Tuesday, 21 February 2012

NCIE Revision notes


NCIE Revision notes



ISCSI



ISCSI security show – will show the current chap security settings



Igroups are mapped to portsets



Iscsi security show command shows current chap settings



Command to show iscsi digests enabled (iscsi session show –v)



To support an iscsi multipath config you need to have 2 vmkernels



Vlans are recommended for iscsi and nfs and cifs traffic



Command to check if interface is enabled for iscsi – iscsi interface show



Iscsi interface show shows interfaces enabled for iscsi





Switch/Ethernet



E_Port = Inter Switch link



L_Port is a fc hub to a fc switch



Cisco



Show version – tells you the firmware version on cisco switch



Show zoneset – will show the zone config information



The Web Tools GUI is used to manage CISCO MDS servers



Show zone active will show the active zone on a cisco switch



Showversion on a ciso switch will tell you firmware versions and other information



Cisco switch – show firmware (Shows the firmware of a cisco switch)



Show cisco switch zone config (show zoneset)



Brocade



Fabricshow on a brocade fc switch will show you what devices are connected to the fabric



Web tools manages brocade switches



Supportshow will show diags on a brocade switch



Brocade fabricshow



Brocade supportshow



Zoning



Netapp recommends wwpn zoning



FC



Single_image clusters are only supported with Ontap 7.1 and up.



An FCP license is needed for Snapdrive



Hard Zoning is done at the ASIC level



Cfgshow displays the config on a cisco switch

Fcp stat –I 5



Having a single_image cfmode will increase the amount paths to a lun and will also change the wwpn on a host (As they share a wwpn)



HBYAnywhere is used to find information about emulux HBA’s



Standby mode is only supported by windows and solaris hosts



Highly available fc switch config (2 fc switches minimum)



Highly available switch config (2 hba’s minimum)



Fcp connectivity diagram port targets in it, targets, fc switch ports, wwn’s, hosts wwn’s



Advantage of software zoning is that you can plug a cable anywhere in the switch and is the same between vendors



Current 4gb fibre channel switch and want to upgrade to 8gb just need to upgrade the 4gb switches to 8gb



Fas6030 and 6070 have 8 x 2gb onboard fc ports

Fas6040 and 6080 have 8 x 4gb onboard fc ports



Snapdrive



An FCP license is needed for Snapdrive



31.5Mb is the smallest lun that can be created using Snapdrive



Fcp license needed for Snapdrive



Best practice for Snapdrive is to create a user account with admin privileges



Volumes



Luns



Boot volumes need persistant bindings



Sanlun show –p will show you on a solaris machine how many paths are available



Lun stats –I 5 will show you the throughput of a netapp lun



To share the same lun between hosts you need a host based clustered file system like VMFS



31.5Mb is the smallest lun that can be created using Snapdrive



Igroups are mapped to portsets



Solaris error messages are logged in the following location /var/adm/messages



There is no difference between an fc lun and an iscsi lun



Copy on write – 1 read 2 writes



Lun stats –I 5



Portsets bound to igroups



DSM for windows controls fc and iscsi paths at the same time



Cfgshow



Show zone set active



With an existing emc setup check the lun layout





Things to document with an existing netapp setup



  • Snapshot config
  • Protocols in use
  • Igroups being used
  • Disk ownership settings

Which doc would show the cab diagram (cabinet diagram)



100gb lun

10% data change a day

Snap every night

7 snaps

10% of 100gb = 10gb x 7 = 70gb

100% fractional reserve = 100gb

100gb lun = 100gb + fractional reserve  + 70gb = 270gb



Fractional reserve = 0%

Snap reserve = 0%

3 x 100gb luns

No snaps

3 x 100gb = 300gb



Gurantee = volume

3 x 100gb luns = 300gb

50% fractional reserve = 150gb

2 snaps per week keep 2 weeks

10% data change = 30gb x 2 = 60gb x 2 = 120gb

300gb + 150gb + 120gb = 570gb



The native gui to manage brocade switches is web tools



The best way to test a storage failover is to perform a storage takeover on each controller



RDM’s can be used with NPIV



Tools to show  wwn;s and wwpn’s – sanlun fcp show adapter, esxcfg-info



When using dsm diable alua on igroups



Storage type plugins – VM_stap_ALUA, MVW_SATP_Default_AA



Fc supported hop count



Brocade 6

Cisco 5

McData 3

Qlogic 4



With aix to discover newly created luns use – cfgmgr



Lesdev verify hdisk mpio

Lsattr info about setup

Sanlun lun show –p info about setup



DSM Device specific module



TimeOutValue = how long i/o requests are held at iscsi layer before time out



Request windows hot fixes from the microsft website



Snapdrive needs to be installed before DSM



MaxRequestHoldTime



Disable Microsoft mpio if Snapdrive mpio is enabled



Host utilities kit must be enabled in a cluster



Initiator node names cannot have _ in the name



DSM set path verify enabled set to 0



Qlogic host bus adapterLinkDownTimeOut set to 5



MaxRequestHoldTime = time the initiator retries failed i/o requests when a path to a target is lost



Initiator – disk shelf, host

Target – tape drive, netapp controller



You would find an initiator on an esx host



LUN ID is not a HBA characteristic



SCSI command is encapsulated into FC, ISCSI and FCoE protocols.



Target is connected via onboard fc ports and add in target HBA cards





Lun masking = igroups



Isns provides a list of target initiators



Sessions are related to target portal groups connections are related to interfaces



Lun show –m shows lun maps to igroups



Lossless Ethernet DCB data center bridging alias CEE converged enhanced Ethernet



FCoE includes pfc priority based flow control, ETS Enhanced Transmission Selection, CN Congestion Notification.



802.1Qbb (PFC)

8021Qaz (ETS)

802.1Qau (CN)



FCoE card is called a UTA Unified Target Adapter



OM-3 multimode 62.5 micron fc cables with SFP connectors



DSM controllers fc & Iscsi



Layer 1 of ISO stack = Physical Layer



Jumbo frames can increase performance at 1gb but essential for 10Gb



Switching functions are at the layer 2 level



You can have nics at different speed in a VIF



Switching functions are at layer 2



Training for Exam NS0-501:


Training for Exam NSO-510:


Training for Exam NSO-520:


Training for Exam NSO-530:









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