[lug] LUG Digest, Vol 155, Issue 8

[Will]

Do you have a definitive source on this?  The only sources I've seen making
these claims didn't seem all to familiar with LVMs capabilities.

On Thu, Sep 29, 2016 at 3:59 PM, Andrew Gilmore <agilmore2 at gmail.com> wrote:

>
> From: Stephen Kraus <ub3ratl4sf00 at gmail.com>
>> To: "Boulder (Colorado) Linux Users Group -- General Mailing List" <
>> lug at lug.boulder.co.us>
>> Cc:
>> Date: Sat, 24 Sep 2016 15:21:25 -0400
>> Subject: Re: [lug] RAID1 Versus Mirrored LVM (Fedora 23)
>>
>> I like RAID, but I also have a ZFS array. ZFS is generally faster, but
>> its more dependant on you to ensure the viability of the array info and
>> health.
>>
>> On Sep 24, 2016 11:09 AM, <stimits at comcast.net> wrote:
>>
>>> Hi,
>>>
>>> It's becoming more obvious that I need to dig into details of LVM and
>>> RAID. I had originally started out with the intent to produce a mirrored
>>> RAID1 on two new disks, and then use that with LVM to divide up the content
>>> between "/home" and "/var/www". None of those mount points require booting
>>> to them, so this partially simplifies things.
>>>
>>> Until recently I wasn't even aware that LVM itself can have physical
>>> volumes combined into mirrored logical volumes in the same way as RAID1
>>> does. So now I'm wondering if it would be wise to remove the RAID1+LVM
>>> design and instead just use LVM with mirroring of two ordinary disk drives.
>>> Is there anything special about reliability or performance...or anything
>>> else...which would influence the choice of RAID1+LVM versus
>>> LVM-with-mirroring? Why would I pick one scheme over the other?
>>>
>>> Thanks!
>>>
>>
>
> After working through a few of these options, you should know that LVM
> mirroring only uses the second mirror for reading if the first fails.
> If you want RAID 1 read performance, don't use an LVM mirror.
>
> Andrew
>
>
>
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