On Wed, Jan 7, 2015 at 10:43 AM, Valeri Galtsev <galtsev at kicp.uchicago.edu> wrote: >> >> Not junk - these are mostly IBM 3550/3650 boxes - pretty much top of >> the line in their day (before the M2/3/4 versions), They have >> Adaptec raid contollers, > > I never had Adaptec in _my_ list of good RAID hardware... But certainly I > can note be the one to offer judgement on hardware I avoid to the best of > my ability. If you can afford, I would do the test: replace Adaptec with > something else (in my list it would be either 3ware or LSI or areca), > leaving the rest of hardware as it is. And see it the problems continue. I > do realize that there is more to it than just pulling one card and > sticking another in its place (that's why I said if you can "afford" it > meaning in more general sense, not just monetary). It's not something happening as a repeatable thing or that I could consider better/worse after replacing something. Maybe 3 times a year across a few hundred machines and generally not repeating on the same ones. But if there is anything in common it is on very 'active' filesystems. -- Les Mikesell lesmikesell at gmail.com