GitHub user akrasnov-drv closed a discussion: VM Disk performance issue
Hi,
We see degraded performance in our VMs in CloudStack (4.20.0.0) during
compilation and other heavy I/O operations.
I set our compute offerings to use local disk, nevertheless when there are
20-40 VMs per host, it does not work well.
As I understand it happens because of shared base disk architecture used by
CloudStack with QCOW images.
According to information I found for QCOW:
Case-Based Limits:
• Light workloads: 10-20 images sharing one base can work fine.
• Heavy workloads (e.g., database, high IOPS): Keep it below 5
per base.
• Cloud setups (OpenStack, CloudStack): Optimized storage
backends (Ceph, LVM) are preferable.
Please advise if
- there is a way to limit number of images per shared base (or completely
change this to independent disks)
- there is a way to define compute offering initially with 2 disks - 1st root
with shared base from template, 2nd independent and empty.
Thanks,
Alex.
GitHub link: https://github.com/apache/cloudstack/discussions/10468
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