Dell POWEREDGE R720 User Manual
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Timed Workload Media Wear rate of 0.620% for every 1367 minutes:
– Workload Media Wear Rate 0.027% per hour
– Workload Media Wear Rate 0.653% per day
Using the drive in this 100% workload example, the drive wears at .653% per day.
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100/.653 = 153
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In this exaggerated case, the drive will use 100% of wear in 153 days
NOTE: This sample usage case is an exaggerated workload of 100% writes. The wear rate and related values for
this device's intended use in read-intensive environments will be notably different, with the wear rates markedly
lower. The above workload was used in this case to demonstrate the procedure and calculations.
Adjusting SSD Usable Capacity to Improve Drive Performance
Some SSD performance gains can be realized in random write performance and endurance by configuring a small
reduction in the drive's usable capacity. Intel provides details on this option in
Intel Solid-State Drive 320 Series in
Server Storage Applications
at http://www.intel.com.
NOTE: If you wish to implement this feature, you must do so before the drive is initialized or written to in any way.
After the drive contents are altered, secure erasure of the drive to change its usable capacity is not supported.
Intel 320 SSD ATA Instant Secure Erase Functionality
Intel 320 SSDs support cryptography-based Instant ATA secure erase functionality. The Intel 320 SSD Instant ATA
secure ease feature is non-TCG (Trusted Computing Group) based. It supports two modes of crypto secure erase:
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Normal secure erase—Clears the encryption keys and erases NAND
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Enhanced secure erase—Generates new keys and clears NAND.
The PERC solution only supports the “crypto erase” function on TCG-compliant Enterprise SED (Self Encrypting Drive)
drives.
When an Intel 320 drive is connected to a PERC, there is an incompatibility between PERC TCG method of crypto erase
and Intel 320 supported non-TCG based ATA instant secure erase. As a result, the instant secure erase functionality
can’t be used with PERC based solution.
The only way to run instant ATA secure ease and use Intel 320 drive secure wiping feature is to connect the drives
directly into the motherboard chipset’s ATA port and issue secure erase command. Intel provides a free utility (Intel SSD
Toolbox) to instant secure erase the drive, which you can download from
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