Hi all, Wondering if anyone can share experience with architecting Nova KVM boxes for large capacity high-performance storage? We have some particular use-cases that want both high-IOPs and large capacity local storage.
In the past we have used bcache with an SSD based RAID0 write-through caching for a hardware (PERC) backed RAID volume. This seemed to work ok, but we never really gave it a hard time. I guess if we followed a similar pattern today we would use lvmcache (or are people still using bcache with confidence?) with a few TB of NVMe and a NL-SAS array with write cache. Is the collective wisdom to use LVM based instances for these use-cases? Putting a host filesystem with qcow2 based disk images on it can't help performance-wise... Though we have not used LVM based instance storage before, are there any significant gotchas? And furthermore, is it possible to use set IO QoS limits on these? -- Cheers, ~Blairo
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