----- Original Message ----- > On 08/06/15 20:28, Pierre Wieser wrote: > > Hi all, > > > > I currently have an almost full RAID 5 built with 4 x 2 TB disks. > > I wonder if it would be possible to migrate it to a bigger RAID 5 > > with 3 x 6TB new disks. > > > Do you have a spare (I presume SATA) disk port? I am away from home this evening, but, no, I do not "see" any free sata port. > > I've imagined something like that : > > - successively fail, remove a 2TB disk, add a 4TB disk, wait for end of > > recovery on three 2TB disks > > If you've got a spare port, the newer mdadm's have, I believe, a "clone > and replace" option. Much better than failing then rebuilding. I was not conscious of this option. I understand that it is better because this prevents me to pass through a "clean, degraded" state ? As I expect that the clone time will be identical the a recovery one ? > If not, is it worth getting a SATA expansion board? If you've not got a > specialist mobo, surely a board is only going to cost a tenner or so, > and quality isn't *that* important seeing as it's only a temporary measure. Yes, you're right: it might be worth to purchase another sata controller, as I have PCI-e free ports, enough alimentation. Maybe a small issue at disk enclosure level. To be checked... > > - at the end of this first phase, I have the same ~6TB RAID 5 clean group > > with 3 x 4TB + 1 x 2TB disks > > - declare the last 2 TB disk faulty and remove it > > - the RAID 5 group state goes to clean, degraded > > - grow the RAID 5 group with --size=max option > > - grow the RAID 5 group with --array-size=~12TB option > > - last, grow the RAID 5 group with --raid-devices=3 and --backup-file=... > > options. > > > > And I have tested it on a small test RAID 5 group. > > As expected, this last command makes the RAID 5 group begins a reshaping > > operation. > > But this one keeps stucked at zero. > > > > So I have several questions : > > > Don't think I've answered any of them, but I might have raised new ones. > I just hope the tip saves you a bit of time. Surely you have opened new pistes. Thanks. > Cheers, > Wol > > -- 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
