OK, now that that is out of the way, lets get down to serious stuff ;-)
What if I want my / partition to be on a raid-0 set? How do I bootstrap it?
Build a kernel supporting raid-0, copy on floppy, boot off it, make a set of
hard disk partitions, and install on that?
----- Original Message -----
From: Raju Mathur <[EMAIL PROTECTED]>
To: Ajit Ranade <[EMAIL PROTECTED]>
Cc: <[EMAIL PROTECTED]>
Sent: Tuesday, May 02, 2000 1:37 PM
Subject: Re: [linux-delhi] raid
> >>>>> "Ajit" == Ajit Ranade <[EMAIL PROTECTED]> writes:
>
> >> For any RAID level above 1, hardware RAID is much faster.
>
> Ajit> does that mean i have to worry about drivers?
>
> Many are built-in in the kernel -- the Multi-Disk HOWTO tells you
> which ones, "make menuconfig" on a 2.3.99 kernel tells you even more
> :-)
>
> >> You need at least 3 disks to implement RAID-5, while 5 disks is
> >> recommended. You lose data storage capacity equivalent to one
> >> of the disks.
>
> Ajit> my impression was that you GET only disk storage = one
> Ajit> disk. you are saying that you get n-1/n disk storage. am
> Ajit> confused! in fact i thought 3 or 5 just increases
> Ajit> redundancy.
>
> I stand by what I said, i.e. you get storage equivalent to (n-1/n)
> disks. RAID-5 uses checksumming (error-correction) technology to make
> summaries of the data on all the disks and then stripes this summary
> over all the disks. With 5 disks, 20% of each disk is dedicated to
> this summary data.
>
> If you lose one disk, the summary can be used to regenerate the data
> on that disk.
>
> >> If you just want to span drives without building in redundancy,
> >> you can use the built-in Linux RAID-0 (striping).
>
> Ajit> no i need redundancy for at least /usr/local and /home. in
> Ajit> which case i could keep these file systems on 4.3 (three
> Ajit> mirrors) and have system on 9 gb.
>
> The ideal combinations are:
>
> 1. RAID-1 (mirroring) with software RAID
>
> 2. RAID-5 (summaries) with hardware RAID
>
> RAID-0 has 100% redundancy (i.e. for each 1GB you use you have to
> provide 2GB of disk space). RAID-5, as I mentioned above, has 20%
> redundancy (i.e. for each 4GB you use you have to provide 5GB).
> However, you need a RAID-5 card, so it's more expensive for small
> amounts of data.
>
> >> For explanations of various RAID levels, have a look at the
> >> Multi-Disk-HOWTO (part of the RH distribution) around line
> >> 2200.
>
> Ajit> thanks for the ref!
>
> Regards,
>
> -- Raju
>
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