PO | 2 Aug 01:45 2007
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raid question

Hi all!

Anyone ever tried to raid two external hard drives through usb or 
firewire? Can it be done?

Any thoughts on this?

Thanks.

po
Evan Hisey | 2 Aug 02:26 2007
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Re: raid question

po-
  It can be done but it is kind of an odd setup. The best one is a
raid 0 configuration.I think anything else is going to get to
complicated.

Evan

On 8/1/07, PO <x75 <at> shaw.ca> wrote:
> Hi all!
>
> Anyone ever tried to raid two external hard drives through usb or
> firewire? Can it be done?
>
> Any thoughts on this?
>
> Thanks.
>
> po
>
>
> _______________________________________________
> slackware mailing list
> slackware <at> mailman.lug.org.uk
> https://mailman.lug.org.uk/mailman/listinfo/slackware
>
Marcel Lauhoff | 2 Aug 10:19 2007
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Re: raid question

Hi

On 8/2/07, PO <x75 <at> shaw.ca> wrote:

> Anyone ever tried to raid two external hard drives through usb or
> firewire? Can it be done?
Of course can it be done. You can use the linux software raid
capabilities on any block device.

I use two external usb disks with both 200G in a raid 1. On top of
that I use LVM and on top of that dm-crypt/luks.

So far I works ok for me. On high io my usb mouse sometimes gets a
little slow, but thats not so bad. Disk speed is about 20M/sec.
PO | 2 Aug 13:53 2007
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Re: raid question

Marcel Lauhoff wrote:
> Hi
>
> On 8/2/07, PO <x75 <at> shaw.ca> wrote:
>
>   
>> Anyone ever tried to raid two external hard drives through usb or
>> firewire? Can it be done?
>>     
> Of course can it be done. You can use the linux software raid
> capabilities on any block device.
>   
It's been a few years since I used the software raid setup, but I 
remember that it works perfectly.
> I use two external usb disks with both 200G in a raid 1. On top of
> that I use LVM and on top of that dm-crypt/luks.
>   
Yes! That's the target setup I was thinking of. Well, more like 2 500 G 
usb2 drives under a raid 0 setup with a form of loopback encryption....
> So far I works ok for me. On high io my usb mouse sometimes gets a
> little slow, but thats not so bad. Disk speed is about 20M/sec.
>   
Thanks so much, this is going to be fun! I'll get on this quick as I can.

po
Andy Smith | 3 Aug 05:22 2007
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Re: raid question

Hi,

On Thu, Aug 02, 2007 at 04:53:57AM -0700, PO wrote:
> Marcel Lauhoff wrote:
> >I use two external usb disks with both 200G in a raid 1. On top of
> >that I use LVM and on top of that dm-crypt/luks.
> >  
> Yes! That's the target setup I was thinking of. Well, more like 2 500 G 
> usb2 drives under a raid 0 setup with a form of loopback encryption....

I wouldn't recommend using RAID-0 unless the data is low value.  Two
disks have twice the failure rate of one disk, and when you lose one
you lose all your data.

> >So far I works ok for me. On high io my usb mouse sometimes gets a
> >little slow, but thats not so bad. Disk speed is about 20M/sec.
> >  
> Thanks so much, this is going to be fun! I'll get on this quick as I can.

Not so relevant for your intended use, but if one is intending to
use a USB hard drive in RAID-1 with an internal hard drive, one can
configure the external drive to be "write mostly" so that all reads
are directed only to the internal, which will free up a bit of USB
bus bandwidth.

The purpose of that option is for things like that where parts of
the mirror may be on disproportionately slow buses, like USB disks
and network block devices.

Cheers,
(Continue reading)

Gwenhwyfaer | 3 Aug 18:18 2007
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Re: raid question

On 03/08/07, Andy Smith <andy <at> lug.org.uk> wrote:

Hi,

On Thu, Aug 02, 2007 at 04:53:57AM -0700, PO wrote:
> Yes! That's the target setup I was thinking of. Well, more like 2 500 G
> usb2 drives under a raid 0 setup with a form of loopback encryption....

I wouldn't recommend using RAID-0 unless the data is low value.  Two
disks have twice the failure rate of one disk, and when you lose one
you lose all your data.

Isn't the picture even worse than that? Sure, two disks have twice the failure rate of one disk when used independently; but in a RAID-0 array, wouldn't they create a cumulative drive whose failure rate is actually the product of its individual drives', rather than the sum? Not to mention that disks from the same batch tend to fail at the same time...

My personal feeling about RAID-0 is that if you've got little enough data that you can easily back it up, or if it changes slowly enough that those backups are always complete, you don't need it anyway.

Regards
Gwenhwyfaer
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markus reichelt | 4 Aug 14:48 2007
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building packages, checkinstall substitute

Hi,

since checkinstall borks on Slackware 12 I'm looking for a decent
substitute. I liked checkinstall's simplicity. 

Which tool can you recommend for building packages (or point to some
good howto, respectively)?

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Willy Sudiarto Raharjo | 4 Aug 14:59 2007
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Re: building packages, checkinstall substitute

> since checkinstall borks on Slackware 12 I'm looking for a decent
> substitute. I liked checkinstall's simplicity.
>
> Which tool can you recommend for building packages (or point to some
> good howto, respectively)?

Slackbuilds?
It's the same method that was being used by Pat itself :D

Check http://slackbuilds.org/ for more repositories

--

-- 
Willy Sudiarto Raharjo
Registered Linux User : 336579
Web : http://www.informatix.or.id/willy
Blog : http://willysr.blogspot.com http://slackblogs.blogspot.com
markus reichelt | 4 Aug 15:21 2007
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Re: building packages, checkinstall substitute

* Willy Sudiarto Raharjo <willysr <at> gmail.com> wrote:

> > since checkinstall borks on Slackware 12 I'm looking for a decent
> > substitute. I liked checkinstall's simplicity.
> >
> > Which tool can you recommend for building packages (or point to some
> > good howto, respectively)?
> 
> Slackbuilds?

No way:

"It will take [...] about fifteen minutes to create each package
(actual compile process not included), but the time you save in the
future (you want to create a newer version of the package) makes the
initial time expenditure worth it."

It simply is overkill for my setup. That's why I mentioned the magic
word "simplicity" ;-)

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markus reichelt | 4 Aug 15:28 2007
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Re: building packages, checkinstall substitute

* markus reichelt <ml <at> mareichelt.de> wrote:

> It simply is overkill for my setup. That's why I mentioned the magic
> word "simplicity" ;-)

I just found out that it's being worked on, finally, and there's a
workaround for checkinstall:

http://checkinstall.izto.org/cklist/msg00319.html

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Gmane