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We're running a huge SAP HANA workload in a VM deployed in a public cloud. The VM has 3.8 TB of memory and 128 cpus.

We have been hit with very slow disk throughput in the data disks - this is where the database persistence resides. Now Hana being an in-memory database, frequently persists data from the memory to the data disks to insure against data loss. One of the measures suggested was to increase the size of the root disk to 1 TB in order to achieve a higher IOPS. I would like to seek your opinion if this indeed could improve the overall performance of the VM. Or, does anyone here have a similar experience. The OS is SUSE linux 12 SP3. The kernel version is 4.4.162

Rui F Ribeiro
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AjRev
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  • You might want to specify exactly which public cloud provider you're using and which storage options you've chosen for your cloud VM. Does the cloud provider offer different storage tiers? Is there a storage option available that provides more performance than the one you're currently using? – telcoM Mar 30 '19 at 14:40
  • This is running on MS Azure. There are multiple options in terms of IOPS that we can choose the disks from. On a general note, does Linux need a high performing root disk for the OS? Sorry for the delay as I was travelling. Thanks for your time. – AjRev Apr 04 '19 at 04:36

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