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FYI, RAID info on SB750 certainly isn't stored on the disks

mikeymikec

mikeymikec

Lifer
In the situation I encountered, this didn't particularly matter, but the RAID configuration was lost after a CMOS reset. On reboot (and after changing the SATA operation to RAID and rebooting again), the RAID system just saw two drives without realising they used to be in RAID1 configuration.

I just thought I'd mention this in case anyone is relying on AMD RAID. I don't have a setup with which I can test newer versions of the AMD southbridge.

The board in question is an ASUS M4A78T-E.

Who would trust RAID0 in this scenario? 😛
 
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This is why I would never trust RAID0 without a separate HDD backup. You have to rebuild the array. Then what the prudent RAID0 user would do is clone/copy his/her backup to the new array.

Unless you have a separate backup drive, loss of a RAID0 drive usually results in a totsl loss of the data that was on the array.
 
I personally wouldn't trust RAID0 full stop, this situation just adds to the list of reasons why not 🙂

Something I really must look into at some point is the practicality of rebuilding a desktop RAID1 array in such a situation.
 
Trust RAID 0 for what though ?
RAID 0 is perfectly fine if you know what it should be used for.

If you want fast read speeds, then RAID 0 is a valid option to try. It may not be the 'safest', but RAID 0 isn't made for being safe.
 
Anything that is used to store data for a required length of time has to be trusted to reliably suit that purpose, hence 'trust'.

I suppose it could be used in some sort of 'scratch disk' processing scenario - the system retrieves data from some other source, copies it to the RAID0 scatch volume, processes it in whichever it needs to be processed (taking advantage of the advantages of RAID0's performance), then it is transferred from the volume to somewhere more reliable for longer-term storage. Such an example is so far removed from anything I might use a computer for (or have seen a computer used), hence, "I personally wouldn't trust RAID0".

In other news, I would like to slap ASUS for incorrectly labelling the SATA ports on the M4A78T-E. They have the ports labelled as (birds eye view of the board, portrait style, CPU nearest top edge) in both the manual and on the board as:

SATA1 SATA2 SATA5
SATA3 SATA4

When it actually is:

SATA1 SATA3 SATA5
SATA2 SATA4

(confirmed with the RAID BIOS and the web-based AMD RAID array)
 
You shouldn't trust Raid 0 with data that you don't have backups for. It's great for caching and anything that requires high transfer rate. But you should never use it to store important data.
 
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