NTFS cluster size

[imrevo]

Good morning,

what NTFS cluster size should be chosen for iSCSI targets? 4K would be default, but I think I've read something about 64K being better for iSCSI targets.

bye
Volker

[jeddyatcc]

64k is the suggested size, but I would really recommend testing performance. While Starwind writes in 64k blocks, I have gotten better performance using 4k or 32k block sizes on different arrays.

[Anatoly (staff)]

Totally agree with jeddyatcc - this should be the test based choice.

[imrevo]

Hi Anatoly,

Totally agree with jeddyatcc - this should be the test based choice.

Will be done as soon as the new drive arrives I'll keep you posted.

Already did some testing with the NTFS cluster size within a VM: No performance difference worth mentioning between 4K and 64K, base disk of the HA-Image was on a disk formatted with 4K NTFS cluster size.

bye
Volker

[Anatoly (staff)]

Any update here please?

[imrevo]

Good morning Anatoly,

Any update here please?

I stayed with 4K as the difference between 4K, 32K and 64K has been neglectable during my tests.

bye
Volker

[Anatoly (staff)]

Thanks for the heads up!