Hi All,
I am facing IOPS issue with servers using SAS2 expanders vs directly connecting the disks to HBA
Let me first explain the issue
I have 2 servers supermicro 36 disks
1 of them does not have backplane and the other have 2x backplane(one in front and one on the back)
in both of them I have 8TB HGST SAS3 disks identical , same with ram and cpu
in the one with no backplane I am connecting the disks to 4x SAS3008 HBA
in the other one I have 2x sas2308 HBA (one connected to 24 disks and the other to 12)
the IOPS on the one with 4x SAS3008 is significantly higher than the with backplanes and 2x sas2308 HBA
I am not concerned about throughput but IOPS is the main factor and I dont understand why the one with SAS2 expander and SAS2 hba is performing this bad since we are not even trying to push 1GB/s of throughout total
changing the backplane (expander) is expensive and hard but I can connect the expander to 2x SAS3008 HBA
My question is the limited IOPS is caused by the expander or the newer HBA are much better at handling IOPS ? and based on the answer will just changing the HBA to SAS3008 HBA and keeping the same SAS2 expander will give any benefits ?
Thanks
I am facing IOPS issue with servers using SAS2 expanders vs directly connecting the disks to HBA
Let me first explain the issue
I have 2 servers supermicro 36 disks
1 of them does not have backplane and the other have 2x backplane(one in front and one on the back)
in both of them I have 8TB HGST SAS3 disks identical , same with ram and cpu
in the one with no backplane I am connecting the disks to 4x SAS3008 HBA
in the other one I have 2x sas2308 HBA (one connected to 24 disks and the other to 12)
the IOPS on the one with 4x SAS3008 is significantly higher than the with backplanes and 2x sas2308 HBA
I am not concerned about throughput but IOPS is the main factor and I dont understand why the one with SAS2 expander and SAS2 hba is performing this bad since we are not even trying to push 1GB/s of throughout total
changing the backplane (expander) is expensive and hard but I can connect the expander to 2x SAS3008 HBA
My question is the limited IOPS is caused by the expander or the newer HBA are much better at handling IOPS ? and based on the answer will just changing the HBA to SAS3008 HBA and keeping the same SAS2 expander will give any benefits ?
Thanks