So I have boot on the SSD and swap on the HDD then the rest of the SSD is lcmcache pool. And the spinner is my main drive as a single partition. So far this has worked nicely but there are time when you do some big writes you feel the fact there is a spinner under the hood. I could likely resolve this by playing with write cache settings. But the way I am using this its not usually an issue. 

Definitely see a big change on commonly used files vs infrequently used files. 

On Dec 3, 2016 1:13 PM, "Michael Butash" <mike@butash.net> wrote:

Are you using it as a single partition install, and/or any raid with btrfs? 

My idea is to replace mdadm, the fact I have to make /boot first, and all the other complexities of the layers that come with.  I'm not fond of the notion of file-based encryption with encfs, I prefer the whole disk as with SSD, I see no performance degradation as with a spinner+encryption.

Much like yourself, I was intending to play with lvmcache with this build around my bigger spinners (damn game installs are huge these days to keep on ssd), but otherwise really would love to just do away with all of that and use zfs/btrfs in one suite for the disk management for all that can do the caching internally too.

ZFS is attractive for zpool functionality, but much of it is in theory same as what btrfs offers so I don't have much of a pref.  I'll be using these on some nvme drives, so I doubt I'd need another fast(er) disk to cache zilog too, but would be nice for some 2tb disks I'm putting in for games and such would be nice.

-mb


On 12/03/2016 12:33 PM, Stephen Partington wrote:
So far btrfs has been treating my server very nicely 

On Dec 3, 2016 12:22 PM, "Michael Butash" <mike@butash.net> wrote:
Anyone using "alternative" file system methods like btrfs or zfs to boot with?  Nothing seems too native, but can be made to work it seems, just wondering if this is one of those "should do" vs. "can do".

The notion of something that can do raid, encryption, volume management, and snapshot features is attractive, but I've always layered mdraid, luks encryption, lvm, then ext atop that.  This has been pretty solid when the ssd's don't die 3-6 months later, even with aligning partition to block boundaries and such, trim, etc.  I'd love to have one single encrypted partitions I can use volumes within for the os mounts, btrfs and zfs in theory do most of this now.

How well is really the question...

Commentary appreciated!

-mb

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