Chache writeback vs writeback (unsafe)
- Thread starter Maksimus
- Start date
Unsafe can be faster because it lies about sync write commands being safely written (which they are not, yet) to disk. It really depends on your specific use case. Test for yourself to make sure the risk is worth it to you.
EDIT: If you have enterprise NVMe drives, then they probably already cache sync writes, which is safe because of the battery backup (PLP) and you'll see no performance increase.
EDIT: If you have enterprise NVMe drives, then they probably already cache sync writes, which is safe because of the battery backup (PLP) and you'll see no performance increase.
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Keep in mind that all caching modes besides none will use RAM to buffer data, which can increase your actual ram usage by a significant margin.
Jup, you cache twice or even three times in RAM:
1.) Inside VM
2.) on the virtualization layer
3.) ZFS ARC
Thats why it is usually recommended (and default) to use "none" as cache mode when using ZFS.
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