If I have four SATA 6 Gbps SSDs, what's faster?

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alpha754293
Posts: 64
Joined: 2019/07/29 16:15:14

If I have four SATA 6 Gbps SSDs, what's faster?

Post by alpha754293 » 2019/08/20 03:23:59

If I have four SATA 6 Gbps SSDs, what's faster:

Option 1: Put all four SSDs into a stripped zpool using ZFS on Linux/CentOS, on a head node, and exporting that ZFS pool over NFS over RDMA?

Option 2: Put all four SSDs into a stripped RAID array using XFS, on a head node, and exporting that RAID array over NFS over RDMA?

Option 3: Put one SSD into each of my compute nodes (four nodes in total), and format that as either ZFS or XFS (or ext4), and then use GlusterFS over RDMA?

I am looking for maximum usable capacity and speed.

Thank you.

aks
Posts: 2829
Joined: 2014/09/20 11:22:14

Re: If I have four SATA 6 Gbps SSDs, what's faster?

Post by aks » 2019/08/20 19:07:58

Well measure your particular use cases!
I/O patterns are quite different for say a few large files versus lots of small files.
Anyway NFS is probably the problem ("NFS is ALWAYS the proble,m" - TM - you heard it here first :lol: )

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