You will likely have to recompile your kernel. For LIO, recent kernels should have the option available. For SCST, you'll need compile your kernel with some patches and likely some userspace components. If you look at the SCST user guide docs, I've verified that they are correct and work with rbd (at least for rhel-based systems, but they should also work for other distros). http://iscsi-scst.sourceforge.net/iscsi-scst-howto.txt On Tue, Dec 6, 2011 at 6:00 PM, <Eric_YH_Chen@xxxxxxxxxxx> wrote: > Hi, Brian: > > I would like to use SCST target or LIO target. > But I found they are not supported on ubuntu 11.10 server. > (LIO iSCSI is released under 3.1 kernel, but 11.10 server uses 3.0 kernel) > Could you kindly to share how to use SCST target or LIO target on ubuntu ? > > I try the multipath with STGT, however, but it doesn't work well. > I think that is because it doesn't support BLOCKIO, am I right? > > Thanks! > > -----Original Message----- > From: Brian Chrisman [mailto:brchrisman@xxxxxxxxx] > Sent: Wednesday, December 07, 2011 12:01 AM > To: Eric YH Chen/WHQ/Wistron > Cc: wido@xxxxxxxxx; ceph-devel@xxxxxxxxxxxxxxx; Chris YT Huang/WHQ/Wistron > Subject: Re: How to sync data on different server but with the same image > > Eric, > If you export the rbd device directly via your iSCSI target driver, it > should work. > I verified this with the SCST target, but the LIO target should work as well. > As Wido said, you don't want to mount the same rbd device on multiple > clients without a shared filesystem (and in that case, you might as > well use cephfs), but exporting rbd over iSCSI works. > > > On Tue, Dec 6, 2011 at 1:38 AM, <Eric_YH_Chen@xxxxxxxxxxx> wrote: >> Hi, Wido: >> >> This is a preliminary experiment before implement iSCSI High Available multipath. >> http://ceph.newdream.net/wiki/ISCSI >> >> Therefore, we use Ceph as rbd device instead of file system. >> >> >> -----Original Message----- >> From: Wido den Hollander [mailto:wido@xxxxxxxxx] >> Sent: Tuesday, December 06, 2011 5:33 PM >> To: Eric YH Chen/WHQ/Wistron; ceph-devel@xxxxxxxxxxxxxxx >> Cc: Chris YT Huang/WHQ/Wistron >> Subject: Re: How to sync data on different server but with the same image >> >> Hi, >> >> ----- Original message ----- >>> Dear All: >>> >>> I map the same rbd image to the rbd device on two different servers. >>> >>> For example: >>> 1. create rbd image named foo >>> 2. map foo to /dev/rbd0 on server A, mount /dev/rbd0 to /mnt >>> 3. map foo to /dev/rbd0 on server B, mount /dev/rbd0 to /mnt >>> >>> If I put add a file to /mnt via server A, I hope I can see the same >>> file on server B. >>> However, I can't see it until I umount /mnt on server A and re-mount >>> /mnt on server B. >> >> You'd have to use an cluster filesystem like GFS or OCFS2 to let this work. >> >> But why not use Ceph as a filesystem instead of RBD? That seems to do what you want. >> >> Wido >> >>> >>> Do you have any comment about this scenario? How could I force the >>> data synchronization? >>> >>> Actually, I want to implement the iSCSI High Available multipath on >>> http://ceph.newdream.net/wiki/ISCSI. >>> Therefore, I tried this small experiment first, but fail. Would you >>> please give me some suggestion before I start to implement it? Thanks! >>> -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
