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6DAF-6B80-4ADE-A66D-7AC352F6A175 at yberwaffe.com>
From: Jeremy Chadwick <jdc at parodius.com>
Subject: Re: OT - was Hammer or ZFS based backup, encryption
Date: Mon, 23 Feb 2009 08:44:44 -0800
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On Mon, Feb 23, 2009 at 05:19:14PM +0100, Jasse Jansson wrote:
> On Feb 23, 2009, at 11:54 AM, Bill Hacker wrote:
>> Robert Luciani wrote:
>>> Freddie Cash wrote:
>>>> Booting FreeBSD 7.1 into a full KDE 4.2
>>>> desktop takes less than 5 minutes.  This is using 3x 120 GB SATA
>>>> drives in a single raidz1.
>>> Wow 5 minutes?!
>>> I don't think I'd be pushing it if I said that seems really slow. :S
>>> On such a fast machine I'd be irritated if it took over a minute to 
>>> boot. On my
>>> 3Ghz Athlon X2 w/ 2Gb RAM, DragonFly boots vkernels, hosting  
>>> services, and Gnome
>>> in about a minute with my two 500Gb hammer drives.
>>
>> One minute 45 seconds into Xfce4 for a VIA C7 @ 1.5 GHz, 2 GB DDR-533, 
>> all-hammerfs on 2 natacontrol RAID1 'antique' 60 GB PATA UDMA 100 HDD.
>>
>> One minute 4 seconds into Xfce4 for an Intel T2130 @ 1.86 GHz 2 GB ? 
>> RAM, 1 X 120 GB 2.5" HDD, DFLY on 33 GB ad0s1, UFS2 with one hammer  
>> partition.
>>
>> RIADz looks to be the wall-time hog....
>
> RAIDZ is known to be slow, even the main developers admit it if you  
> force them to it.

I'd recommend the individual seeing ~5 minute boot times try disabling
ZFS prefetching.  Place vfs.zfs.prefetch_disable="1" in
/boot/loader.conf and reboot the machine.

-- 
| Jeremy Chadwick                                jdc at parodius.com |
| Parodius Networking                       http://www.parodius.com/ |
| UNIX Systems Administrator                  Mountain View, CA, USA |
| Making life hard for others since 1977.              PGP: 4BD6C0CB |