On Sunday 03 September 2006 14:11, you wrote: > On Sun, 3 Sep 2006, Clive Messer wrote: > > This leads me to a question. I understand from reading the linux-raid > > archives that the current behaviour when rebuilding with a single > > badblock on another disk is for that disk to also be kicked from the > > array. For some time I have considered buying a 3ware 9500 card and > > using that instead of my current ICH6 and md solution. Can anyone tell > > me what would happen in the same scenario with a 3ware card. ie. would > > that transparently handle a RAID-5 disk failure and rebuild, with a > > badblock on another disk? Or would I have even less chance of getting my > > data back? > > I only have experience with the 7500 series card and it does the > following if you run it in 3ware RAID5 mode: > > If there is a read error (bad block) on a disk and the array is not > degraded, it will recalculate the content of the block from the other > disks and write the bad block, causing the drive to re-allocate. It > will log that it did this. > > If the array is degraded as per your description, it will default to the > same behaviour linux kernel does for sw-raid, ie stop rebuilding if it > encounters a read error. > If on the other hand you do want it to ignore the read error, you can tell > it to do so. Mikael, Thankyou for the information. Does anyone have a preference for cards other than 3ware if purchasing a 'hardware' raid card? From what have read the 3ware cards are very well regarded and the driver is open source. Also, while I'm here, I need to purchase 6 low/mid end, non-rackmount servers for work. Can run any version of Linux on them and will probably choose a 'free' version. I have been looking at the Dell Poweredge 1800's with sata drives. Can anyone tell me if the supplied 'CERC 6 SATA RAID CONTROLLER 6 CHANNELS' is well supported on Linux and if it is hardware or software raid? Has anyone been running these with the md driver - any issues? Regards Clive -- Clive Messer <clive@xxxxxxxxxxxxxxxxx> -- VGER BF report: U 0.493795 - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
