At 06:57 AM 3/12/2010, Marcus Bointon wrote:
I'm just wondering how gluster and iscsi might work together. I suspect that in many situations they could be used interchangeably, but how about them working together? If a setup providing a gluster AFR service was on top of remote iSCSI targets, would protocol overhead become a serious problem?
you'll have a number of performance problems here. iSCSI is a synchronous protocol, so even if you have an efficient filesystem on top of it (zfs, xfs, etc.) you'll still have latency that would be much worse than, say, NFS. You should get better performance, however, than something like DRBD or some other remote block device method. Whatever you have providing the iSCSI targets should be write-cache capable and whatever filesystem you put on top of the targets should be write-cache aware. These will help reduce the performance issues you may experience.
It was already recommended, but you'll be better off running gluster directly from your iSCSI target rather than using a remote iSCSI target for a local Gluster store.
Keith
Marcus -- Marcus Bointon Synchromedia Limited: Creators of http://www.smartmessages.net/ UK resellers of i...@hand CRM solutions [email protected] | http://www.synchromedia.co.uk/ _______________________________________________ Gluster-users mailing list [email protected] http://gluster.org/cgi-bin/mailman/listinfo/gluster-users
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