[lustre-discuss] What does your (next) MDT look like?

Brian Andrus toomuchit at gmail.com
Tue Feb 6 11:07:48 PST 2018


For OSTs, I like to use ZFS as the backing filesystem and then use an 
SSD/NVME as the cache disk(s) for a zpool.

The MDT, depends on the expected data. If it is all large, I do a 
minimal size using SSD/NVME. If there will be a significant number of 
smaller files, I plan for multiple MDTs with larger sizes (still using 
zfs as the backing filesystem).

Those are just general starting points that seem to work well for the 
installations I have done where I have a little more freedom in the 


Brian Andrus

On 2/6/2018 9:32 AM, E.S. Rosenberg wrote:
> Hello fellow Lustre users :)
> Since I didn't want to take the "size of MDT, inode count, inode size" 
> thread too far off-topic I'm starting a new thread.
> I'm curious how many people are using SSD MDTs?
> Also how practical is such a thing in a 2.11.x Data On MDT scenario?
> Is using some type of mix between HDD and SSD storage for MDTs practical?
> Does SSD vs HDD have an effect as far as ldiskfs vs zfs?
> Thanks!
> Eli
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