Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
On Tuesday 11 May 2010 20:54:14 Ryan Manikowski wrote: > On 5/11/2010 2:47 PM, Bart Coninckx wrote: > > On Tuesday 11 May 2010 19:28:46 Ryan Manikowski wrote: > >> On 5/11/2010 1:12 PM, Michael Iverson wrote: > >>> The interesting bit on the first link was the statement: > >>> > >>> "If active-active isn't possible, maybe there is distance involved and > >>> it's doing asynchronous replication, then you will need to implement > >>> something like heartbeat to add the volume using ietadm to the running > >>> iSCSI target once drbd B becomes primary..." > >>> > >>> The quote is a little short on implementation details, but based on > >>> it, and some snippets > >>> from the other links, it is the tool to dynamically add or remove > >>> volumes without messing > >>> with the remainder of the live volumes. > >>> > >>> The only challenge I see is that any changes that are made are > >>> dynamic, and would not > >>> survive a reboot or a daemon restart. So, somehow, upon a restart, the > >>> ietd daemon needs > >>> a method to reliably determine which volumes it should or should not > >>> be serving, or be > >>> told what to server by heartbeat or the state of the drbd volume. > >> > >> A bit off topic, but instead of using IETD as the target daemon, using > >> SCST will provide better performance. Also, for those looking into using > >> a drbd/heartbeat/iscsi solution to host Microsoft Hyper-V clusters, SCST > >> offers SCSI-3 compliant Persistent Reservations. IETD, to my knowledge, > >> does not support PR. > > > > True, but the integration with Heartbeat and SCST is poorly documented. > > Recently I found only one reference to a howto. > > > > B. > > Documentation I have written for Centos 5.x. Someone let me know where > to post it. howtoforger perhaps? > Definitely. B.