Difference: TiersAtRAL (1 vs. 5)

Revision 52009-10-30 - AlastairDewhurst

 
META TOPICPARENT name="WebHome"

Introduction

This page briefly explains what the ATLAS computing model is, what facilities are avaliable at RAL and how ATLAS users can access them.

The ATLAS computing Model

The RAW data is produced by ATLAS at CERN, this is referred to as the Tier 0. The data is archived at CERN before being distributed to the Tier 1s. There are 10 Tier 1s serving ATLAS. RAL is the UK Tier 1 and is expected to recieve 10% of the raw data from CERN. Each Tier 1 has several Tier 2 sites asscoiated with it. The job of the Tier 1 is to re-process and distribute the data around the Tier 2s. The job of the Tier 2s is to run user analysis on the data. Finally there are so called Tier 3 sites. These sites do not hold any official copies of ATLAS data but individuals can copy data to them in order to run their own analysis.

Tier 1

Changed:
<
<		 The Tier 1 for the UK cloud is based at RAL. The Tier 1 is in the machine room in building R89. In order to run at the Tier 1 your grid certificate must be either: /atlas/uk/Role=production /atlas/uk/Role=poweruser0 The avaliable space tokens are
>
>		 The Tier 1 for the UK cloud is based at RAL. The Tier 1 is in the machine room in building R89. In order to run at the Tier 1 your grid certificate must be either: /atlas/uk/Role=production /atlas/uk/Role=poweruser0 The avaliable space tokens are
 
Space Token Permission Notes
RAL-LCG2_MCDISK default  
RAL-LCG2_DATADISK default  
RAL-LCG2_HOTDISK default Used to store an extra copy of "hot" data
RAL-LCG2_SCRATCHDISK default + poweruser0 get write permission Deleted after 28 days
RAL-LCG2_MCTAPE default Disk buffer for the MC tape
RAL-LCG2_DATATAPE default Disk buffer for the Data tape
Changed:
<
<		The default permissions is read and write for production and read permission for poweruser0. The group disks that were avaliable at the Tier 1 are being removed in favour of the scratch disk.
>
>		The default permissions is read and write for production and read permission for poweruser0. The group disks that were avaliable at the Tier 1 are being removed in favour of the scratch disk.
  The full list of the space tokens available on the grid can be found at Tiers of ATLAS

Tier 2

As well as the Tier 1 there is a Tier 2 cluster also based at RAL however it is in a different building from the Tier 1 and run by different people.

Space Token Permission Notes
RALPP_MCDISK default  
RALPP_DATADISK default  
RALPP_HOTDISK default Used to store an extra copy of "hot" data
RALPP_PRODDISK default  
RALPP_SCRATCHDISK default + everyone get write permission Deleted after 28 days
RALPP_SOFT-TEST default + soft-test users get write and delete permission  
RALPP_LOCALGROUPDISK default + UK users get write permission  

The default permissions is read and write for production and read permission for poweruser0 and normal users.

Local Cluster / Tier 3

The Tier 3 is actually part of the Tier 2 that has been reserved for use by RAL staff.

Disk
<-- -->
Sorted descending 		Size Backed Up Usage
/opt/ppd/scratch 1.6 TB No Data - An email will be sent reminding you to delete files
/opt/ppd/month 1.6 TB No Data - An email will be sent reminding you to delete files
/opt/ppd/atlas 128 GB Mirrored every 12 hours ATLAS group usage
$HOME 1 GB* Yes Personal files

*The initial allowance is 2MB but this is a soft cap and will be removed if you send an email to Chris Brew.

As well as access to local disk space RAL users will also have access to the space tokens avaliable on the Tier 2.

Added:
>
>		 Information on how you can access the grid storage element can be found here
  -- AlastairDewhurst - 2009-10-09

Revision 42009-10-28 - AlastairDewhurst

 
META TOPICPARENT name="WebHome"

Introduction

This page briefly explains what the ATLAS computing model is, what facilities are avaliable at RAL and how ATLAS users can access them.

The ATLAS computing Model

Changed:
<
<		Tier 0 This is CERN where the raw data will be produced. This is archived at CERN before being distributed to the Tier 1s.
>
>		The RAW data is produced by ATLAS at CERN, this is referred to as the Tier 0. The data is archived at CERN before being distributed to the Tier 1s. There are 10 Tier 1s serving ATLAS. RAL is the UK Tier 1 and is expected to recieve 10% of the raw data from CERN. Each Tier 1 has several Tier 2 sites asscoiated with it. The job of the Tier 1 is to re-process and distribute the data around the Tier 2s. The job of the Tier 2s is to run user analysis on the data. Finally there are so called Tier 3 sites. These sites do not hold any official copies of ATLAS data but individuals can copy data to them in order to run their own analysis.
 
Changed:
<
<		Tier 1 There are 10 Tier 1s serving ATLAS. RAL is the UK Tier 1 and is expected to recieve 10% of the raw data from CERN. Tier 1
>
>

Tier 1

Added:
>
>		 The Tier 1 for the UK cloud is based at RAL. The Tier 1 is in the machine room in building R89. In order to run at the Tier 1 your grid certificate must be either: /atlas/uk/Role=production /atlas/uk/Role=poweruser0 The avaliable space tokens are
 
Changed:
<
<		Tier 2
>
>
Space Token Permission Notes
Added:
>
>
RAL-LCG2_MCDISK default  
RAL-LCG2_DATADISK default  
RAL-LCG2_HOTDISK default Used to store an extra copy of "hot" data
RAL-LCG2_SCRATCHDISK default + poweruser0 get write permission Deleted after 28 days
RAL-LCG2_MCTAPE default Disk buffer for the MC tape
RAL-LCG2_DATATAPE default Disk buffer for the Data tape
 
Changed:
<
<		Tier 3
>
>		The default permissions is read and write for production and read permission for poweruser0. The group disks that were avaliable at the Tier 1 are being removed in favour of the scratch disk.
 
Changed:
<
<		This page explains the computing model and the hardware that is avaliable at RAL.
>
>		The full list of the space tokens available on the grid can be found at Tiers of ATLAS
 
Deleted:
<
<

Tier 1

The Tier 1 for the UK cloud is based at RAL. The Tier 1 is in the machine room in building R89.

In order to run at the Tier 1 you grid certificate must be either: /atlas/uk/Role=production /atlas/uk/Role=poweruser0

 

Tier 2

As well as the Tier 1 there is a Tier 2 cluster also based at RAL however it is in a different building from the Tier 1 and run by different people.
Deleted:
<
<		A List of the space tokens that can be found in the Tiers of ATLAS
 
Space Token Permission Notes
Deleted:
<
<
RALPP_DATADISK default  
RALPP_HOTDISK default Used to store an extra copy of "hot" data
 
RALPP_MCDISK default  
Added:
>
>
RALPP_DATADISK default  
RALPP_HOTDISK default Used to store an extra copy of "hot" data
 
RALPP_PRODDISK default  
RALPP_SCRATCHDISK default + everyone get write permission Deleted after 28 days
RALPP_SOFT-TEST default + soft-test users get write and delete permission  
RALPP_LOCALGROUPDISK default + UK users get write permission  
Changed:
<
<		default = '/atlas/Role=NULL': 'r---', '/atlas/Role=production' : 'rwpuda'
>
>		The default permissions is read and write for production and read permission for poweruser0 and normal users.
 

Local Cluster / Tier 3

The Tier 3 is actually part of the Tier 2 that has been reserved for use by RAL staff.

Disk Size Backed Up Usage
$HOME 1 GB* Yes Personal files
Changed:
<
<
/opt/ppd/atlas 128 GB Mirrored ever 12 hours ATLAS group usage
>
>
/opt/ppd/atlas 128 GB Mirrored every 12 hours ATLAS group usage
 
/opt/ppd/scratch 1.6 TB No Data - An email will be sent reminding you to delete files
/opt/ppd/month 1.6 TB No Data - An email will be sent reminding you to delete files

*The initial allowance is 2MB but this is a soft cap and will be removed if you send an email to Chris Brew.

As well as access to local disk space RAL users will also have access to the space tokens avaliable on the Tier 2.

-- AlastairDewhurst - 2009-10-09

Revision 32009-10-16 - AlastairDewhurst

 
META TOPICPARENT name="WebHome"

Introduction

This page briefly explains what the ATLAS computing model is, what facilities are avaliable at RAL and how ATLAS users can access them.

The ATLAS computing Model

Tier 0 This is CERN where the raw data will be produced. This is archived at CERN before being distributed to the Tier 1s.

Changed:
<
<		Tier 1 There are 10 Tier 1s serving ATLAS. RAL is the UK Tier 1 and is expected to recieve 10% of the raw data from CERN. Tier 1
>
>		Tier 1 There are 10 Tier 1s serving ATLAS. RAL is the UK Tier 1 and is expected to recieve 10% of the raw data from CERN. Tier 1
 
Changed:
<
<		Tier 2
>
>		Tier 2
  Tier 3

This page explains the computing model and the hardware that is avaliable at RAL.

Tier 1

The Tier 1 for the UK cloud is based at RAL. The Tier 1 is in the machine room in building R89.
Changed:
<
<		In order to run at the Tier 1 you grid certificate must be either:
>
>		In order to run at the Tier 1 you grid certificate must be either: /atlas/uk/Role=production /atlas/uk/Role=poweruser0
Deleted:
<
<		/atlas/uk/Role=production /atlas/uk/Role=poweruser0
 

Tier 2

As well as the Tier 1 there is a Tier 2 cluster also based at RAL however it is in a different building from the Tier 1 and run by different people.
Changed:
<
<

Tier 3

The Tier 3 is actually part of the Tier 2 that has been reserved for use by RAL staff.
>
>		A List of the space tokens that can be found in the Tiers of ATLAS
Space Token Permission Notes
Added:
>
>
RALPP_DATADISK default  
RALPP_HOTDISK default Used to store an extra copy of "hot" data
RALPP_MCDISK default  
RALPP_PRODDISK default  
RALPP_SCRATCHDISK default + everyone get write permission Deleted after 28 days
RALPP_SOFT-TEST default + soft-test users get write and delete permission  
RALPP_LOCALGROUPDISK default + UK users get write permission  

default = '/atlas/Role=NULL': 'r---', '/atlas/Role=production' : 'rwpuda'

Local Cluster / Tier 3

The Tier 3 is actually part of the Tier 2 that has been reserved for use by RAL staff.

Disk Size Backed Up Usage
$HOME 1 GB* Yes Personal files
/opt/ppd/atlas 128 GB Mirrored ever 12 hours ATLAS group usage
/opt/ppd/scratch 1.6 TB No Data - An email will be sent reminding you to delete files
/opt/ppd/month 1.6 TB No Data - An email will be sent reminding you to delete files

*The initial allowance is 2MB but this is a soft cap and will be removed if you send an email to Chris Brew.

As well as access to local disk space RAL users will also have access to the space tokens avaliable on the Tier 2.

  -- AlastairDewhurst - 2009-10-09

Revision 22009-10-09 - AlastairDewhurst

 
META TOPICPARENT name="WebHome"

Introduction

Changed:
<
<		This page briefly explains what the ATLAS computing model is, what facilities are avaliable at RAL and how ATLAS users can access them.
>
>		 This page briefly explains what the ATLAS computing model is, what facilities are avaliable at RAL and how ATLAS users can access them.
 

The ATLAS computing Model

Added:
>
>		Tier 0 This is CERN where the raw data will be produced. This is archived at CERN before being distributed to the Tier 1s.
 
Changed:
<
<		Tier 0 This is CERN where the raw data will be produced. This is archived at CERN before being distributed to the Tier 1s.
>
>		Tier 1 There are 10 Tier 1s serving ATLAS. RAL is the UK Tier 1 and is expected to recieve 10% of the raw data from CERN. Tier 1
 
Changed:
<
<		Tier 1 There are around 10 Tier 1s serving ATLAS.
>
>		Tier 2
 
Deleted:
<
<		Tier 2
 Tier 3

This page explains the computing model and the hardware that is avaliable at RAL.

Tier 1

Changed:
<
<		The Tier 1 for the UK cloud is based at RAL. The Tier 1 is in the machine room in building R89.
>
>		 The Tier 1 for the UK cloud is based at RAL. The Tier 1 is in the machine room in building R89.
 
Changed:
<
<

Tier 2/3

As well as the Tier 1 there is a Tier 2 cluster also based at RAL however it is in a different building from the Tier 1 and run by different people.
>
>		In order to run at the Tier 1 you grid certificate must be either: /atlas/uk/Role=production
Added:
>
>		/atlas/uk/Role=poweruser0

Tier 2

As well as the Tier 1 there is a Tier 2 cluster also based at RAL however it is in a different building from the Tier 1 and run by different people.

Tier 3

The Tier 3 is actually part of the Tier 2 that has been reserved for use by RAL staff.
  -- AlastairDewhurst - 2009-10-09

Revision 12009-10-09 - AlastairDewhurst

 
META TOPICPARENT name="WebHome"

Introduction

This page briefly explains what the ATLAS computing model is, what facilities are avaliable at RAL and how ATLAS users can access them.

The ATLAS computing Model

Tier 0 This is CERN where the raw data will be produced. This is archived at CERN before being distributed to the Tier 1s.

Tier 1 There are around 10 Tier 1s serving ATLAS.

Tier 2

Tier 3

This page explains the computing model and the hardware that is avaliable at RAL.

Tier 1

The Tier 1 for the UK cloud is based at RAL. The Tier 1 is in the machine room in building R89.

Tier 2/3

As well as the Tier 1 there is a Tier 2 cluster also based at RAL however it is in a different building from the Tier 1 and run by different people.

-- AlastairDewhurst - 2009-10-09

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