software raid

[C M Reinehr]

Vu,

On Thu 07 August 2008 13:53, vu pham wrote:
> > This is from the mdadm manual, describing modes of operation:
> >
> > Follow or Monitor
> > 	Monitor one or more md devices and act on any state changes. This is
> > only meaningful for raid1, 4, 5, 6, 10 or multipath arrays as only these
> > have interesting state. raid0 or linear never have missing, spare, or
> > failed drives, so there is nothing to monitor.
> >
> > First, do you have the mdadm monitor daemon enabled and running?
> >
> > Second, from the sound of it, monitoring may not work on raid 0 arrays,
> > even if you have it enabled. Someone with more knowledge of mdadm will
> > have to answer this.
>
> I think it is the raid 0 that is not monitored. After changing to raid
> 5,  mdadm does show the problem.
>
> This is my test system. Just want to see how software RAID works. Never
> use it before. Cool but I still prefer the hardware RAID :)
>
>
> Thanks,
>
> Vu

Glad you could figure it out.

I'm just the opposite, I prefer the software (md) raid and use nothing but 
Raid 1. Considering how inexpensive hard drive capacity is these days, I 
don't mind the extra expense of raid 1 over raid 5. I overlay the raid drives 
with LVM and get stripping, as well. I like the fact that if a drive fails I 
still can recover the data off of the remaining drive.

cmr

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