Re: Oracle ASM and UDEV

..... advantages , maybe only just standard ASM advantages. But I am just testing different technologies and making documentation. With AWS is easy to build and destroy :) and why not ? in OVM we also use ASM. What dis advantages this can bring with AWS EC2 instance ?

*-----------------*

*Best RegardsStay in touch...*

On 16 February 2015 at 20:31, Niall Litchfield <niall.litchfield_at_gmail.com> wrote:

> Can I ask *why* you need to use ASM with an AWS instance? I'm struggling
> to see what advantage it would give you over and above a filesystem on the
> AWS storage?
>
> On Mon, Feb 16, 2015 at 5:08 PM, Out <mufc01666_at_gmail.com> wrote:
>
>> Thanks everyone for help.
>>
>> I am using EC2 AWS cloud instances with RHEL 7 and they are using XEN
>> visualization. I am not sure if I can change something outside from OS,
>> like I can do for VMware or OVM.
>>
>> I test a bit with disk names and it seems they I always have same names
>> for devises path. So now I removed some options from UDEV conf file and it
>> works.
>>
>> KERNEL=="xvdg", SYMLINK+="oracleasm/asm-data3" OWNER="grid",
>> GROUP="asmadmin", MODE="0660"
>>
>> So I don't have UUID , I don't use UUID.
>> Is it good enough or can be some side effects ?
>>
>> P.S. This is not prod system.
>>
>>
>>
>> *-----------------*
>> *Tiran*
>> *Best Regards*
>> *Stay in touch...*
>> I did a blog entry on this in August. See if this helps. Also if you are
>> using VMware vmdk's I think there is an option to generate SCSI id's.
>>
>> Find the section in the blog that talks about rhel 7 for the rules:
>>
>> https://dbakerber.wordpress.com/2014/08/08/udev-rules/
>>
>> Sent from my iPhone
>>
>> On Feb 16, 2015, at 5:59 AM, Ls Cheng <exriscer_at_gmail.com> wrote:
>>
>> looking the device name it looks like the system is a virtualized guest?
>>
>> AFIAK scsi_id does not return anything for virtual disks
>>
>> In OVM Guests for example, this is from a RAC running in OVM, what we do
>> is in vm.cfg we bind the physical disks to xvd* disk in the guest, for
>> example:
>>
>> disk =
>> ['file:/OVS/Repositories/0004fb00000300008efa6174ff36f936/VirtualDisks/0004fb0000120000788e1d3e6843db80.img,xvda,w',
>> 'phy:/dev/mapper/3600144f0b681e04e0000523abfa90006,xvdb,w!',
>> 'phy:/dev/mapper/3600144f0b681e04e0000523abfbd0007,xvdc,w!',
>> 'phy:/dev/mapper/3600144f0b681e04e0000523abfcb0008,xvdd,w!',
>> 'phy:/dev/mapper/3600144f0b681e04e0000523ac063000a,xvde,w!',
>> 'phy:/dev/mapper/3600144f0b681e04e0000523ac072000b,xvdf,w!',
>> 'phy:/dev/mapper/3600144f0b681e04e0000523ac150000c,xvdg,w!',
>> 'phy:/dev/mapper/3600144f0b681e04e0000523ac160000d,xvdh,w!']
>>
>> and in the guest udev file we have this
>>
>> KERNEL=="xvdb1", NAME="asm_crsdata01p1" OWNER="grid", GROUP="asmadmin",
>> MODE="0660"
>> KERNEL=="xvdc1", NAME="asm_crsdata02p1" OWNER="grid", GROUP="asmadmin",
>> MODE="0660"
>> KERNEL=="xvdd1", NAME="asm_crsdata03p1" OWNER="grid", GROUP="asmadmin",
>> MODE="0660"
>> KERNEL=="xvde1", NAME="asm_dgdata01_01p1" OWNER="grid", GROUP="asmadmin",
>> MODE="0660"
>> KERNEL=="xvdf1", NAME="asm_dgdata01_02p1" OWNER="grid", GROUP="asmadmin",
>> MODE="0660"
>> KERNEL=="xvdg1", NAME="asm_dgfra01_01p1" OWNER="grid", GROUP="asmadmin",
>> MODE="0660"
>> KERNEL=="xvdh1", NAME="asm_dgfra01_02p1" OWNER="grid", GROUP="asmadmin",
>> MODE="0660"
>>
>> in VMWARE yuo can get guest UUID by setting EnableUUID to TRUE but I dont
>> think there is anyway in OVM
>>
>> You need to ask Amazon what sort of Virtualization they are using
>>
>>
>> Thanks
>>
>>
>> On Mon, Feb 16, 2015 at 12:42 PM, Out <mufc01666_at_gmail.com> wrote:
>>
>>> Hi,
>>>
>>> Thanks for reply.
>>>
>>> I tried also what is mentioned on Oracle document which you send me but
>>> result is same again no output.
>>>
>>> /usr/lib/udev/scsi_id --whitelisted --replace-whitespace
>>> --device=/dev/xvdj1
>>>
>>> ------
>>> When I am running blkid I have some output.
>>>
>>> blkid
>>> /dev/xvda2: UUID="668dbd02-c201-44bc-be76-f606fc9ab8db" TYPE="xfs"
>>> PARTUUID="9146b810-9a31-4c10-a206-01b0bbaca807"
>>> /dev/xvda3: UUID="4724e874-741e-49a0-8826-58caca0feae7" TYPE="xfs"
>>> PARTLABEL="primary" PARTUUID="1229ed73-0343-4233-b2d8-6876162af9c6"
>>> /dev/xvdj1: UUID="4b3dd71d-e685-4d1e-9a95-06958dfd4c1f" TYPE="xfs"
>>>
>>> So I guess that the problem is not from Amazon EC2......?
>>>
>>>
>>>
>>> *-----------------*
>>> *Tiran*
>>>
>>> *Best RegardsStay in touch...*
>>>
>>> On 16 February 2015 at 12:11, Mladen Gogala <dmarc-noreply_at_freelists.org
>>> > wrote:
>>>
>>>> You're doing it wrong. Here is the right way for EL7:
>>>> https://docs.oracle.com/cd/E52668_01/E54669/html/ol7-s19-storage.html
>>>>
>>>> On 02/16/2015 05:43 AM, Out wrote:
>>>>
>>>> Dear,
>>>>
>>>> I need to setup ASM. Because I am using RHEL 7 I cannot find
>>>> kmod-asm package in repository. I guess is not yet available for RHEL 7
>>>> unlike for RHEL 6.6......????
>>>>
>>>> So I am trying to set up UDEV for ASM. My problem is when I need to
>>>> get disk id for UDEV rules I get nothing, Command is not returning anything.
>>>>
>>>> /usr/lib/udev/scsi_id -g -u -d /dev/xvdj1
>>>>
>>>>
>>>> My instance is in EC2 in AWS.
>>>>
>>>> Can this be because this is EC2 instance or I am doing something
>>>> wrong.
>>>>
>>>> Please if someone have experience with this help me.
>>>>
>>>> Thanks
>>>>
>>>> *Aleks*
>>>>>
>>>>> *Best Regards Stay in touch...*
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Mladen Gogala
>>>> Oracle DBAhttp://mgogala.freehostia.com
>>>>
>>>>
>>>
>>
>
>
> --
> Niall Litchfield
> Oracle DBA
> http://www.orawin.info
>

--
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