SAM-QFS

Question 1

What is QFS?

Answer 1

QFS is a high performance filesystem.

Question 2

What is SAM-QFS?

Answer 2

A product that enables archiving filesystem data. It includes a storage and archive manager along with the Sun QFS filesystem.

Question 3

What can SAM-QFS use as archive media?

Answer 3

Disk slices in another filesystem, removable tape or magneto-optical cartridges in automated or manually loaded storage devices.

Question 4

Can you use QFS without SAM-QFS?

Answer 4

Yes

Question 5

Can you use SAM-QFS without QFS?

Answer 5

No

Question 6

What is the SAM-QFS manager?

Answer 6

A browser-based graphical user interface that enables you to confugre, control, protect, and monitor one or more file systems from a central location.

Question 7

What is SAM-Remote

Answer 7

Sam remote is a client and server storage management system enabling sharing of libraries and other removable media devices in a SAM-QFS environment.

Question 8

How do you configure SAM-Remote

Answer 8

1. Create a Sun QFS filesystem
2. Test the Sun QFS filesystem to verify that it’s configured properly
3. Use the SAM-Remote instructions to enable remote storage and archive management.

Question 9

What is HA-QFS?

Answer 9

A Sun QFS filessytem in an Oracle Solaris Cluster environment configured for high availability.

Question 10

What is HA-SAM?

Answer 10

SAM-QFS configured for high availability using Oracle Solaris Cluster software. If the primary node fails, the cluster software automatically relocates the SAM-QFS archiving functions from a failed primary node to a designated secondary node. This requires the Sun QFS Sun Cluster agent, so this configuration must be installed with a shared Sun QFS filesystem that is mounted and managed by the Sun QFS Sun Cluster agent.

Question 11

What’s the difference between Solaris and Linux Sun QFS clients?

Answer 11

The Linux clients are restricted to client-only behavior. They can’t be metadata servers. They also support interaction with SAM-QFS software, but have Sun QFS filesystem functionality only.

Question 12

How do you set the online disk space threshold?

Answer 12

TBD

Question 13

What are the design considerations for archiving?

Answer 13

1. Access and usage patterns
2. Filesystem sizes and usage patters, frequency of file updates, average file sizes, batch jobs that will wait for dries/media, users that must have priority
3. Archiving policies: number of media copies, release policies, level of disk over-subscription
   4 Media characteristics: size, drive setup times

Question 14

What is a ma type file system?

Answer 14

File system metadata only.

Question 15

What is a ms type file system?

Answer 15

File system metadata and file data on the same device.

Question 16

How many disk devices or partitions does a ma file system require?

Answer 16

Two. One for file data and one for metadata.

Question 17

How many disk devices or partitions does a ms file system require?

Answer 17

One, on which file data and metadata are saved.

Question 18

Why would you use multiple disk devices?

Answer 18

For increased I/O performance.

Question 19

How do you format partitions for ma or ms file systems?

Answer 19

You don’t. They don’t require any special formatting.

Question 20

What types of connection can be used from server to disks?

Answer 20

Fibre Channel or SCSI.

Question 21

How many metadata servers are required?

Answer 21

One.

Question 22

What requirements exist if you want to change the metadata server?

Answer 22

You have to have a spare available, and that spare must be running on the same hardware platform (SPARC vs x64)

Question 23

If you see the error “client package versionx mismatch, should be y.”, what does this mean?

Answer 23

It means you have different versions of SAM-QFS installed on hosts that are part of the same shared filesystem.

Question 24

What are the two possible configurations for SAM-QFS Manager software

Answer 24

1. Stand-alone management station to manage one or more Sun QFS hosts
2. Additional software on the Sun QFS host

Question 25

How do you estimate the disk cache size required?

Answer 25

Largest file in bytes + the amount of space needed for working files.

Question 26

How do you estimate the metadata cache size

Answer 26

``` Must be large enough to contain: 1. Two copies of the superblock (2x16k) 2. Reservation maps for metadata space plus data space 3. Inode space (512/each) 4. Indirect blocks (16K each) 5 Directory data space (16K each) ```

Question 27

Can you mix media types within a library?

Answer 27

No. If you can partition your tape library into multiple virtual libraries, you can use one media type in each.

Question 28

How do you disable auto-boot on a solaris server?

Answer 28

setenv auto-boot? false at the ok> prompt

Question 29

How do you get a list of all target IDs and LUNS for each connected device from the ok> prompt?

Answer 29

probe-scsi-all

Question 30

How do you identify the libraries or tape drives from the ok> prompt?

Answer 30

ok show-devs ok select /pci@1f,2000/SUNW,qlc@1 ok show-children

Question 31

How do you check to see if the expected tape devices exist from within the OS?

Answer 31

look at /dev/rmt

Question 32

How do you check to see if the expected disk devices exist from within the OS?

Answer 32

Look at /dev/dsk and /dev/rdsk.

Question 33

What are the SAM-QFS and QFS packages?

Answer 33

SUNWqfsr, SUNWqfsu (file system only) SUNWsamfsr, SUNWsamfsu (archiving and file system) SUNWfsmgrr, SUNWfsmgru (SAM-QFS manager)

Question 34

Where are the device special files for SAM-QFS?

Answer 34

/dev/samst

Question 35

Where are the software specific commands?

Answer 35

/etc/fs/samfs

Question 36

Where are the configuration files?

Answer 36

/etc/opt/SUNWsamfs

Question 37

Where are the site-customizable scripts

Answer 37

/etc/opt/SUNWsamfs/scripts

Question 38

Where are most of the SAMFS commands, binaries, libraries, includes, man pages, etc?

Answer 38

/opt/SUNWsamfs/*

Question 39

Where are the fault notification files?

Answer 39

/etc/opt/SUNWsamfs/scripts/sendtrap, /opt/SUNWsamfs/sbin/fault_log, /opt/SUNWsamfs/sbin/tapealert_log, /opt/SUNWsamfs/sbin/tapealert_trap

Question 40

Where is the main configuration file for SAM-QFS?

Answer 40

/etc/opt/SUNWsamfs/mcf

Question 41

Which configuration files are required if you're only using the file system features?

Answer 41

/etc/opt/SUNWsamfs/samfs.cmd and defaults.conf.

Question 42

What is samfs.cmd for?

Answer 42

Filesystem mount parameters

Question 43

What is defaults.conf for?

Answer 43

.

Question 44

What is archiver.cmd for?

Answer 44

.

Question 45

What is preview.cmd for?

Answer 45

.

Question 46

What is recycler.cmd for?

Answer 46

.

Question 47

What is releaser.cmd for?

Answer 47

.

Question 48

What command do you use to install the QFS or SAM-QFS packages?

Answer 48

pkgadd

Question 49

How do you revert to a previous QFS or SAM-QFS version?

Answer 49

1. /opt/SUNWsamfs/sbin/backto 5.2 | 2. Then remove the current release package