Dell PowerEdge Express Flash PCIe SSD, User Manual

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I/O Device Error On Write To PCIe SSD
Cause PCIe SSDs have a finite number of write cycles, when a PCIe SSD exhausts the number of
writes it goes in to the Write Protect mode (Read Only).
Description
Windows event log may report the following entries on the first write attempt to a PCIe SSD:
•
Event ID 11: The driver detected a controller error on
\Device\Ide\IdePort#
•
Event ID 7: Device in Write-Protect Mode
Linux messages log may report the following entries on a write attempt to a PCIe SSD:
•
Taskfile error (40000000): attempting recovery...
•
restartPort: Issuing COM reset Write protect bit set
•
Fail: write w/tag 1 write protect
•
EH tags failed: [2 tags]
VMware kernel log may report the following entries:
•
scsiExecReadWriteCommand:Failure—drive has reached End of
Life and has gone into Write Protect
•
scsiExecReadWriteCommand:IO Failed—drive is in write
protect mode, EOL value=100
Solution By using OpenManage Server Administrator, you may check the PCIe SSD state to confirm if
the PCIe SSD is in Read-Only Mode. Alternatively, you can boot into the HII and do the same.
For further instructions, contact a Dell Technical Service representative.
PCIe SSD Performance Measurement Not Optimal
Cause PCIe SSD has not been pre-conditioned and/or BIOS settings are not optimal.
Description There are a number of factors that may alter the performance of a PCIe SSD. It is
recommended to take basic setup measures to ensure performance optimization of these
devices.
Solution
• Without pre-conditioning the PCIe SSD, performance measurements can be
misleading as it may not reflect long term performance of the device. Pre-conditioning
activates flash management, which stabilizes data throughput over a period of time.
One way to pre-condition the PCIe SSD is to perform large block (64 KB or greater)
sequential writes to the entire device's capacity.
• Configure the server for low latency performance. To achieve maximum performance
with Dell PowerEdge Express Flash PCIe SSDs, change the server performance profile
in the BIOS settings to Maximum Performance.
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