Hi, I've installed drbd version 8.3.13 on a couple of machines running centos 5.8. I already have data on a logical volume on the primary and I had no space for a meta disk, so I've done the following:
* umount my data LV * full fsck of the LV * resize it down by 1GB * mount it successfully and write to it for a few days without error And then I created a second 1GB LV out of the same VG for later use as the drbd meta disk. And then tonight I did the following: * unmounted my LV * configured drbd to use meta data on a second LV (created out of the 1GB now free in the VG) * setup both primary and secondary * started the syncing in the correct direction. At this point everything looked good (watching /proc/drbd). I'm using protocol A and the sync is going to take a few days. Then I tried to mount /dev/drbd1 and use it, the mount worked ok but writing to it changed it to be RO. A bit of poking around shows that a fdisk -l of /dev/drbd1 shows a very different size to that of the underlying LV: [root@nhr-b02 /]# fdisk -l /dev/DataVG01/DataLV01 Disk /dev/DataVG01/DataLV01: 5988.1 GB, 5988119740416 bytes 255 heads, 63 sectors/track, 728014 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/DataVG01/DataLV01 doesn't contain a valid partition table [root@nhr-b02 /]# fdisk -l /dev/drbd1 Disk /dev/drbd1: 4396.8 GB, 4396838551552 bytes 255 heads, 63 sectors/track, 534551 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Disk /dev/drbd1 doesn't contain a valid partition table As you can see the drbd device is 1.5TB less than the underlying LV! [root@nhr-b02 /]# lvdisplay /dev/DataVG01/DataLV01 --- Logical volume --- LV Name /dev/DataVG01/DataLV01 VG Name DataVG01 LV UUID YoBNvQ-IP2p-tCh8-6rwp-emaq-QVYo-nrw4sI LV Write Access read/write LV Status available # open 1 LV Size 5.45 TB Current LE 1427679 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:2 This is the meta disk device, 1GB [root@nhr-b02 /]# lvdisplay /dev/DataVG01/DataLV01-meta --- Logical volume --- LV Name /dev/DataVG01/DataLV01-meta VG Name DataVG01 LV UUID hGkn51-vxpj-fz9N-t2Lh-GDOL-9nwe-PELT95 LV Write Access read/write LV Status available # open 1 LV Size 1.00 GB Current LE 256 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:3 Does anybody know what is likely to cause this? I've halted the sync until I can figure this out! r.
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