-state device will not fail upon reaching the specified

TBW. At some point based on manufacturing variance margin, after surpassing the TBW value, the drive

will reach the end-of-life point, at which the drive will go into a read-only mode. Because of such behavior

by Enterprise Value solid-state drives, careful planning must be done to use them only in read-intensive

environments to ensure that the TBW of the drive will not be exceeded prior to the required life

expectancy.

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