resize issue

[vatelzh]

Using gwcli to create rbd.disk1 with 10GB, and I want to resize it to 101GB, so I resize it as below:
/disks resize rbd.disk1 101G

I check the image info with rbd info disk1, and the size is 101GB.
I check the /sys/kernel/config/target/iscsi/
cat info
Status: ACTIVATED Max Queue Depth: 0 SectorSize: 512 HwMaxSectors: 128
Config: rbd/rbd/disk1;osd_op_timeout=30 Size: 108447924224

The problem is when I using iscsi initiator to login, I find the LUN size is still 10GB.
Is this a bug?

[mikechristie]

Resize is broken right now.

On newer kernels it will work, but can cause hangs if the device is blacklisted.

On older kernels you will not see the size updated like above.

If you reboot the gws then the new size would take affect and the initiator would see it when the device is rescanned.

[pcuzner]

@mikechristie should we disable resize for now to avoid issues with people testing?

[vatelzh]

On newer kernels it will work, but can cause hangs if the device is blacklisted.

@mikechristie which kernel version works? or which target patch should I apply in kernel?

[mikechristie]

@pcuzer, yeah it is probably best to just disable for now.

@vatelzh, there is no fix done yet. For my comment about it working I should have been more specific. If you use the kernel and patches listed in the tcmu-runner 1.3.0rc4 release notes then it would work under really specific conditions. It is not safe to use right now.

[pcuzner]

@mikechristie Ok. I have a patch for cli start up times, so once that's confirmed by vatelzh, let's get that merged, and then I'll drop resize out of the cli and api in a subsequent PR.

[mikechristie]

@pcuzner Do not worry about disabling resize. The PRs:

ceph/ceph-iscsi-config#43
ceph/ceph-iscsi-config#27
open-iscsi/tcmu-runner#346

should fix all the known issues except the one where a initiator could race with us. It could be rescanning the size on each path at the same time we are updating and the initiator could end up with a mismatch on different paths. For that race you currently have to initiate manual resize on the initiator side.

[mikechristie]

Resize should be working in the current release. Closing this issue.