Re: [zfs-discuss] ZFS and aging

2008-12-17 Thread Tim
On Wed, Dec 17, 2008 at 9:09 AM, Johan Hartzenberg wrote: > > On Wed, Dec 17, 2008 at 2:46 PM, Thanos McAtos wrote: > >> >> >> My problems are 2: >> >> 1) I don't know how to properly age a file-system. As already said, I need >> traces of a decade's workload to properly do this, and to the best o

Re: [zfs-discuss] ZFS and aging

2008-12-17 Thread Johan Hartzenberg
On Wed, Dec 17, 2008 at 2:46 PM, Thanos McAtos wrote: > > > My problems are 2: > > 1) I don't know how to properly age a file-system. As already said, I need > traces of a decade's workload to properly do this, and to the best of my > knowledge there is no easy way to do this automatically. > > 2

Re: [zfs-discuss] ZFS and aging

2008-12-17 Thread Thanos McAtos
I followed Anton's idea but didn't see any difference. My tests were repetitive PostMark runs, and each run was different. For instance, I didn't let PostMark delete the files once it finished, deleted the odd numbered ones by hand, put the rest in a different directory, re-run PostMark that fa

Re: [zfs-discuss] ZFS and aging

2008-12-16 Thread Johan Hartzenberg
On Mon, Dec 15, 2008 at 7:57 PM, Thanos McAtos wrote: > Hello all. > > I'm doing a course project to evaluate recovery time of RAID-Z. > > One of my tests is to examine the impact of aging on recovery speed. > > I've used PostMark to stress the file-system but I didn't observe any > noticeable sl

Re: [zfs-discuss] ZFS and aging

2008-12-15 Thread Anton B. Rang
Typically you want to do something like this: Write 1,000,000 files of varying length. Randomly select and remove 500,000 of those files. Repeat (a) creating files, and (b) randomly removing files, until your file system is full enough for your test, or you run out of time. That's a pretty

[zfs-discuss] ZFS and aging

2008-12-15 Thread Thanos McAtos
Hello all. I'm doing a course project to evaluate recovery time of RAID-Z. One of my tests is to examine the impact of aging on recovery speed. I've used PostMark to stress the file-system but I didn't observe any noticeable slowdown. Is there a better way to "age" a ZFS file-system? Does ZFS