Date: Sat, 6 Mar 2004 23:50:15 -0800 (PST) From: Dmitry Morozovsky <marck@rinet.ru> To: freebsd-bugs@FreeBSD.org Subject: Re: kern/63839: [patch] vinum fake-disklabel block/frag fix Message-ID: <200403070750.i277oFku007011@freefall.freebsd.org>
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The following reply was made to PR kern/63839; it has been noted by GNATS.
From: Dmitry Morozovsky <marck@rinet.ru>
To: "Greg 'groggy' Lehey" <grog@FreeBSD.org>
Cc: FreeBSD-gnats-submit@FreeBSD.org
Subject: Re: kern/63839: [patch] vinum fake-disklabel block/frag fix
Date: Sun, 7 Mar 2004 10:41:36 +0300 (MSK)
On Sun, 7 Mar 2004, Greg 'groggy' Lehey wrote:
GgL> > This patch changes vinum fake-disklabel block/frag size from default 8k/1k to
GgL> > more approppriate for modern disks 16k/2k. Also, it removes duplicate
GgL> > assignment. It applies to both -current and -stable.
GgL>
GgL> Why do you want to do this? When do you ever use the "label"? I'd
GgL> much rather see the label go away. It's not needed for anything that
GgL> I know about.
Not exactly ;-) Yes, AFAIK it is not needed in -current, but it simplify
newfs'ing Vinum volume under -stable, where newfs uses fake disklabel info to
determine default frag/block size.
Before this patch news with default parameters would use
root@whale:/# newfs -N -v /dev/vinum/obj
Warning: Block size and bytes per inode restrict cylinders per group to 22.
Warning: 1536 sector(s) in last cylinder unallocated
/dev/vinum/obj: 25164288 sectors in 6144 cylinders of 1 tracks, 4096 sectors
12287.2MB in 280 cyl groups (22 c/g, 44.00MB/g, 10944 i/g)
super-block backups (for fsck -b #) at:
32, 90144, 180256, 270368, 360480, 450592, 540704, 630816, 720928, 811040,
[...]
So you should explicitely use -f/-b for setting 2k/16k.
After patch, you will automagically get more appropriate for multi-gigabyte
partition blocksizes:
root@whale:/# newfs -N -v /dev/vinum/obj
Warning: Block size and bytes per inode restrict cylinders per group to 89.
Warning: 1536 sector(s) in last cylinder unallocated
/dev/vinum/obj: 25164288 sectors in 6144 cylinders of 1 tracks, 4096 sectors
12287.2MB in 70 cyl groups (89 c/g, 178.00MB/g, 22144 i/g)
super-block backups (for fsck -b #) at:
32, 364576, 729120, 1093664, 1458208, 1822752, 2187296, 2551840, 2916384,
[...]
Sincerely,
D.Marck [DM5020, MCK-RIPE, DM3-RIPN]
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*** Dmitry Morozovsky --- D.Marck --- Wild Woozle --- marck@rinet.ru ***
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