On 8/19/16 1:02 AM, Bob Friesenhahn wrote: > I am looking at a 16-bay SuperMicro chassis. There is the option of > using a SAS HBA with 16 channels (e.g. Avago SAS 9300-16i) and no > expander or a SAS HBA with 4 channels and an expander. Most drives > would be SAS but I might want to fit a couple of SATA SSDs. > > Is there a strong technical reason (performance, reliability, uptime) to > prefer one or the other with OmniOS and zfs? > > The main technical issue I am already aware of is that one should not > put SATA devices behind an expander. > > I am leaning toward the 16 channels and no expander solution since it > feels better from a failure-mode standpoint, because it lessens > contention, and because it should allow use of SATA SSDs. > > Bob
Direct. SATA SSDs and SAS drives on the same expander is asking for trouble. I've got experiences with locked up expanders, requiring a hard power cycle of the enclosure. Avoid like the plague. -- Saso _______________________________________________ OmniOS-discuss mailing list OmniOS-discuss@lists.omniti.com http://lists.omniti.com/mailman/listinfo/omnios-discuss
