[CentOS-virt] I would like to verify what are the available options for RAM storage.

[Eliezer Croitoru]

Hey All,

I am not sure what the status of the current technology in the market 
and was wondering if it would be fine to ask specifically here.

I am using KVM for a time now and it's great but I have couple doubts.
When I am running a test on a specific VM it's mostly on 10k SPINNING 
disks and they seem to survive like forever now(years...). But I need to 
run tests on RAM only.
Until now what I did was to create a tmpfs, shutdown the VM, move the 
disk image to the tmpfs, change the disk location on the VM settings and 
then turn the machine on again when it's on RAM(I cannot 100% control 
swap since it's the kernel doings..).


I am considering what to do next and the options are:
- automate the process of migration from one storage to another
- buy more ram
- buy a very fast SSD?
- a combination of RAM + SSD(SWAP)

But I do not know exactly what to do.
Every choice have it's price and it's unclear to me if OVIRT is the same 
as RHEV an if not then is this function available there?


Eliezer



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Re: [CentOS] C7 + UEFI + GPT + RAID1

[Alessandro Baggi]

Hi there,
after installing C7, on fist boot I get this messages:

failure reading sector 0xfc from 'hd2'
failure reading sector 0xe0 from 'hd2'
failure reading sector 0x0  from 'hd2'

Press any key to continue

Entering in grub menu, and typing ls, I get info for hd0 hd1 but not hd2.
hd2 in my case is dvd-rom. Once disconnected there are no errors.

How I can solve this problem with cd-rom?

THanks in advance




Il 13/03/2016 09:23, Alessandro Baggi ha scritto:

Hi messmer,
seems that anaconda supports partitioned RAID devices. Disk selection
see one mdraid device and permits to create partition on it.

Il 13/03/2016 01:04, Gordon Messmer ha scritto:

On 03/12/2016 08:22 AM, Alessandro Baggi wrote:

From several how-to concerning raid1 installation, I must put each
partition on a different md devices.


Not necessarily.  You could put LVM on top of the RAID device, and
create logical volumes.


I've asked times ago if it's more correct create the md device,
partitioning it and create fs on each partition created on md device:


Partitionable RAID devices are supported by Linux, but not by the
Anaconda installer.  You're better off not using them.


I'm installing C7 1511 on a skylake machine with UEFI and I'm confused.
After googling, for my installation I must create gpt table, 1
partition with fat32 type of 512M, and 2 partition for swap and /
(I've excluded /home), clone gpt partition table on second disk with
sgdisk, create md device for swap and /.


Don't clone the partitions.  If you do that, then you also need to
randomize the UUIDs on the destination drive.  It's probably easier to
just create the partitions on each disk:

parted -s /dev/sda mklabel gpt \
 mkpart primary ext4 1M 200M \
 mkpart primary ext4 200M 1224M \
 mkpart primary ext4 1224M 100%
parted -s /dev/sdb mklabel gpt \
 mkpart primary ext4 1M 200M \
 mkpart primary ext4 200M 1224M \
 mkpart primary ext4 1224M 100%

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Re: [CentOS-es] Samba 4 y centos 6.7

[Ricardo]

no conocía nethserver, voy a echarle un vistazo, gracias!


> El 13 mar 2016, a las 10:19, Oscar Osta Pueyo  
> escribió:
> 
> Hola,
> Si no entendí mal, usas bind, por que no usas el dns incluido en el modo ad
> de samba 4. Te puede evitar problemas.
> 
> Tema zentyal...creo que siendo una lista de CentOS sería mejor recomendar
> http://www.nethserver.org/.
> 
> Saludos,
> El dia 10/03/2016 21:51, "Ricky Gutierrez"  va
> escriure:
> 
>> El día 10 de marzo de 2016, 14:05, Ricardo 
>> escribió:
>>> igual te interesa
>>> 
>>> http://www.zentyal.org/server/
>>> 
>>> hay una edición de pago y otra es de la comunidad.
>> gracias , lo estoy considerando como un plan B , pero quiero encontrar
>> el problema del plan a :)
>> 
>> 
>> --
>> rickygm
>> 
>> http://gnuforever.homelinux.com
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Re: [CentOS] C7 + UEFI + GPT + RAID1

[Alessandro Baggi]

Hi messmer,
seems that anaconda supports partitioned RAID devices. Disk selection 
see one mdraid device and permits to create partition on it.


Il 13/03/2016 01:04, Gordon Messmer ha scritto:

On 03/12/2016 08:22 AM, Alessandro Baggi wrote:

From several how-to concerning raid1 installation, I must put each
partition on a different md devices.


Not necessarily.  You could put LVM on top of the RAID device, and
create logical volumes.


I've asked times ago if it's more correct create the md device,
partitioning it and create fs on each partition created on md device:


Partitionable RAID devices are supported by Linux, but not by the
Anaconda installer.  You're better off not using them.


I'm installing C7 1511 on a skylake machine with UEFI and I'm confused.
After googling, for my installation I must create gpt table, 1
partition with fat32 type of 512M, and 2 partition for swap and /
(I've excluded /home), clone gpt partition table on second disk with
sgdisk, create md device for swap and /.


Don't clone the partitions.  If you do that, then you also need to
randomize the UUIDs on the destination drive.  It's probably easier to
just create the partitions on each disk:

parted -s /dev/sda mklabel gpt \
 mkpart primary ext4 1M 200M \
 mkpart primary ext4 200M 1224M \
 mkpart primary ext4 1224M 100%
parted -s /dev/sdb mklabel gpt \
 mkpart primary ext4 1M 200M \
 mkpart primary ext4 200M 1224M \
 mkpart primary ext4 1224M 100%

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Re: [CentOS] C7 + UEFI + GPT + RAID1

[Chris Murphy]

>
>
> Pretty much the only correct way to do this is with firmware (imsm) or
hardware RAID.

If you have empty drives anaconda can raid1 everything including the EFI
system partitions using mdadm metadata 0.9. But since the firmware doesn't
know this ESP is an array there is a possibility only one ESP gets modified
which is effectively corruption.

What's really needed is a boot services daemon that manages boot and ESP
volumes. Instead of RAID 1, it keeps them synced. And instead of them
always being mounted persistently, they're mounted on demand only when
they're modified, and only modified by API via the daemon. Of course this
doesn't exist yet. But without it, we've regressed in functionality and
reliability.


Chris Murphy
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