[linux-lvm] Looking ahead - tiering with LVM?

[Roy Sigurd Karlsbakk]

>> First, filelevel is usually useless. Say you have 50 VMs with Windows
>> server something. A lot of them are bound to have a ton of equal
>> If you look at IOPS instead of just sequencial speed, you'll see the
>> difference. A set of 10 drives in a RAID-6 will perhaps, maybe, give
>> you 1kIOPS, while a single SSD might give you 50kIOPS or even more.
>> This makes a huge impact.
> 
> IOPs are already well server by LVM cache. So, I genuinely ask: what
> would be tiering advantage here? I'll love to ear a reasonable use case.

LVMcache only helps if the cache is there in the first place and IIRC it's cleared after a reboot. It help won't that much over time with large storage. It also wastes space.

Vennlig hilsen

roy
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Roy Sigurd Karlsbakk
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