Re: 4x lower IOPS: Linux MD vs indiv. devices - why?

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Am 23.01.2017 um 20:06 schrieb Kudryavtsev, Andrey O:
Hi Tobias,
Yes, “imsm” is in generic release, you don’t need to go to the latest or special build then if you want to stay compliant. It’s mainly a different layout of a raid metadata.

Your findings follow my expectations, for QD1 sync engine does good results. Can you try libio with QD4 and 2800/4 jobs?
Most of the time I’m running Centos7 either with 3.10 or latest kernel depends of the scope of the testing.

Changing sector to 4k is easy, this can really help. see DCT manual, it’s there.
This can be relevant for you https://itpeernetwork.intel.com/how-to-configure-oracle-redo-on-the-intel-pcie-ssd-dc-p3700/



It doesn't work =(


oberstet@svr-psql19:~/scm/parcit/RA/user/oberstet$ sudo isdct start -nvmeformat -intelssd 0 \
>   LBAFormat=4 \
>   SecureEraseSetting=0 \
>   ProtectionInformation=0 \
>   MetaDataSettings=0
WARNING! You have selected to format the drive!
Proceed with the format? (Y|N): y
Formatting...

- Intel SSD DC P3608 Series CVF8551400324P0DGN-1 -

Status : NVMe command reported a problem.

oberstet@svr-psql19:~/scm/parcit/RA/user/oberstet$ sudo isdct show -all -intelssd 0

- Intel SSD DC P3608 Series CVF8551400324P0DGN-1 -

AggregationThreshold : 0
AggregationTime : 0
ArbitrationBurst : 0
Bootloader : 8B1B0133
CoalescingDisable : 1
DevicePath : /dev/nvme0n1
DeviceStatus : Healthy
EndToEndDataProtCapabilities : 17
EnduranceAnalyzer : Media Workload Indicators have reset values. Run 60+ minute workload prior to running the endurance analyzer.
ErrorString :
Firmware : 8DV101F0
FirmwareUpdateAvailable : The selected Intel SSD contains current firmware as of this tool release.
HighPriorityWeightArbitration : 0
IOCompletionQueuesRequested : 30
IOSubmissionQueuesRequested : 30
Index : 0
Intel : True
IntelGen3SATA : False
IntelNVMe : True
InterruptVector : 0
LBAFormat : 0
LatencyTrackingEnabled : False
LowPriorityWeightArbitration : 0
MaximumLBA : 3907029167
MediumPriorityWeightArbitration : 0
MetadataSetting : 0
ModelNumber : INTEL SSDPECME040T4
NVMeControllerID : 0
NVMeMajorVersion : 1
NVMeMinorVersion : 0
NVMePowerState : 0
NVMeTertiaryVersion : 0
NamespaceId : 1
NativeMaxLBA : 3907029167
NumErrorLogPageEntries : 63
NumLBAFormats : 6
OEM : Generic
PCILinkGenSpeed : 3
PCILinkWidth : 4
PowerGovernorMode : 0 40W for 8 Lane Slot power
Product : Fultondale X8
ProductFamily : Intel SSD DC P3608 Series
ProductProtocol : NVME
ProtectionInformation : 0
ProtectionInformationLocation : 0
SMARTEnabled : True
SMARTHealthCriticalWarningsConfiguration : 0
SMBusAddress : 106
SectorSize : 512
SerialNumber : CVF8551400324P0DGN-1
TCGSupported : False
TempThreshold : 85
TimeLimitedErrorRecovery : 0
TrimSupported : True
VolatileWriteCacheEnabled : False
WriteAtomicityDisableNormal : 0

oberstet@svr-psql19:~/scm/parcit/RA/user/oberstet$ isdct --version
Syntax Error: Invalid command. Error at or around '--version'.
oberstet@svr-psql19:~/scm/parcit/RA/user/oberstet$ isdct version
- Version Information -
Name: Intel(R) Data Center Tool
Version: 3.0.2
Description: Interact and configure Intel SSDs.


oberstet@svr-psql19:~/scm/parcit/RA/user/oberstet$

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