Re: [zfs-discuss] ZFS on partitions

On Thu, Jan 15, 2009 at 21:51, wrote: > > >>The performance issue of using a drive to multiple unrelated >>consumers (ZFS & UFS) is that, if both are active at the >>same time, this will defeat the I/O scheduling smarts >>implemented in ZFS. Rather than have data streaming to some >>p

Re: [zfs-discuss] ZFS on partitions

>The performance issue of using a drive to multiple unrelated >consumers (ZFS & UFS) is that, if both are active at the >same time, this will defeat the I/O scheduling smarts >implemented in ZFS. Rather than have data streaming to some >physical location of the rust, the competitio

Re: [zfs-discuss] ZFS on partitions

Tim writes: > On Tue, Jan 13, 2009 at 6:26 AM, Brian Wilson wrote: > > > > > Does creating ZFS pools on multiple partitions on the same physical drive > > still run into the performance and other issues that putting pools in > > slices > > does? > > > > > Is zfs going to own the whol

Re: [zfs-discuss] ZFS on partitions

For the sake of curiosity, is it safe to have components of two different ZFS pools on the same drive, with and without HDD write cache turned on? How will ZFS itself behave, would it turn on the disk cache if the two imported pools co-own the drive? An example is a multi-disk system like mine

Re: [zfs-discuss] ZFS on partitions

>ZFS does turn it off if it doesn't have the whole disk. That's where the >performance issues come from. But it doesn't "touch it" so ZFS continues to work if you enable write caching. And I think we default to "write-cache" enabled for ATA/IDE disks. (The reason is that they're shipped with

Re: [zfs-discuss] ZFS on partitions

>> >> ZFS will always flush the disk cache at appropriate times. If ZFS >> thinks that is alone it will turn the write cache on the disk on. > > I'm not sure if you're trying to argue or agree. If you're trying to argue, > you're going to have to do a better job than "zfs will always flush disk >

Re: [zfs-discuss] ZFS on partitions

?? Tim wrote: > On Wed, Jan 14, 2009 at 2:40 PM, Mattias Pantzare > wrote: > > On Wed, Jan 14, 2009 at 20:03, Tim > wrote: > > > > > > On Tue, Jan 13, 2009 at 6:26 AM, Brian Wilson > mailto:bfwil...@doit.wisc.edu>> >

Re: [zfs-discuss] ZFS on partitions

On Wed, Jan 14, 2009 at 2:40 PM, Mattias Pantzare wrote: > On Wed, Jan 14, 2009 at 20:03, Tim wrote: > > > > > > On Tue, Jan 13, 2009 at 6:26 AM, Brian Wilson > > wrote: > >> > >> Does creating ZFS pools on multiple partitions on the same physical > drive > >> still run into the performance and

Re: [zfs-discuss] ZFS on partitions

On Wed, Jan 14, 2009 at 2:48 PM, Miles Nordin wrote: > but, the write cache on/offness is a stateful setting stored on the > disk platter, right? so it survives reboots of the disk, and ZFS > doesn't turn it off, and UFS arguably should turn it off but > doesn't---once you've dedicated a disk to

Re: [zfs-discuss] ZFS on partitions

but, the write cache on/offness is a stateful setting stored on the disk platter, right? so it survives reboots of the disk, and ZFS doesn't turn it off, and UFS arguably should turn it off but doesn't---once you've dedicated a disk to ZFS, you have to turn the write cache off yourself somehow usi

Re: [zfs-discuss] ZFS on partitions

On Wed, Jan 14, 2009 at 20:03, Tim wrote: > > > On Tue, Jan 13, 2009 at 6:26 AM, Brian Wilson > wrote: >> >> Does creating ZFS pools on multiple partitions on the same physical drive >> still run into the performance and other issues that putting pools in slices >> does? > > > Is zfs going to own

Re: [zfs-discuss] ZFS on partitions

On Tue, Jan 13, 2009 at 6:26 AM, Brian Wilson wrote: > > Does creating ZFS pools on multiple partitions on the same physical drive > still run into the performance and other issues that putting pools in slices > does? > Is zfs going to own the whole drive or not? The *issue* is that zfs will no

[zfs-discuss] ZFS on partitions

Does creating ZFS pools on multiple partitions on the same physical drive still run into the performance and other issues that putting pools in slices does? ___ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/lis