zfs discuss - Mar 2006 - > 1TB filesystems with ZFS and 32-bit Solaris?

Solaris in 32-bit mode has a 1TB device limit. UFS filesystems in 32-bit 
mode also have a 1TB limit, even if using a logical volume manager to 
span smaller than 1TB devices.

So, what kind of limit does ZFS have when running under 32-bit Solaris?

-- 
Erik Trimble
Java System Support
Mailstop:  usca14-102
Phone:  x17195
Santa Clara, CA

> Solaris in 32-bit mode has a 1TB device limit. UFS filesystems in 32-bit 
> mode also have a 1TB limit, even if using a logical volume manager to 
> span smaller than 1TB devices.
> 
> So, what kind of limit does ZFS have when running under 32-bit Solaris?
It''s 64-bit, as long as your application is "large-file
aware".
See the largefile(5) and lfcompile(5) man pages for details.

Note: internally, ZFS supports full 64-bit offsets. POSIX, however,
defines offset_t to be signed, so the actual limit is 63-bit (2^63 - 1).

	$ mkfile -n $(((1 << 63) - 1)) huge
	$ ls -l huge
	-rw-------   1 bonwick  staff    9223372036854775807 Mar 16 23:07 huge

Or perhaps more helpfully, using -h:

	$ ls -lh huge
	-rw-------   1 bonwick  staff       8.0E Mar 16 23:07 huge

Jeff

So, I''m inferring that filesystem size is also 2^64 blocks (or is it 
2^128 blocks) maximum, even while on a normally 32-bit system?

Erik Trimble
Java System Support
Mailstop:  usca14-102
Phone:  x17195
Santa Clara, CA



Jeff Bonwick wrote:
>>Solaris in 32-bit mode has a 1TB device limit. UFS filesystems in 32-bit
>>mode also have a 1TB limit, even if using a logical volume manager to 
>>span smaller than 1TB devices.
>>
>>So, what kind of limit does ZFS have when running under 32-bit Solaris?
>>    
>>
>
>It''s 64-bit, as long as your application is "large-file
aware".
>See the largefile(5) and lfcompile(5) man pages for details.
>
>Note: internally, ZFS supports full 64-bit offsets. POSIX, however,
>defines offset_t to be signed, so the actual limit is 63-bit (2^63 - 1).
>
>	$ mkfile -n $(((1 << 63) - 1)) huge
>	$ ls -l huge
>	-rw-------   1 bonwick  staff    9223372036854775807 Mar 16 23:07 huge
>
>Or perhaps more helpfully, using -h:
>
>	$ ls -lh huge
>	-rw-------   1 bonwick  staff       8.0E Mar 16 23:07 huge
>
>Jeff
>
>  
>