Make ZFS use the physical sector size when computing initial ashift

[Steven Hartland]

Hi DES, unfortunately you need a quite bit more than this to work compatibly.

I've had a patch here that does just this for quite some time but there's been some
discussion on how we want additional control over this so its not been commited.

If others are interested I've attached this as it achieves what we needed here so
may also be of use for others too.

There's also a big discussion on illumos about this very subject ATM so I'm
monitoring that too.

Hopefully there will be a nice conclusion come from that how people want to
proceed and we'll be able to get a change in that works for everyone.

    Regards
    Steve
----- Original Message ----- 
From: "Dag-Erling Smørgrav" <des at des.no>
To: <freebsd-fs at freebsd.org>; <freebsd-hackers at freebsd.org>
Cc: <ivoras at freebsd.org>
Sent: Wednesday, July 10, 2013 10:02 AM
Subject: Make ZFS use the physical sector size when computing initial ashift


The attached patch causes ZFS to base the minimum transfer size for a
new vdev on the GEOM provider's stripesize (physical sector size) rather
than sectorsize (logical sector size), provided that stripesize is a
power of two larger than sectorsize and smaller than or equal to
VDEV_PAD_SIZE.  This should eliminate the need for ivoras@'s gnop trick
when creating ZFS pools on Advanced Format drives.

DES
-- 
Dag-Erling Smørgrav - des at des.no




--------------------------------------------------------------------------------


> _______________________________________________
> freebsd-fs at freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-fs
> To unsubscribe, send any mail to "freebsd-fs-unsubscribe at freebsd.org" 


================================================
This e.mail is private and confidential between Multiplay (UK) Ltd. and the person or entity to whom it is addressed. In the event of misdirection, the recipient is prohibited from using, copying, printing or otherwise disseminating it or any information contained in it. 

In the event of misdirection, illegible or incomplete transmission please telephone +44 845 868 1337
or return the E.mail to postmaster at multiplay.co.uk.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: zzz-zfs-ashift-fix.patch
Type: application/octet-stream
Size: 12272 bytes
Desc: not available
URL: <http://lists.freebsd.org/pipermail/freebsd-fs/attachments/20130710/50b35b68/attachment.obj>