After a crash I had to replace one of my HDDs (namely sdd). The old one (and the one left - sdc - and the md0 itself) use a blocksize of 512 Bytes. The new drive has a physical blocksize of 4K.
The question now is, can I add the new drive to the RAID and will it work out?
Here some info from fdisk: (where md0 is the raid, sdc is active, and sdd is the new one that will be used for replacement):
# fdisk -l /dev/md0 /dev/sdc /dev/sdd Platte /dev/md0: 1000.2 GByte, 1000202174464 Byte 2 Köpfe, 4 Sektoren/Spur, 244189984 Zylinder Einheiten = Zylinder von 8 × 512 = 4096 Bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x00000000 Festplatte /dev/md0 enthält keine gültige Partitionstabelle Platte /dev/sdc: 1000.2 GByte, 1000204886016 Byte 255 Köpfe, 63 Sektoren/Spur, 121601 Zylinder Einheiten = Zylinder von 16065 × 512 = 8225280 Bytes Sector size (logical/physical): 512 bytes / 512 bytes I/O size (minimum/optimal): 512 bytes / 512 bytes Disk identifier: 0x31eb0cf1 Gerät boot. Anfang Ende Blöcke Id System /dev/sdc1 1 121601 976760001 fd Linux raid autodetect Platte /dev/sdd: 1000.2 GByte, 1000204886016 Byte 255 Köpfe, 63 Sektoren/Spur, 121601 Zylinder Einheiten = Zylinder von 16065 × 512 = 8225280 Bytes Sector size (logical/physical): 512 bytes / 4096 bytes I/O size (minimum/optimal): 4096 bytes / 4096 bytes Disk identifier: 0x00000000 Festplatte /dev/sdd enthält keine gültige Partitionstabelle
The only other way i can imagine would be creating another md1, adding the new drive to that, copy (rsync -avl) all files to the new md, repartition the old drive to fit the 4K blocksize, disassemble md0, and add the old drive to the new md1.
But this would take a lot of time, so i'd like to avoid that.
