Re: [zfs-discuss] ZFS memory recommendations

2010-05-20 Thread Miles Nordin
et == Erik Trimble erik.trim...@oracle.com writes: et No, you're reading that blog right - dedup is on a per-pool et basis. The way I'm reading that blog is that deduped data is expaned in the ARC. pgpozjcLXZlNV.pgp Description: PGP signature

Re: [zfs-discuss] ZFS memory recommendations

2010-05-20 Thread Erik Trimble
Miles Nordin wrote: et == Erik Trimble erik.trim...@oracle.com writes: et No, you're reading that blog right - dedup is on a per-pool et basis. The way I'm reading that blog is that deduped data is expaned in the ARC. What I think is being done is this: for pool A and

[zfs-discuss] ZFS memory recommendations

2010-05-19 Thread Deon Cui
I am currently doing research on how much memory ZFS should have for a storage server. I came across this blog http://constantin.glez.de/blog/2010/04/ten-ways-easily-improve-oracle-solaris-zfs-filesystem-performance It recommends that for every TB of storage you have you want 1GB of RAM just

Re: [zfs-discuss] ZFS memory recommendations

2010-05-19 Thread Bob Friesenhahn
On Wed, 19 May 2010, Deon Cui wrote: http://constantin.glez.de/blog/2010/04/ten-ways-easily-improve-oracle-solaris-zfs-filesystem-performance It recommends that for every TB of storage you have you want 1GB of RAM just for the metadata. Interesting conclusion. Is this really the case that

Re: [zfs-discuss] ZFS memory recommendations

2010-05-19 Thread Roy Sigurd Karlsbakk
- Deon Cui deon@gmail.com skrev: I am currently doing research on how much memory ZFS should have for a storage server. I came across this blog http://constantin.glez.de/blog/2010/04/ten-ways-easily-improve-oracle-solaris-zfs-filesystem-performance It recommends that for every

Re: [zfs-discuss] ZFS memory recommendations

2010-05-19 Thread Erik Trimble
Bob Friesenhahn wrote: On Wed, 19 May 2010, Deon Cui wrote: http://constantin.glez.de/blog/2010/04/ten-ways-easily-improve-oracle-solaris-zfs-filesystem-performance It recommends that for every TB of storage you have you want 1GB of RAM just for the metadata. Interesting conclusion.

Re: [zfs-discuss] ZFS memory recommendations

2010-05-19 Thread Miles Nordin
et == Erik Trimble erik.trim...@oracle.com writes: et frequently-accessed files from multiple VMs are in fact et identical, and thus with dedup, you'd only need to store one et copy in the cache. although counterintuitive I thought this wasn't part of the initial release. Maybe I'm

Re: [zfs-discuss] ZFS memory recommendations

2010-05-19 Thread Erik Trimble
Miles Nordin wrote: et == Erik Trimble erik.trim...@oracle.com writes: et frequently-accessed files from multiple VMs are in fact et identical, and thus with dedup, you'd only need to store one et copy in the cache. although counterintuitive I thought this wasn't part