openSUSE 13.2: md - Need advice which raid1 super format (1.0/1.2) is preferred

openSUSE 13.2: md - Need advice which raid1 super format (1.0/1.2) is preferred

[Dieter Nützel]

Hello List,

I need advice from the 'gurus' which raid1 md super format (1.0 or 1.2) 
is preferred for SSD/'old' SATA disks.

Currently I have this on my gfx devel machine (Xeon X3430):

cat /⁠proc/⁠mdstat
Personalities : [raid1]
md2 : active raid1 sdc1[0] sdd1[1]
       156288896 blocks super 1.0 [2/⁠2] [UU]
       bitmap: 0/⁠2 pages [0KB], 65536KB chunk

md1 : active raid1 sdb2[1] sda2[0]
       60391744 blocks super 1.2 [2/⁠2] [UU]

md0 : active raid1 sdb1[1] sda1[0]
       2095104 blocks super 1.2 [2/⁠2] [UU]

unused devices: <none>

md0 and md1
are on my SSD's which I've created by 'hand' (with mdadm) under openSUSE 
13.2.

md2
is on my SATAs which I've created 'automatically' under yast2.

My question to you is:
Looks this sane (chunk only for super 1.0 on real SATAs and super 1.2 on 
SSDs) or should I change anything, here.

I'll nuke md0 (swap) and merge it with md1 (root) 'cause I've upgraded 
my RAM from 4 GB to 16 GB (soon to 24/32 GB max) and do not need swap 
anylonger.

Any hints?

-⁠Dieter
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Re: openSUSE 13.2: md - Need advice which raid1 super format (1.0/1.2) is preferred

[NeilBrown]

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On Wed, 01 Apr 2015 01:55:18 +0200 Dieter Nützel <Dieter@nuetzel-hh.de> wrote:

> Hello List,
> 
> I need advice from the 'gurus' which raid1 md super format (1.0 or 1.2) 
> is preferred for SSD/'old' SATA disks.

It depends on what you want.

If you want the filesystem in the partition to be visible without configuring
RAID, then 1.0.
If you explicitly don't.  i.e. you don't see the filesystem until you
assemble the raid1, then 1.2.

Personally, I prefer 1.2, but your needs might be different.

If you boot off the raid1 array, then your boot loader might have a
preference.

NeilBrown


> 
> Currently I have this on my gfx devel machine (Xeon X3430):
> 
> cat /⁠proc/⁠mdstat
> Personalities : [raid1]
> md2 : active raid1 sdc1[0] sdd1[1]
>        156288896 blocks super 1.0 [2/⁠2] [UU]
>        bitmap: 0/⁠2 pages [0KB], 65536KB chunk
> 
> md1 : active raid1 sdb2[1] sda2[0]
>        60391744 blocks super 1.2 [2/⁠2] [UU]
> 
> md0 : active raid1 sdb1[1] sda1[0]
>        2095104 blocks super 1.2 [2/⁠2] [UU]
> 
> unused devices: <none>
> 
> md0 and md1
> are on my SSD's which I've created by 'hand' (with mdadm) under openSUSE 
> 13.2.
> 
> md2
> is on my SATAs which I've created 'automatically' under yast2.
> 
> My question to you is:
> Looks this sane (chunk only for super 1.0 on real SATAs and super 1.2 on 
> SSDs) or should I change anything, here.
> 
> I'll nuke md0 (swap) and merge it with md1 (root) 'cause I've upgraded 
> my RAM from 4 GB to 16 GB (soon to 24/32 GB max) and do not need swap 
> anylonger.
> 
> Any hints?
> 
> -⁠Dieter
> --
> To unsubscribe from this list: send the line "unsubscribe linux-raid" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at  http://vger.kernel.org/majordomo-info.html


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