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

Benjamin Franz jfranz at freerun.com
Wed Oct 21 01:22:31 UTC 2009

John R Pierce wrote:
> nate wrote:
>> Network RAID – only available from HP
> Fantasy ideas (eg, I've only thought of this and never tried it). YMMV, 
> caveat emptor, objects in mirror may be closer than they appear, etc etc.
> 1) two ISCSI servers, each with identical storage. each offers the same 
> sized iscsi target to the host. the host uses mdraid 1 to mirror these.

I've done it experimentally. It worked.  Obviously you can't share a 
raid volume with multiple client hosts.

> 2) two ISCSI servers, each with identical storage, configured as 
> active-standby cluster, using conventional cluster management software. 
> active 'master' replicates block storage to 'slave' using DRBD.

I've done this too (active-active using RH Cluster and GFS). I gave up 
finally because I just couldn't get reliable multipathing. The paths 
would keep locking up in weird ways, fail to come up (randomly), and all 
kinds of hate and discontent. :(

Benjamin Franz

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