[lustre-discuss] separate SSD only filesystem including HDD

Alexander I Kulyavtsev aik at fnal.gov
Fri Aug 31 08:31:14 PDT 2018

Thanks, Andreas!
I’m looking on similar configuration.

Performance wise, is zfs or ldiskfs recommended on NVMe OSTs?
We are comfortable with zfs on current HDD system, how much penalty we will pay for ldiskfs on NVMe?
zfs overhead can be different for high IOPS with NVMe; are there numbers?


On 8/31/18, 3:20 AM, "lustre-discuss on behalf of Andreas Dilger" <lustre-discuss-bounces at lists.lustre.org on behalf of adilger at whamcloud.com> wrote:

    Just to confirm, there is only a single NVMe device in each server node, or there is a single server with 24 NVMe devices in it?
    Depending on what you want to use the NVMe storage for (e.g. very fast short-term scratch == burst buffer) it may be OK to just make a Lustre filesystem with each NVMe device a separate OST with no redundancy.  The failure rate for these devices is low, and adding redundancy will hurt performance.
    Cheers, Andreas

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