Re: [zfs-discuss] Best practices for zpools on zfs

2009-11-26 Thread Mike Gerdts
On Thu, Nov 26, 2009 at 8:53 PM, Toby Thain wrote: > > On 26-Nov-09, at 8:57 PM, Richard Elling wrote: > >> On Nov 26, 2009, at 1:20 PM, Toby Thain wrote: >>> >>> On 25-Nov-09, at 4:31 PM, Peter Jeremy wrote: >>> On 2009-Nov-24 14:07:06 -0600, Mike Gerdts wrote: > > ... fill a 128 >>

Re: [zfs-discuss] Best practices for zpools on zfs

2009-11-26 Thread Toby Thain
On 26-Nov-09, at 8:57 PM, Richard Elling wrote: On Nov 26, 2009, at 1:20 PM, Toby Thain wrote: On 25-Nov-09, at 4:31 PM, Peter Jeremy wrote: On 2009-Nov-24 14:07:06 -0600, Mike Gerdts wrote: ... fill a 128 KB buffer with random data then do bitwise rotations for each successive use of the

Re: [zfs-discuss] Best practices for zpools on zfs

2009-11-26 Thread Richard Elling
On Nov 26, 2009, at 1:20 PM, Toby Thain wrote: On 25-Nov-09, at 4:31 PM, Peter Jeremy wrote: On 2009-Nov-24 14:07:06 -0600, Mike Gerdts wrote: ... fill a 128 KB buffer with random data then do bitwise rotations for each successive use of the buffer. Unless my math is wrong, it should allow 1

Re: [zfs-discuss] Best practices for zpools on zfs

2009-11-26 Thread Toby Thain
On 25-Nov-09, at 4:31 PM, Peter Jeremy wrote: On 2009-Nov-24 14:07:06 -0600, Mike Gerdts wrote: ... fill a 128 KB buffer with random data then do bitwise rotations for each successive use of the buffer. Unless my math is wrong, it should allow 128 KB of random data to be write 128 GB of data

Re: [zfs-discuss] Best practices for zpools on zfs

2009-11-25 Thread Peter Jeremy
On 2009-Nov-24 14:07:06 -0600, Mike Gerdts wrote: >On Tue, Nov 24, 2009 at 1:39 PM, Richard Elling > wrote: >> Also, the performance of /dev/*random is not very good.  So prestaging >> lots of random data will be particularly challenging. This depends on the random number generation algorithm use

Re: [zfs-discuss] Best practices for zpools on zfs

2009-11-24 Thread Mike Gerdts
On Tue, Nov 24, 2009 at 1:39 PM, Richard Elling wrote: > On Nov 24, 2009, at 11:31 AM, Mike Gerdts wrote: > >> On Tue, Nov 24, 2009 at 9:46 AM, Richard Elling >> wrote: >>> >>> Good question!  Additional thoughts below... >>> >>> On Nov 24, 2009, at 6:37 AM, Mike Gerdts wrote: >>> Suppose I

Re: [zfs-discuss] Best practices for zpools on zfs

2009-11-24 Thread Richard Elling
On Nov 24, 2009, at 11:31 AM, Mike Gerdts wrote: On Tue, Nov 24, 2009 at 9:46 AM, Richard Elling wrote: Good question! Additional thoughts below... On Nov 24, 2009, at 6:37 AM, Mike Gerdts wrote: Suppose I have a storage server that runs ZFS, presumably providing file (NFS) and/or block (i

Re: [zfs-discuss] Best practices for zpools on zfs

2009-11-24 Thread Mike Gerdts
On Tue, Nov 24, 2009 at 9:46 AM, Richard Elling wrote: > Good question!  Additional thoughts below... > > On Nov 24, 2009, at 6:37 AM, Mike Gerdts wrote: > >> Suppose I have a storage server that runs ZFS, presumably providing >> file (NFS) and/or block (iSCSI, FC) services to other machines that

Re: [zfs-discuss] Best practices for zpools on zfs

2009-11-24 Thread Richard Elling
Good question! Additional thoughts below... On Nov 24, 2009, at 6:37 AM, Mike Gerdts wrote: Suppose I have a storage server that runs ZFS, presumably providing file (NFS) and/or block (iSCSI, FC) services to other machines that are running Solaris. Some of the use will be for LDoms and zones[

[zfs-discuss] Best practices for zpools on zfs

2009-11-24 Thread Mike Gerdts
Suppose I have a storage server that runs ZFS, presumably providing file (NFS) and/or block (iSCSI, FC) services to other machines that are running Solaris. Some of the use will be for LDoms and zones[1], which would create zpools on top of zfs (fs or zvol). I have concerns about variable block s