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List:       ataraid-list
Subject:    Re: Linux RAID Monitoring Program
From:       Craig Knox <crg () monster ! gotadsl ! co ! uk>
Date:       2002-01-18 3:33:08
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Jim,

> Your comment that the ATARAID module is "NOT"  fault tolerant is very
> unsettling.
> My primary reason for using RAID mirroring is to protect the data on the disks.

Then don't use the promise controller with Linux.  IMHO don't use the
Promise raid controller at all.  Use a "real" raid controller.

> replaced.    You are correct, the Linux Software RAID is very fault tolerant.
> The Linux Software RAID's fault tolerant capability works great.

That is correct.
 
> Are you certain that ATARAID is "NOT fault tolerant"  ??

Have a look at /usr/src/linux/drivers/ide/ataraid.c or in particular
/usr/src/linux/drivers/ide/rdcraid.c.  You don't even need to be a
programmer, for example the comments in pdcraid1_read_request (line 335)
mention "Later on, online/offline checking and performance needs
adding". 
If you are reading and not checking whether a disk is online/offline how
much fault tolerance do you have?
It is only version 0.3beta? after all.

> Being fault tolerant is very important.     Are you sure that ATARAID is NOT
> fault tolerant ??  ( Arjan, Does the ataraid module support a fault tolerant
> RAID-1 array ?? )

If you want software raid use a normal promise card and use Linux's
software RAID, it you want a hardware solution and linux - don't use
Fasttrack as its only a BIOS solution and a driver (software)
implemented RAID.

Craig.






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