ThinkSystem 3.5" PM1645 1.6TB Mainstream SAS 12Gb Hot Swap SSD
Lenovo 4XB7A13658. SSD capacity: 1600 GB, SSD form factor: 3.5", Read speed: 1000 MB/s, Write speed: 1200 MB/s, Data transfer rate: 12 Gbit/s, Component for: Server/workstation
ThinkSystem PM1645 Mainstream SAS 12Gb SSDs The ThinkSystem PM1645 Mainstream SAS 12Gb solid-state drives (SSDs) in capacities of up to 3.2 TBare next-generation high-performance SSDs suitable for a wide range of applications of running onThinkSystem servers. The PM1645 Mainstream SAS 12Gb SSD is shown in the following figure.
Entry SSDs and Mainstream SSDs have similar read and write IOPS performance, but the key differencebetween them is their endurance (or lifetime) (that is, how long they can perform write operations becauseSSDs have a finite number of program/erase (P/E) cycles). Mainstream SSDs have better endurance butlower cost/IOPS ratio compared to Entry SSDs. SSD write endurance is typically measured by the numberof program/erase (P/E) cycles that the drive incurs over its lifetime, listed as the total bytes of written data(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 ofP/E cycles) that a drive can be guaranteed to complete (% of remaining P/E cycles = % of remainingTBW). Reaching this limit does not cause the drive to immediately fail. It simply denotes the maximumnumber of writes that can be guaranteed. A solid-state device will not fail upon reaching the specifiedTBW. At some point based on manufacturing variance margin, after surpassing the TBW value, the drivewill reach the end-of-life point, at which the drive will go into a read-only mode.
For example, the 1.6TB PM1645 SSD has an endurance of 8,760 TB of total bytes written (TBW). Thismeans that for full operation over five years, write workload must be limited to no more than 4,800 GB ofwrites per day, which is equivalent to 3.0 full drive writes per day (DWPD). For the device to last threeyears, the drive write workload must be limited to no more than 8,000 GB of writes per day, which isequivalent to 5.0 full drive writes per day.
General Information
Manufacturer
Lenovo Group Limited
Manufacturer Part Number
4XB7A13658
Manufacturer Website Address
http://www.lenovo.com/us/en/
Brand Name
Lenovo
Product Series
PM1645
Product Name
ThinkSystem 3.5" PM1645 1.6TB Mainstream SAS 12Gb Hot Swap SSD
Product Type
Solid State Drive
UPC
0889488475483
Storage
Drive Type
Internal
Warranty
Limited Warranty
1 Year
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