I could add that any system crashes from (linux software raid)raid-member
disk failure is likely a problem with the disk controller driver! All
hotswappable SATA devices should work without no adverse effects on the
system and allow hot swapping and rebuilds assuming the SATA controller
driver is good. Regular old IDE is a different story and will likely cause
a kernel panic if a drive fails to respond that the kernel had some
outstanding writes to do on as IDE drivers were not built with hot-swap in
mind!
A big benefit of software raid also is that it is disk and controller
agnostic. many people are still under the impression that raid requires
identical disks to function properly, but that is not the case with software
raid though the slowest member dictates the whole array's speed. If you
have a controller fail, you can pop one in a PCI* slot, possibly a hotswap
slot and hook up drives to it and you are back in business. You can even
plug the drives into USB adapters and bring the system back up or move the
disks to another system entirely, different distro, different hardware,
everything.
On Mon, May 5, 2008 at 6:19 PM, Carl Wilhelm Soderstrom <
[EMAIL PROTECTED]> wrote:
> On 05/06 09:00 , Adam Goryachev wrote:
> > Just to add my 0.02c worth to the discussion....
> > I don't like a lot of hardware raid because they don't provide a
> > consistent interface to the raid status. With software raid, every
> > machine regardless of linux (kernel) version, distro, or libraries, they
> > all have identical status information in /proc/mdstat.
>
> This is a very good point. The old Mylex RAID controllers were great in
> this
> regard; they had a tree under /proc which reported their status. I don't
> know if any other controller since then has done this. (Tho I believe
> Linus
> discourages the use of /proc for a lot of things now).
>
> --
> Carl Soderstrom
> Systems Administrator
> Real-Time Enterprises
> www.real-time.com
>
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