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 -- Linux-User #280138 with the Linux Counter, http://counter.li.org/ ##################### Debian GNU/Linux Consultant ##################### Michelle Konzack Apt. 917 ICQ #328449886 50, rue de Soultz MSN LinuxMichi 0033/6/61925193 67100 Strasbourg/France IRC #Debian (irc.icq.com)
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