/dev/md0 is not mounted and it doesn't have a filesystem because you didn't format the device after creating it. After you have created the filesystem, run: mkfs.ntfs --fast /dev/md0 After that, you can mount it: mount /dev/md0 /mnt/windows On Fri, Sep 18, 2009 at 12:39 AM, Linux Raid Study <linuxraid.study@xxxxxxxxx> wrote: > Hi Robin: > > I use mdadm cmd to create Raid5 device and did following: > > #mdadm --create /dev/md0 --level=5 --assume-clean --raid-devices=4 > /dev/sda /dev/sdb /dev/sdc /dev/sdd > > #mdadm -w /dev/md0 > mdadm: failed to set writable for /dev/md0: Device or resource busy > > ~ # mount > none on /proc type proc (rw) > none on /dev/shm type tmpfs (rw) > none on /dev/pts type devpts (rw,mode=600) > none on /sys type sysfs (rw) > none on /mnth type hugetlbfs (rw) > > As u would notice, /dev/md0 is yet mounted...not sure why the above error.... > > Thanks for ur help! > > On Thu, Sep 17, 2009 at 1:02 PM, Robin Hill <robin@xxxxxxxxxxxxxxx> wrote: >> On Thu Sep 17, 2009 at 12:23:22PM -0700, Linux Raid Study wrote: >> >>> Hello: >>> >>> I have to bundle 4 disks as a Raid5 device, export it to iSCSI >>> initiators and format it as NTFS. >>> >>> What is better: >>> - Format individual disks as NTFS and then bundle them as Raid5 device >>> and export to initiator PCs >>> - Or bundle the disks first as Raid5 dev, export them and then format >>> the /dev/md0 device as NTFS >>> >>> I get "write-protected" errors when I do the second option. Does it >>> mean formatting of raid5 device is not allowed? >>> Does Raid5 inherit the NTFS properties of individual disks (first option)? >>> >> I don't see your first option working at all. When you bundle the >> drives together, the resulting device will have totally scrambled the >> underlying NTFS filesystems. >> >> The second option is how md RAID is supposed to work - you bundle >> together the disks into a single array, then format that. Where are you >> getting the "write-protected" errors? Are you trying to format the >> exported iSCSI device from a remote system? Certainly the RAID device >> can be formatted directly, but I've no idea how the iSCSI affects >> things. >> >> HTH, >> Robin >> -- >> ___ >> ( ' } | Robin Hill <robin@xxxxxxxxxxxxxxx> | >> / / ) | Little Jim says .... | >> // !! | "He fallen in de water !!" | >> > -- > 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 > -- Majed B. -- 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
