ZFS Recovery Tools

[Valentin Bud]

On Thu, Nov 20, 2008 at 11:31 PM, Wojciech Puchar
<wojtek at wojtek.tensor.gdynia.pl> wrote:
>
>> Hi,
>>  I was just reading stuff about ZFS, and wonder if it would be
>> beneficial for me to use it. I store a lots of multimedia files in my
>> HD, they usually have the size of > 1GB (e.g. 1.2, 1.7 or even
>> bigger), and my system is running UFS.
>
> simply use UFS with big blocks (-b 65536 -f 8192) will be OK.
>
> BTW i have such change in param.h on every system i have:
>
> --- param.h~    2008-10-09 20:49:54.000000000 +0200
> +++ param.h     2008-10-09 20:49:54.000000000 +0200
> @@ -121,7 +121,7 @@
>  #define DFLTPHYS       (64 * 1024)     /* default max raw I/O transfer size
> */
>  #endif
>  #ifndef MAXPHYS
> -#define MAXPHYS                (128 * 1024)    /* max raw I/O transfer size
> */
> +#define MAXPHYS                (1024 * 1024)    /* max raw I/O transfer
> size */

What does MAXPHYS mean (yes max raw I/O transfer) and do? A little
bit more specific if you may.
thank you.

>  #endif
>  #ifndef MAXDUMPPGS
>  #define MAXDUMPPGS     (DFLTPHYS/PAGE_SIZE)
>
>
> no idea why it's not the default.
>
>
>
>>  so can I buy a new HD, say 500GB, and format it ZFS style and use it
>> along with other UFS? and will ZFS performs better than UFS in my
>
> there may be slight (if any) speedup with transfer speed, and HUGE (like
> 10x) increase in CPU load. on slower CPUs transfers will be actually slower.
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