Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
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? -- Ryan Manikowski ryan at devision.us | 716.771.2282