02-28-2020, 03:37 PM
Hello!
I just wanted to share a quick video idea;
With DSM 7.0, SSD Cache BTRFS metadata pinning was added. I was wondering a few things:
- What is the performance impact (compared to it being disabled - aka "regular old cache"
- this might require testing of certain specific workloads*
- How does this scale as you add more storage? (i.e. I'm planning to upgrade to a bigger NAS next year with more storage, should I buy NVME SSDs now at ~1Tb (recommanded cache size for my 4x12Tb SHR1 RAID) or should I wait or get a larger 2Tb drive? Maybe with your contacts at synology you might be able to figure out what is the ration between cache size and volume size for BTRFS metadata pinning
I hope this is a good idea and can help,
Stefano
*I'm thinking about their support article: https://www.synology.com/en-global/knowledgebase/DSM/tutorial/Storage/Pin_all_Btrfs_metadata_to_SSD_cache
I just wanted to share a quick video idea;
With DSM 7.0, SSD Cache BTRFS metadata pinning was added. I was wondering a few things:
- What is the performance impact (compared to it being disabled - aka "regular old cache"
- this might require testing of certain specific workloads*- How does this scale as you add more storage? (i.e. I'm planning to upgrade to a bigger NAS next year with more storage, should I buy NVME SSDs now at ~1Tb (recommanded cache size for my 4x12Tb SHR1 RAID) or should I wait or get a larger 2Tb drive? Maybe with your contacts at synology you might be able to figure out what is the ration between cache size and volume size for BTRFS metadata pinning
I hope this is a good idea and can help,
Stefano
*I'm thinking about their support article: https://www.synology.com/en-global/knowledgebase/DSM/tutorial/Storage/Pin_all_Btrfs_metadata_to_SSD_cache