Skylar Thompson wrote: > 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. >
Thanks a lot! There's just one thing left: to make it work in real life.... :)) Best regards, Tomislav _______________________________________________ Beowulf mailing list, Beowulf@beowulf.org sponsored by Penguin Computing To change your subscription (digest mode or unsubscribe) visit http://www.beowulf.org/mailman/listinfo/beowulf
