On 09/10/2012 09:05 AM, Stan Hoeppner wrote:
On 9/10/2012 5:47 AM, Veljko wrote:
There is something that is not clear to me. You recommended hardware RAID
as superior solution. I already knew that it is the case, but I thought
that linux software RAID is also some solution.
You mean "same" solution, yet? They are not equal. Far from it.
What would be drawbacks of using it? In case of one drive failure, it is
possible that it won't boot or it just won't boot?
This depends entirely on the system BIOS, its limitations, and how you have
device boot order configured. For it to work seamlessly you must manually
configure it that way. And you must make sure any/every time you run lilo or
grub that it targets both drives in the mirror pair, assuming you've
installed lilo/grub in the MBR.
Using a hardware RAID controller avoids all the nonsense above. You simply
tell the system BIOS to boot from "SCSI" or "external device", whatever the
manual calls it.
But from what I'm told, hardware RAID has the downside that it often relies on
the exact model of RAID card; if the card dies, you'll need an exact duplicate
in order to be able to mount the RAID. It also (at least in the integrated cases
I've seen) works only with the ports provided by the card, not with any/all
ports the system may have.
Hardware RAID is simpler to configure, is easier to maintain, and is faster (or,
at least, places less load on the CPU). My own experience seems to indicate
that, all else being equal, software RAID is less hardware-dependent and more
expandable.
There are advantages and disadvantages to both options, including probably some
I haven't listed. I personally prefer software RAID for almost all cases, simply
due to my own personal evaulation of how much aggravation each of those
advantages and disadvantages provides or avoids, but hardware RAID is certainly
a legitimate choice for those who evaluate them differently.
--
The Wanderer
Warning: Simply because I argue an issue does not mean I agree with any
side of it.
Every time you let somebody set a limit they start moving it.
- LiveJournal user antonia_tiger
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