On 5/21/07, Phillip Susi <psusi@xxxxxxxxxx> wrote:
It could happen that the bios sees both disks just fine, but for whatever reason, the kernel only sees one. In that case, dmraid will activate the set with just the one disk, but without updating the metadata to indicate this has been done, the set will be corrupted at the next boot. Not good...
Already happened here, I think... I have my two disks mirrored on an "Intel Corporation 82801GR/GH (ICH7 Family) Serial ATA Storage Controller AHCI". From the grub prompt I can browse (hd0,2) and (hd1,2) and I can see there's a difference between them. The BIOS tool says everything is fine (and there's no option to repair). The damage was probably caused either by playing with udev rules or by having savedefault in the grub menu.lst. $ sudo dmraid -s *** Group superset isw_dhedigiiib --> Active Subset name : isw_dhedigiiib_osmoraid size : 488390656 stride : 256 type : mirror status : ok subsets: 0 devs : 2 spares : 0 $ sudo dmraid -r /dev/sda: isw, "isw_dhedigiiib", GROUP, ok, 488397166 sectors, data@ 0 /dev/sdb: isw, "isw_dhedigiiib", GROUP, ok, 488397166 sectors, data@ 0 $ sudo dmraid -b /dev/sda: 488397168 total, "S09QJ10YB19706" /dev/sdb: 488397168 total, "S09QJ10YB19699" $ sudo dmraid -tay isw_dhedigiiib_osmoraid: 0 488390656 mirror core 2 131072 nosync 2 /dev/sda 0 /dev/sdb 0 ERROR: opening "/dev/.static/dev/mapper/isw_dhedigiiib_osmoraid" What does "nosync" mean? I get the same on another machine where I thought everything was fine though. However, I wonder if I screwed up when I chose AHCI in the BIOS before installing - I thought it meant ahci+raid - the OS'es think I am running RAID, but I am not sure about the BIOS. (XP sees only the raid volume so it seems to work fine, but the Intel Management Console does not say anything about RAID, just lists the two disks. And grub sees two disks.) Tormod _______________________________________________ Ataraid-list mailing list Ataraid-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/ataraid-list
