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Exadata is the Ferrari of the technology world. It’s considered the technology for the select few, but everyone dreams about it. There is very little information available on the Internet right now about the architecture and the administration of Exadata, though it’s a huge subject in itself, which demand numerous high quality books, dedicated blogs, websites and special interest groups.

This blog post just mentions some of very important components of Exadata Storage Server, which are physical disks, cell disks, grid disks and ASM disks and their correspondence.

The Exadata Storage Server contains 12 physical disks.

There is one to one relationship between a physical disk and the cell disk. One physical disk corresponds to a single cell disk.

Then a Grid disk comprises of many cell disks.

And a Grid disk corresponds to one ASM disk.

An ASM diskgroup comprises of many ASM disks.

On the Exadata Storage Server, We can use cellcli command line utility in Exadata to see the information about physical disks, cell disks, grid disks and the cell.

The cellcli utility works from the root, celladmin and cellmonitor (read-only) users. The best practice is actually to run it from the last two less-privileged users, and not from the root user.


Now let’s have look at some of the disk management commands using cellcli utility.

1	[root@mycell-net0 ~]# cellcli

2	CellCLI: Release 11.2.1.3.1 - Production on Fri Oct 29 07:47:26 GMT 2010

3

4	Copyright (c) 2007, 2009, Oracle. All rights reserved.

5	Cell Efficiency Ratio: 140

Just to give you an idea about what cellcli has on offer, look at the output of the help command:

01	CellCLI> help

02

03	HELP [topic]

04	Available Topics:

05

ALTER

06	ALTER ALERTHISTORY

07	ALTER CELL

08	ALTER CELLDISK

09	ALTER GRIDDISK

10	ALTER IORMPLAN

11

ALTER LUN

12	ALTER THRESHOLD

13	ASSIGN KEY

14

CALIBRATE

15

CREATE

16	CREATE CELL

17	CREATE CELLDISK

18	CREATE FLASHCACHE

19	CREATE GRIDDISK

20	CREATE KEY

21	CREATE THRESHOLD

22

DESCRIBE

23

DROP

24	DROP ALERTHISTORY

25

DROP CELL

26	DROP CELLDISK

27	DROP FLASHCACHE

28	DROP GRIDDISK

29	DROP THRESHOLD

30	EXPORT CELLDISK

31	IMPORT CELLDISK

32

LIST

33	LIST ACTIVEREQUEST

34	LIST ALERTDEFINITION

35	LIST ALERTHISTORY

36

LIST CELL

37	LIST CELLDISK

38	LIST FLASHCACHE

39	LIST FLASHCACHECONTENT

40	LIST GRIDDISK

41	LIST IORMPLAN

42

LIST KEY

43

LIST LUN

44	LIST METRICCURRENT

45	LIST METRICDEFINITION

46	LIST METRICHISTORY

47	LIST PHYSICALDISK

48	LIST THRESHOLD

49

SET

50

SPOOL

51

START

Let’s see the output of some of the commands listed above:

01	CellCLI> list physicaldisk detail

02

03	name:                   [5:3:2:0]

04	diskType:               FlashDisk

05	id:                     00000200000000000000

06	luns:                   1_2

07	makeModel:              "MARVELL SD88SA02"

08	physicalFirmware:       D20R

09	physicalInsertTime:     2010-10-04T21:05:46+00:00

10	physicalInterface:      sas

11	physicalSerial:         0000000000000000000

12	physicalSize:           22.8880615234375G

13	slotNumber:             "PCI Slot: 1; FDOM: 2"

14	status:                 normal

15

01	CellCLI> list cell detail

02

03	name:                   mycellnet0

04	bmcType:                IPMI

05	cellVersion:            OSS_11.2.0.1.0_LINUX.X64_100818.1

06	cpuCount:               16

07	fanCount:               12/12

08	fanStatus:              normal

09	id:                     0000X00000

10	interconnectCount:      3

11	interconnect1:          bond0

12	iormBoost:              0.0

13	ipaddress1:

14	kernelVersion:          2.6.18-194.3.1.0.2.el5

15	makeModel:              SUN MICROSYSTEMS SUN FIRE X4275 SERVER SAS

16	metricHistoryDays:      7

17	notificationMethod:     snmp

18	notificationPolicy:     critical,warning,clear

19	offloadEfficiency:      47,485.1

20	powerCount:             2/2

21	powerStatus:            normal

22

smtpFrom:

23	smtpFromAddr:

24

smtpPort:

25	smtpServer:

26	smtpToAddr:

27	smtpUseSSL:

28	snmpSubscriber:

29	status:                 online

30	temperatureReading:     27.0

31	temperatureStatus:      normal

32	upTime:                 16 days, 14:01

33	cellsrvStatus:          running

34	msStatus:               running

35	rsStatus:               running

36

01	CellCLI> list celldisk detail

02

03	name:                   FD_15_mycellnet0

04

comment:

05	creationTime:           2010-07-14T02:05:06+00:00

06	deviceName:             /dev/sdy

07	devicePartition:        /dev/sdy

08	diskType:               FlashDisk

09	errorCount:             0

10	freeSpace:              0

11	id:                     00000000-0000-0000-0000-000000000000

12	interleaving:           none

13	lun:                    5_3

14	size:                   22.875G

15	status:                 normal

16

01	CellCLI> list griddisk detail

02

03	name:                   CD_15_mycellnet0

04	availableTo:

05	cellDisk:               CD_15_mycellnet0

06

comment:

07	creationTime:           2010-07-14T02:12:55+00:00

08	diskType:               FlashDisk

09	errorCount:             0

10	id:                     00000000-0000-000-0000-000000000000

11	offset:                 528.734375G

12	size:                   29.125G

13	status:                 active

In the future posts, I will be touching the administration of celldisks, as how to perform operations like (import/export/create/drop/alter) on the celldisks.

The post was originally published by me at Pythian's Blog.