Hi, I am looking for some best practice advice on a project that i am working on.
We are looking at migrating ~40TB backup data to ZFS, with an annual data growth of 20-25%. Now, my initial plan was to create one large pool comprised of X RAIDZ-2 vdevs ( 7 + 2 ) with one hotspare per 10 drives and just continue to expand that pool as needed. Between calculating the MTTDL and performance models i was hit by a rather scary thought. A pool comprised of X vdevs is no more resilient to data loss than the weakest vdev since loss of a vdev would render the entire pool unusable. This means that i potentially could loose 40TB+ of data if three disks within the same RAIDZ-2 vdev should die before the resilvering of at least one disk is complete. Since most disks will be filled i do expect rather long resilvering times. We are using 750 GB Seagate (Enterprise Grade) SATA disks for this project with as much hardware redundancy as we can get ( multiple controllers, dual cabeling, I/O multipathing, redundant PSUs, etc.) I could use multiple pools but that would make data management harder which in it self is a lengthy process in our shop. The MTTDL figures seem OK so how much should i need to worry ? Anyone having experience from this kind of setup ? /Don E. This message posted from opensolaris.org _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
