Date: Wed, 24 Dec 2008 14:08:20 +0100 From: "Dimitri Aivaliotis" <aglarond@gmail.com> To: rick-freebsd2008@kiwi-computer.com Cc: freebsd-geom@freebsd.org Subject: Re: gvinum raid10 stale Message-ID: <55c107bf0812240508v68d9ccf2n164c78891724b634@mail.gmail.com> In-Reply-To: <20081222200312.GA16003@keira.kiwi-computer.com> References: <55c107bf0812180320x502847efi53df5a7da68b73e1@mail.gmail.com> <20081218175752.GA10326@carrot.lan> <20081218182352.GA69287@keira.kiwi-computer.com> <55c107bf0812190250x434e468cy2fb19956f36b5958@mail.gmail.com> <20081219161602.GA80859@keira.kiwi-computer.com> <55c107bf0812220820k2fb99ccev77d661629efed219@mail.gmail.com> <20081222200312.GA16003@keira.kiwi-computer.com>
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Hi Rick,
On Mon, Dec 22, 2008 at 9:03 PM, Rick C. Petty
<rick-freebsd2008@kiwi-computer.com> wrote:
> On Mon, Dec 22, 2008 at 05:20:36PM +0100, Dimitri Aivaliotis wrote:
>>
>
> This is a mirror of stripes, but I'm not really sure what you gain by
> staggering across all the drives like that. Are you doing this for some
> performance gain? If you're really using five disks, you may wish to
> consider raid5. Otherwise, this looks like a mirror of stripes across five
> disks. Much prettier than what you posted originally.
OK, so this IS expandable. That's good news.
My real-life situation is going from 2 to 4 disks, so RAID5 is not an
option here.
> Are you trying to add mirrors or did you want to increase your volume size?
I want to increase volume size.
> You could increase the volume size, but the underlying filesystem would
> need to be resized. I'm not sure if gvinum lets you increase the volume
> size. If you just want to add another striped mirror:
>
> plex org striped 512k volume raid10
> sd length 102480k drive f
> sd length 102480k drive g
> sd length 102480k drive h
> sd length 102480k drive i
> sd length 102480k drive j
Ok, so this would just increase resiliency, without increasing volume size?
Unfortunately so:
(I had to change the plex line because it gave an error: invalid plex
definition ' plex org striped 512k volume raid10')
plex name raid10.p2 org striped 512k vol raid10
<subdisks>
plex name raid10.p3 org striped 512k vol raid10
<subdisks>
# gvinum lp -v
4 plexes:
Plex raid10.p3: Size: 146767085568 bytes (139968 MB)
Subdisks: 32
State: down
Organization: striped Stripe size: 512 kB
Part of volume raid10
Plex raid10.p2: Size: 146767085568 bytes (139968 MB)
Subdisks: 32
State: down
Organization: striped Stripe size: 512 kB
Part of volume raid10
Plex raid10.p0: Size: 146767085568 bytes (139968 MB)
Subdisks: 32
State: down
Organization: striped Stripe size: 512 kB
Part of volume raid10
Plex raid10.p1: Size: 146767085568 bytes (139968 MB)
Subdisks: 32
State: up
Organization: striped Stripe size: 512 kB
Part of volume raid10
But this is not what I'm looking to do, as I'd like to increase volume size.
>> Thanks for your patience with me here. I'm trying to understand how
>> this should work.
>
> No problem. I would still recommend getting rid of the stripes to reduce
> your complexity and simplify future additions, but that's my personal
> preference.
I agree. If I'm going to be reconfiguring the disks anyways, how can
I setup a configuration where I can grow a volume that starts out as a
2-disk mirror? I've tried a few different configurations on a test
server now, but nothing seems to allow me to access the files on the
current volume in its expanded state.
- Dimitri
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