Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On 25 Mar 2017 8:16 pm, "Marco Marino" <marino.mrc at gmail.com> wrote: Hi, I'm trying to understand how to configure raw devices when used with drbd. I think I have a problem with data alignment. Let me describe my case: I have a raw device /dev/sde on both nodes and on top of it there is the drbd device. So, in the .res configuration file I have .... disk /dev/sde; device /dev/drbd2; .... At this point I used /dev/drbd2, *without create any partition,* as a backstore in the targetcli. On the iscsi initiator appeared one new device (/dev/sdf), and on top of it I create a new partition with type = LVM and finally a new PV, VG and many LVs. >From the iscsi initiator it seems to be ok: [root at cv1 ~]# gdisk /dev/sdf GPT fdisk (gdisk) version 0.8.6 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Command (? for help): p Disk /dev/sdf: 7808351448 <(780)%20835-1448> sectors, 3.6 TiB Logical sector size: 512 bytes Disk identifier (GUID): D5C7161E-5C4C-42B3-BEDE-520DC049D106 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 7808351414 <(780)%20835-1414> Partitions will be aligned on 2048-sector boundaries Total free space is 3221 sectors (1.6 MiB) Number Start (sector) End (sector) Size Code Name 1 2048 7808350207 <(780)%20835-0207> 3.6 TiB 8E00 primary Command (? for help): q [root at cv1 ~]# The problem is on the drbd node where I have: [root at iscsi2 ~]# lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT ........ sde 8:64 0 3,7T 0 disk ├─sde1 8:65 0 3,7T 0 part └─drbd2 147:2 0 3,7T 0 disk [root at iscsi2 ~]# Futrhermore [root at iscsi2 ~]# gdisk /dev/sde GPT fdisk (gdisk) version 0.8.6 Partition table scan: MBR: protective BSD: not present APM: not present GPT: present Found valid GPT with protective MBR; using GPT. Command (? for help): p Disk /dev/sde: 7808589824 <(780)%20858-9824> sectors, 3.6 TiB Logical sector size: 512 bytes Disk identifier (GUID): D5C7161E-5C4C-42B3-BEDE-520DC049D106 Partition table holds up to 128 entries First usable sector is 34, last usable sector is 7808351414 <(780)%20835-1414> Partitions will be aligned on 2048-sector boundaries Total free space is 3221 sectors (1.6 MiB) Number Start (sector) End (sector) Size Code Name 1 2048 7808350207 <(780)%20835-0207> 3.6 TiB 8E00 primary Command (? for help): q [root at iscsi2 ~]# It seems that there are 2 "partitions" even though drbd2 is not a partition. Is this a problem related to my configuration? What do you mean 2 partitions? It is a partition on sde you created on the client and the drbd device itself. The lsblk shows you exactly that. My question is: how can I solve? Should I create a new partition on /dev/sde and use /dev/sde1 as a backing device for the drbd resource? Or perhaps should I create a partition on top of /dev/drbd2 before I can use the device as a backstore in targetcli?? Thank you, Marco _______________________________________________ drbd-user mailing list drbd-user at lists.linbit.com http://lists.linbit.com/mailman/listinfo/drbd-user -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.linbit.com/pipermail/drbd-user/attachments/20170328/4c3c3e86/attachment.htm>