[OpenIndiana-discuss] Are there any issues re ZFS on 2TB disks (from WD??) with large blocksizes?

[Deano]

Because disk labels issues only matter for boot loaders in most
circumstances... 

If we could use EFI everywhere then there is no issue (32bit 2TB EFI is fine
for example), however as you mentioned EFI boot loading is currently patchy
due to BIOS issues.

Which means for all practical consideration, it's the boot loaders that
cause the issues with drive sizes.

Bye,
Deano

-----Original Message-----
From: Martin Bochnig [mailto:martin at martux.org] 
Sent: 07 February 2011 12:44
To: Discussion list for OpenIndiana
Subject: Re: [OpenIndiana-discuss] Are there any issues re ZFS on 2TB disks
(from WD??) with large blocksizes?

On Mon, Feb 7, 2011 at 2:33 PM, Deano <deano at rattie.demon.co.uk> wrote:
> There is no problem in general with 2TB+ data drives under OI, you can get
> some extra speed by using a modified zpool
>
(http://wiki.openindiana.org/oi/SATA+-+Advanced+Format+and+4K+Sector+drives)
> when you create but it works either way.
>
> As mentioned by some other posters, for boot drives you also have an issue
> of boot loaders and 32/64 bit ness.
>
> HTH,
> Deano
> deano at cloudpixies.com



since when is a disk label a boot loader?


here is what i havd written:


Situation:

32bit kernel (VTOC and EFI label [?]): Limit if larger than 1TB (1TB still
ok)

64bit kernel:  if VTOC label: Limit if larger than 2TB (2TB still ok)
                   if EFI label: No reasonable limit.


Drawback: EFI hardly has boot support on most current BIOS based x86
computers.

But for 2TB disks you are still fine: Bootable VTOC labels still support
them.
Beyond that (e.g. upcoming 3TB disks), see above.




%mab

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