On 09/12/2017 23:05, Reginald Beardsley via illumos-discuss wrote:
Does hardware RAID 6 make sense or is it better to have JBOD and RAIDZ2 instead?
What support will you have for observing and managing the hardware RAID
while the OS is running? In my experience, the vendor tools provided to
run on Solaris are miles behind the equivalent functionality provided by
Solaris itself for using ZFS RAID. So I don't see what the hardware RAID
gives you - it just gets in the way.
If hardware RAID 6 makes sense, does one run RAIDZ on top?
What HBAs are known to work? The HCL seems to only list cards which are quite
old and most are SAS rather than SATA.
No one builds JBODs with SATA drives, at least, not a second time.
SATA drives don't work well enough through SAS expanders - when a SATA
drive goes faulty, you won't be able to tell which one, because it will
cause the others to all drop off the expander too, and the OS will
report errors on them all, and then you probably have no redundancy.
SATA drives work fine on SAS controllers when connected 1-to-1, i.e.
without expanders, but JBODs don't normally work that way.
If you want to build a JBOD with cheap drives, use nearline SAS drives.
--
Andrew
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