Re: Quorum and ZFS. PGR is a property of the scsi devices in the zpool, not a property of ZFS or the zpool. The same is true for SCSI 2 reserve/release protocol. The PGRE protocol requires a reserved part of the disk. However, this reserved part of the disk is reserved at the "label" level. While it is not part of the label itself, the Solaris label reserves a few tracks of the disk for use by PGRE. Therefor, it should be possible to use a disk that is in the zpool as a quorum device for both PGR and PGRE situations.
Re: Why doesn't GFS (PxFS) just work on zfs. Given that PxFS just works at the vfs layer, I would have thought that this would have "just worked". However, it turns out that PxFS has too much knowledge of the interaction if the filesystem and the virtual memory system for this to work. I think the biggest problem was the variable blocksize feature of ZFS. It is possible that PxFS will be made to work with ZFS, but I doubt it. The current direction is more towards making ZFS itself a "cluster filesystem" so that all of the advantages of ZFS can be utilized without being hampered by a layered filesystem. If you need more details about why PxFS did not work with ZFS, contact me, and I will try to get more details. -Charles >Date: Tue, 30 May 2006 10:30:14 -0700 (PDT) >From: Tatjana S Heuser <[EMAIL PROTECTED]> >Subject: [zfs-discuss] Re: ZFS and Sun Cluster.... >To: zfs-discuss@opensolaris.org >MIME-version: 1.0 >Content-transfer-encoding: 7BIT >X-BeenThere: zfs-discuss@opensolaris.org >Delivered-to: zfs-discuss@opensolaris.org >X-PMX-Version: 5.1.2.240295 >X-Original-To: zfs-discuss@opensolaris.org >X-OpenSolaris-URL: >http://www.opensolaris.org/jive/message.jspa?messageID=40507&tstart=0#40507 >X-Mailman-Version: 2.1.4 >List-Post: <mailto:zfs-discuss@opensolaris.org> >List-Subscribe: <http://mail.opensolaris.org/mailman/listinfo/zfs-discuss>, <mailto:[EMAIL PROTECTED]> >List-Unsubscribe: <http://mail.opensolaris.org/mailman/listinfo/zfs-discuss>, <mailto:[EMAIL PROTECTED]> >List-Archive: <http://mail.opensolaris.org/pipermail/zfs-discuss> >List-Help: <mailto:[EMAIL PROTECTED]> >List-Id: zfs-discuss.opensolaris.org > >> SunCluster will support ZFS in our 3.2 release of SunCluster, >> via the HAStoragePlus resource type. This support will be for >> failover use only, not scaleable or active-active applications. > >What about quorum reservation in ZFS storage pools. >AFAIK ZFS does not support SCSI3 persistent group reservation (PGR) >Will that be emulated? As also done on SCSI2 with PGRE ? >Why is there no storage communication via the ORB as we had it in >SunCluster 3.1 with SDS or Veritas since global storage actually is a >virtual layer above the raid sw layer. Why doesn't that work with ZFS. >Any information/clues? The limitations mentioned do sound strange to me. >Is it planned to have the cluster fs or proxy fs layer between the ZFS layer >and the Storage pool layer? > >This sounds exciting and I'm eager to learn more about this. FEED ME :) > >Sorry if the questions in question may sound a bit too detailed, my knowledge >base is SunCluster 3.1 and I'm currently proof-reading parts of Rolfs book on >SunCluster which is scheduled to be released Q1/2007. > >Tatjana > > >This message posted from opensolaris.org >_______________________________________________ >zfs-discuss mailing list >zfs-discuss@opensolaris.org >http://mail.opensolaris.org/mailman/listinfo/zfs-discuss _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
