On Sat, Mar 27, 2010 at 11:01:08AM -0700, Benjamin Franz wrote: > Pasi Kärkkäinen wrote: > > On Fri, Mar 26, 2010 at 11:14:18AM -0700, Benjamin Franz wrote: > > > >> Yup. 8 way RAID1 for the OS, 8 way RAID6 for the data. I was hoping when > >> I setup the 8-way RAID1 for the OS that I would get really good read > >> speeds since md is supposed to stripe reads from RAID1, but in practice > >> the RAID6 completely kills it for read performance (~61 MB/sec from the > >> RAID1 partition vs ~200 MB/sec from the RAID6 partition). > >> > >> In a deeply ironic turn of events, one of the hard drives in that > >> machine died in a way that freaked the hardware controller driver out > >> and caused a kernel panic last week. > >> > >> > > > > I've also seen CentOS 5.3 (or 5.4, not sure) crash when a single sata hdd failed. > > The system was running mdadm RAID-1 mirror, so it shouldn't have been fatal event.. > > > > There was kernel oops on the console. too bad I didn't have time to capture it then. > > System was running AHCI SATA on Intel ICH9 controller, with mdadm software raid. > > > > So there's still need for hardware RAID controllers.. > > > > I'm not sure that is a good conclusion. The controller *is* a (3ware) > hardware RAID controller - but the drive failure caused the 3ware driver > to crash. That I wasn't using the controller in HW RAID mode may not be > a good indicator that all would have been well if I had been. > Heh.. well.. it seems we have many bugs.. :) -- Pasi