[zfs-discuss] ZFS concat pool
I have a need to created pool that only concatenates the LUNS assigned to it. The default for a pool is stripe and other possibilities are mirror, raidz and raidz2. Is there any way I can create concat pools. Main reason is that the underlying LUNs are already striping and we do not want to stripe in ZFS *and* in the storage cabinet (internal politics). To my knowledge the only other possibility (if ZFS can't do it) is using SVM. Greetings, Peter -- This message posted from opensolaris.org ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] ZFS concat pool
On Wed, Jan 28, 2009 at 07:37, Peter van Gemert opensola...@petervg.nl wrote:
Is there any way I can create concat pools.
Not that I'm aware of. However, pools that are not redundant at the
zpool level (i.e., mirror or raidz{,2}) are prone to becoming
irrevocably faulted; creating non-redundant pools, even on
intelligent storage arrays, is thus not recommended.
Main reason is that the underlying LUNs are already striping and we do not
want to stripe in ZFS *and* in the storage cabinet (internal politics).
What reasons are there for not doing so? Perhaps if we know more
about the situation we can suggest alternative configurations.
Will
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Re: [zfs-discuss] ZFS concat pool
On Wed, 28 Jan 2009, Peter van Gemert wrote: I have a need to created pool that only concatenates the LUNS assigned to it. The default for a pool is stripe and other possibilities are mirror, raidz and raidz2. Zfs does concatenate vdevs, and load-shares the writes across vdevs. If each vdev is one disk or one LUN, then you have concatenation and not striping. Bob == Bob Friesenhahn bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/ GraphicsMagick Maintainer,http://www.GraphicsMagick.org/ ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] ZFS concat pool
Peter van Gemert wrote: I have a need to created pool that only concatenates the LUNS assigned to it. The default for a pool is stripe and other possibilities are mirror, raidz and raidz2. Is there any way I can create concat pools. Main reason is that the underlying LUNs are already striping and we do not want to stripe in ZFS *and* in the storage cabinet (internal politics). Nobody has provided a convincing use case to justify concats, so they don't exist. In the bad old days, logical volume managers did concats because they could not dynamically stripe. ZFS does dynamic striping (!= RAID-0) so it doesn't have the capacity issues caused by RAID-0. -- richard To my knowledge the only other possibility (if ZFS can't do it) is using SVM. Greetings, Peter ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
