Tomislav Maric wrote: > First of all: thank you very much for the advice, Skylar. :) > > So, all I need to do is to create the same partitions on three disks and > set up a RAID 5 on /home since I'll be doing CFD simulations (long > sequential writes) and use RAID 1 for other (system) partitions, to > account for recovery of the system in case of disk failure because log > writes are sequential and small in volume. I was reading about RAID 0, > but I'm not sure how safe is to use it for storing computed data and how > much speed would I get compared to RAID 5. >
Cool. If you have zippy processors the overhead of calculating parity probably isn't going to be too high, so RAID 5 and RAID 0 will be comparable. Sequential reads and writes are ideal for RAID 5. > Sorry for the totally newbish questions. > > I'm using Ubuntu, and after I install it, I'll try to configure the RAID > manually. How do I make sure that the boot loader is on all disks? I > mean, isn't RAID going to make the OS look at the /boot partition that's > spread over 3 HDDs as a single mount point? > > You'd mount /boot using the /dev/md? device, but point your boot loader at one of the underlying /dev/sd? or /dev/hd? devices. This means updates get mirrored, but the boot loader itself only looks at one of the mirrors. -- -- Skylar Thompson (sky...@cs.earlham.edu) -- http://www.cs.earlham.edu/~skylar/
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