[CentOS] openfiler (was: using CentOS as an iSCSI server?)

Les Mikesell lesmikesell at gmail.com
Tue Oct 20 21:08:35 UTC 2009

John R Pierce wrote:
> absolutely CRITICAL to any SAN implementations is that the storage 
> controller (iscsi target, be it openfiler or what) remain 100% rock 
> solid tsable at all times.
> you can NOT REboot a shared storage controller without shutting all 
> client  systems down first (or at least unmounting all SAN volumes)
> its non-trivial to implement a high availability  (active/standby) 
> storage controller with iscsi.    very hard, in fact. 
> commercial SANs are fully redundant, with redundant fiberchannel cards 
> on each client and storage controller, redundant fiberchannel switches, 
> redundant paths from the storage controllers to the actual drive arrays, 
> etc.   many of them shadow the writeback cache storage so if one 
> controller fails the other one has any write cached blocks and can post 
> them to the disk spindles transparently to maintain complete data 
> coherency.    Trying to achieve this level of 0.99999 uptime/reliability 
> with commodity hardware and software is not easy.

Has anyone tried doing it with this: http://www.nexenta.com/corp/?

   Les Mikesell
    lesmikesell at gmail.com

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