Comments on How To Set Up Software RAID1 On A Running System (Incl. GRUB Configuration) (Debian Lenny)

How To Set Up Software RAID1 On A Running System (Incl. GRUB Configuration) (Debian Lenny) This guide explains how to set up software RAID1 on an already running Debian Lenny system. The GRUB bootloader will be configured in such a way that the system will still be able to boot if one of the hard drives fails (no matter which one).

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By: Anonymous

in your configuration, you have 3 seperate raid devices that share the same head on the hard disk(s).  You would get better performance if you instead made a single raid device (md0) and partitioned that device with 3 partitions.  The reason for this is simple.  The IO scheduler would be aware that this is a single disk (or read/write queue) and schedule accordingly where having 3 different raid arrays all sharing a single disk head and the kernel will think that they operate independantly and not schedule in an optimal way.

This certainly wouldnt matter for the /boot partition because it is likely only read while the other arrays are not but the swap and root raids will be read and written too at the same time.