So, if I may, is this the correct summary of the answer to original question (on JBOD for a ZFS HA cluster): === SC847E26-RJBOD1 with dual-ported SAS drives are known to work in a failover HA storage scenario, allowing both servers (HBAs) access to each single SAS drive individually, so zpools can be configured from any disks regardless of which backplane they are connected to. HA Clusterware, such as NexentaStor HA-Cluster plugin should be used to ensure that only one head node actually uses a given disk drive in an imported ZFS pool. === Is the indented statement correct? :) Other questions: What clusterware would be encouraged now for OpenIndiana boxes? Also, in case of clustered shared filesystems (like VMWare vmfs) can these JBODs allow two different servers to access one drive simultaneously in a safe manner (do they do fencing, reservations and other SCSI magic)? > > Following up on some of this forum's discussions, I read the > manuals on SuperMicro's > > SC847E26-RJBOD1 this weekend. > > We see quite a few of these in the NexentaStor installed base.
> The NexentaStor HA-Cluster plugin manages STONITH and reservations. > I do not believe programming expanders or switches for > clustering is the best approach. > It is better to let the higher layers manage this. > The cost of a SATA disk + SATA/SAS interposer is about the same > as a native SAS > drive. Native SAS makes a better solution. > -- +============================================================+ | | | Климов Евгений, Jim Klimov | | технический директор CTO | | ЗАО "ЦОС и ВТ" JSC COS&HT | | | | +7-903-7705859 (cellular) mailto:jimkli...@cos.ru | | CC:ad...@cos.ru,jimkli...@gmail.com | +============================================================+ | () ascii ribbon campaign - against html mail | | /\ - against microsoft attachments | +============================================================+
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