Re: [zfs-discuss] Swapping disks in pool to facilitate pool growth
On Thu, Oct 7, 2010 at 12:22 AM, Kevin Walker indigoskywal...@gmail.com wrote: I would like to know if it is viable to add larger disks to zfs pool to grow the pool size and then remove the smaller disks? I would assume this would degrade the pool and require it to resilver? You can do a zfs replace without removing the the original disks as well if you have additional ports available. This will prevent the array from becoming degraded during the resilver. You may be able to replace more than one drive at the same time this way. I've never tried it, and you should test before attempting to do so. -B -- Brandon High : bh...@freaks.com ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Swapping disks in pool to facilitate pool growth
On Oct 27, 2010, at 21:17, Brandon High wrote: You may be able to replace more than one drive at the same time this way. I've never tried it, and you should test before attempting to do so. If the OP doesn't have a test system available, it may be possible to try this multi-replace experiment using plain files as the backing store (created with mkfile). ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Swapping disks in pool to facilitate pool growth
On Wed, Oct 27, 2010 at 3:56 PM, David Magda dma...@ee.ryerson.ca wrote: If the OP doesn't have a test system available, it may be possible to try this multi-replace experiment using plain files as the backing store (created with mkfile). .. or via a VirtualBox, VMWare, or other virtualization instance. -B -- Brandon High : bh...@freaks.com ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Swapping disks in pool to facilitate pool growth
Hi Guys, We are a running a Solaris 10 production server being used for backup services within our DC. We have 8 500GB drives in a zpool and we wish to swap them out 1 by 1 for 1TB drives. I would like to know if it is viable to add larger disks to zfs pool to grow the pool size and then remove the smaller disks? I would assume this would degrade the pool and require it to resilver? Any advice would be gratefully received. Kind regards Kevin ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Swapping disks in pool to facilitate pool growth
On 07/10/2010 11:22, Kevin Walker wrote: We are a running a Solaris 10 production server being used for backup services within our DC. We have 8 500GB drives in a zpool and we wish to swap them out 1 by 1 for 1TB drives. I would like to know if it is viable to add larger disks to zfs pool to grow the pool size and then remove the smaller disks? This is covered in the documentation: docs.sun.com Home Oracle Solaris 10 System Administrator Collection Oracle Solaris ZFS Administration Guide 1. Oracle Solaris ZFS File System (Introduction) What's New in ZFS? ZFS Device Replacement Enhancements http://docs.sun.com/app/docs/doc/819-5461/githb?l=ena=view I would assume this would degrade the pool and require it to resilver? A resilver is required without it there is no way to get your data on to the new drives. Wither the pool is degraded or not depends on wither you dettach an existing side of a two way mirror to do the replacement with the larger drive or if you create a three way mirror first and then dettach one of the size of the original two way mirror. -- Darren J Moffat ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
Re: [zfs-discuss] Swapping disks in pool to facilitate pool growth
From: zfs-discuss-boun...@opensolaris.org [mailto:zfs-discuss- boun...@opensolaris.org] On Behalf Of Kevin Walker We are a running a Solaris 10 production server being used for backup services within our DC. We have 8 500GB drives in a zpool and we wish to swap them out 1 by 1 for 1TB drives. I would like to know if it is viable to add larger disks to zfs pool to grow the pool size and then remove the smaller disks? I would assume this would degrade the pool and require it to resilver? Because it's a raidz, yes it will be degraded each time you remove one disk. You will not be using attach and detach. You will be using replace Because it's a raidz, each resilver time will be unnaturally long. Raidz resilver code is inefficient. Just be patient and let it finish each time before you replace the next disk. Performance during resilver will be exceptionally poor. Exceptionally. Because of the inefficient raidz resilver code, do everything within your power to reduce IO on the system during the resilver. Of particular importance: Don't create snapshots while the system is resilvering. This will exponentially increase the resilver time. (I'm exaggerating by saying exponentially, don't take it literally. But in reality, it *is* significant.) Because you're going to be degrading your redundancy, you *really* want to ensure all the disks are good before you do any degrading. This means, don't begin your replace until after you've completed a scrub. ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
