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Thread: [storage-discuss] [ha-clusters-discuss] Possible to have a HA iSCSI cluster (using ZFS) ?

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Permlink Replies: 2 - Last Post: Nov 6, 2009 8:00 AM by: jdunham
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[storage-discuss] [ha-clusters-discuss] Possible to have a HA iSCSI cluster (using ZFS) ?
Posted: Nov 5, 2009 5:21 PM

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javen

Posts: 52
From: CN

Registered: 5/29/06
Re: [storage-discuss] [ha-clusters-discuss] Possible to have a HA iSCSI cluster (using ZFS) ?
Posted: Nov 5, 2009 5:22 PM   in response to: Guest

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You might need to send email to storage-discuss to query how well Solaris iSCSI target and COMSTAR support SCSI reservation and SCSI 3 PGR. I think if SCSI 2 reservation and SCSI3 PGR are supported well, you are suppose to setup a iSCSI HA cluster successfully.

Javen

2009/11/5 Andy Coates <andy dot coates at corealtitude dot com>
Hey,

I've been digging around for ages now trying to find the answer, but keep hitting old resources saying iSCSI targets not tested yet etc.

Basically is it possible yet to build a HA iSCSI cluster?  There seems to be so many different projects that cover part of the process (e.g. COMSTAR) but I can't seem to find a way of combining it all to provide a fully redundant, seamless failover storage system.

The fact that products like Nexentastor exist seems to hint that its not possible with current open projects?

Thanks in advance,
Andy.
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jdunham

Posts: 305
From: US

Registered: 3/9/05
Re: [storage-discuss] [ha-clusters-discuss] Possible to have a HA iSCSI cluster (using ZFS) ?
Posted: Nov 6, 2009 8:00 AM   in response to: javen

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 Javen Wu wrote:

You might need to send email to storage-discuss to query how well Solaris iSCSI target and COMSTAR support SCSI reservation and SCSI 3 PGR. I think if SCSI 2 reservation and SCSI3 PGR are supported well, you are suppose to setup a iSCSI HA cluster successfully.

Yes, COMSTAR's LU provider supports SCSI 3 PGR, but this is a SCSI Target property.

HA iSCSI Clusters is an iSCSI Initiator side problem set, where not only is there a requirement for SCSI-3 PGR, but also HA support for the TCP/IP path between the iSCSI Initiator and iSCSI Target. 


Javen

2009/11/5 Andy Coates <andy dot coates at corealtitude dot com>
Hey,

I've been digging around for ages now trying to find the answer, but keep hitting old resources saying iSCSI targets not tested yet etc.

Basically is it possible yet to build a HA iSCSI cluster?  There seems to be so many different projects that cover part of the process (e.g. COMSTAR) but I can't seem to find a way of combining it all to provide a fully redundant, seamless failover storage system.

The fact that products like Nexentastor exist seems to hint that its not possible with current open projects?

Thanks in advance,
Andy.
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Javen Wu
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Jim Dunham 
Engineering Manager
Core I/O - COMSTAR
Open Storage Systems Group

Sun Microsystems, Inc.
45 Network Drive
Burlington, MA 01803 USA
Phone x53360 / +1 (781) 730-4006
Email: James dot Dunham at Sun dot COM


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