I have the opportunity for a greenfield Lustre 2.5+ site.
We only have on-site experience with 2.1.x and hw RAID ldiskfs.
A major decision point is OSS HBA dumb or RAID, and ldiskfs or ZFS; so could you chime in on, if you had the choice for 2.5+ would you go for:
1. RAID HBAs or dumb HBAs+RAID enclosure using hw RAID ldiskfs. Would you even consider hw RAID ZFS?
E.g., some sample hardware (as we are mostly a Dell shop)
Dell PERC+MD1200/C8000XD encl,
Dell 6Gbps SAS (dumb) HBA + MD3200 encl
2. Dumb HBAs with ZFS raidz2
E.g. Dell 6Gbps SAS (dumb) HBA + MD1200 or C8000XD
Thanks for you wisdom.