Am 2007-08-29 14:54:31, schrieb Mike Bird:
> Software RAID has been reliable for many years. We use software RAID in
> Etch on dozens of systems ranging from small workstations to terrabyte
> arrays. When two drives fail in a RAID 5 you'll lose your data - under
> software RAID yes but also under hardware RAID. There's no need for
> a 'rebuild drive' because the rebuild starts when the new drive is added
> with a command such as "mdadm -a /dev/md0 /dev/sda". Simple and fast.
But you have to shutdown the System to change the drive, since you can
not change HDD's on the fly using Software-Raid. Another thing which
does not work with Software-Raid is hotfix...
One point for me and my Hardware-Raid!
> Hardware RAID can only manage entire drives. For flexibility and
> efficiency software RAID manages partitions. As you gain experience
> with RAID, you'll want different filesystems with different RAID
> characteristics within a single system. As a complex but real-world
> example: one can have four drives with /boot 4-way mirrored, swap
> consisting of two 2-way mirrors, most of the filesystems in RAID-5,
> and a large cache (e.g. squid or netflow) in RAID-0 or LVM PVs.
> Hardware RAID is much more expensive, and you have to keep a spare
> controller (or motherboard) to recover your data when the original
> controller (or motherboard) dies.
How does MD handel multiboot between Linux, BSD, Solaris and Windows?
Second point for me and my Hardware-Raid!
> There are many people who know how to manage software RAID systems
> without unnecessarily losing data. Such people will most likely
> have actually used software RAID such as MD with persistent
> superblocks and will know that there is nothing to the above FUD
> unless they deliberately sabotage the default configurations. It
> sounds like you're trying to hand assemble RAIDs from lists of
> drive partitions rather than using UUIDs. LILO automatically updates
> mirrors. With the current Grub one should grub-install each mirror.
Bad, since Lilo is working on ALL of my x86/amd64 Computers but Grub
fails on some to boot...
(This is the reason, why I can not use Xen on my Devel-Machine which
is a Dual-Opteron with 24 GByte of Memory...)
Thanks, Greetings and nice Day
Michelle Konzack
Systemadministrator
Tamay Dogan Network
Debian GNU/Linux Consultant
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