Date: Fri, 2 Sep 2011 11:07:36 -0400 From: Trent Nelson <trent@snakebite.org> To: <freebsd-fs@freebsd.org> Subject: Re: gptzfsboot and 4k sector raidz Message-ID: <4E60F138.1000705@snakebite.org> In-Reply-To: <553883C7-B97D-429F-AF4A-E208B6051B62@3geeks.org> References: <F335600A-0364-455F-A276-43E23B0E597E@3geeks.org> <4E5F811A.2040307@snakebite.org> <7FAD4A4D-2465-4A80-A445-1D34424F8BB6@3geeks.org> <4E5FBE3E.7020706@snakebite.org> <553883C7-B97D-429F-AF4A-E208B6051B62@3geeks.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 01-Sep-11 1:46 PM, Daniel Mayfield wrote:
>> Enough about sizes; what's your read/write performance like between
>> 512-byte/4K? I didn't think to test performance in the 4K
>> configuration; I really wish I had, now.
>
> I didn't test performance. I'm doing all the work running from the
> mfsBSD boot disc. I'm not sure a simple 'dd' is a good test, but if
> you have suggestions, I'm open.
It's a good test when it shows you can't get more than 20-30MB/sec in
bursts for each disk ;-) I didn't think to try just dd'ing directly to
the disk versus through a zfs pool; I think the results of that would be
pretty conclusive with regards to whether or not using the new 4K-sector
drives with 512-byte sectors is as bad as I'm seeing, or if it's
something else.
Trent.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?4E60F138.1000705>