iSCSI performance unacceptable

[Al-S]

Try this:

1. From the console, press CTRL+ALT+W,
2. Select Tuning options -> iSCSI daemon options -> Target options,
3. Select the target in question,
4. change the MaxRecvDataSegmentLength and MaxXmitDataSegmentLength values to the maximal required data size

(check w/ the initiators to match).

maxRecvDataSegmentLen=262144
MaxBurstLength=16776192
Maxxmitdatasegment=262144
FirstBurstLength=65536
DataDigest=None
maxoutstandingr2t=8
InitialR2T=No
ImmediateData=Yes
headerDigest=None
Wthreads=8

As an update, please keep in mind when using latest builds of DSS, MaxBurstLength variable cannot be set to 16776192 because such value was only supported in iSCSI Enterprise Target (IETD), additionally With reads variable also works only with (IETD).

Max value in SCST for MaxBurstLength is 1MB, 10485760.

In case when you use MaxBurstLength=16776192 and make the update, scripts during starting the system fix the values to default one (262144).

So you may leave MaxBurstLength variable values as the default value or you may use the max value which is 10485760.

[DIESOFTWARE-RS]

@Al-S

You got a bad Typo there:

Max value in SCST for MaxBurstLength is 1MB, 10485760
.
.
So you may leave MaxBurstLength variable values as the default value or you may use the max value which is 10485760.

should read:

Max value in SCST for MaxBurstLength is 1MB, 1048576
So you may leave MaxBurstLength variable values as the default value or you may use the max value which is 1048576.


Just one "0" to much...

Regards,
Ralph