LVM question

[William A. Mahaffey III]

I have a newly commissioned NetBSD 6.1.5 server up & running AOK. It was
built w/ the idea of adding some more storage after it was online for
additional backup space on my LAN. The case is a mini-tower with 2
unused 5.25" Bays, which can accomodate 8-12 2.5" HDD's using readily
available accessories. I was originally planning to use a RAID10 of
these drives for that additional storage. However, perusal of the web &
man pages reveals that both ZFS & LVM2 are available for use. These are
more storage efficient than a RAID10, with slightly less tolerance of
plural HDD failures in the storage pool. Since I have had exemplary luck
w/ 2.5" HDD's for several years now, I am willing to tolerate the risk
for the additional usable space of either a ZFS or LVM storage setup. My
question is: How reliable/mature are these under NetBSD ? LVM is
obviously widely used by RHEL for years now, & believed to be
mature/reliable enough for large enterprise settings. Is the LVM coding
under NetBSD substantially identical to that under RHEL, absent
necessary changes for porting ? Can anyone vouch for its reliability or
lack thereof ? ZFS is pretty mature under FreeBSD, although the version
under NetBSD seems to be a bit older according to Wikipedia (not a
source I trust implicitly, but all I have for now). Has anyone onlist
used ZFS under NetBSD 6.1.5 for mission-critical storage/backup ? Like
it ? Hate it ? The online ZFS docs are somewhat ominous sounding, but
undated, is development on both LVM2 & ZFS active & ongoing for NetBSD
6.1.5 or higher ? Thanks for any info & have a nice weekend.


--

William A. Mahaffey III

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ever devised by man."
-- Gen. George S. Patton Jr.


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[Michael van Elst]

w...@hiwaay.net ("William A. Mahaffey III") writes:

>these drives for that additional storage. However, perusal of the web &
>man pages reveals that both ZFS & LVM2 are available for use. These are
>more storage efficient than a RAID10, with slightly less tolerance of
>plural HDD failures in the storage pool.

LVM on Linux supports mirroring, so that's comparable to RAID10.

LVM on NetBSD doesn't support redundancy yet. If you want that you
can configure LVM on top of raidframe.


--
--
Michael van Elst
Internet: mle...@serpens.de
"A potential Snark may lurk in every tree."

[William A. Mahaffey III]

On 07/26/15 09:04, Michael van Elst wrote:
> w...@hiwaay.net ("William A. Mahaffey III") writes:
>
>> these drives for that additional storage. However, perusal of the web &
>> man pages reveals that both ZFS & LVM2 are available for use. These are
>> more storage efficient than a RAID10, with slightly less tolerance of
>> plural HDD failures in the storage pool.
> LVM on Linux supports mirroring, so that's comparable to RAID10.
>
> LVM on NetBSD doesn't support redundancy yet. If you want that you
> can configure LVM on top of raidframe.
>
>

Hmmmm .... OK, I am just beginning to look into this, & I missed that
(rather important) detail. I don't think LVM over raidframe buys me
anything new .... Thanks :-).

--

William A. Mahaffey III

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

"The M1 Garand is without doubt the finest implement of war
ever devised by man."
-- Gen. George S. Patton Jr.

[Michael van Elst]

w...@hiwaay.net ("William A. Mahaffey III") writes:

>Hmmmm .... OK, I am just beginning to look into this, & I missed that
>(rather important) detail. I don't think LVM over raidframe buys me
>anything new .... Thanks :-).

LVM is for flexibility, moving things around or creating temporary volumes
can be very useful. Would be even better if we had a filesystem that
could be resized online.

--
--
Michael van Elst
Internet: mle...@serpens.de
"A potential Snark may lurk in every tree."