Tape drives confusion

[wannawin]

Hello Team,

The st drivers is the OS driver that create drive entries in /dev/rmt . There are 149 device entries under /dev/rmt but when i ran sgscan command then it shows 32 tape deivce entries only.

if /dev/rmt shows 149 device entries then there must be 149 tape drives configured at nbu end but it shows only 32 tape devices.

Secondly, if i want to rebuild the tape drives then what is the maximum number of target and luns i have to mention.

[Marianne]

The sg driver used by NBU on Solaris will by default only add 7 targets per controller and 2 luns per target.

It is quite normal to need to rebuild sg drivers on Solaris.

See this post for steps that I usually follow: recreate /dev/sg/* on solaris 10 without reboot

[Deb_Wilmot]

There are several entries for under /dev/rmt for each drive.

i.e. for /dev/rmt0 there will be:

rmt/0lbn
rmt/0mbn
rmt/0hbn
rmt/0cbn

So just because there are more entries for the rmt entries - doesn't mean that NetBackup isn't functioning correctly. We will only look or the cbn entities.

[wannawin]

Hello Marianne/Deb.

Thanks for update.. but my doubt is , if there are 149 device entries in /dev/rmt then it means 149 tape drives should be configured under NBU.

But here , only 32 tape drives show in sgscan output . Please find attached out for the same.

One more question, dev/rmt shows drives at os level, is it right or wrong..

[Marianne]

Please read though my previous post again..............................

An the TN in the link..................

You need to specify large numer of targets, not luns when rebuilding sg driver.

[Marianne · Accepted solution]

@wannawin

Are you 100% sure that this large number of devices actually exist?

It seems to be an aweful lot to be attached to a single host.

When there is no Persistent Binding in place, the target numbers may change when the server is rebooted. The tape drives could then be added with new device addresses, while old entries are left in the /dev/rmt tree.

Please do the following (procedure is safe because we are only working with symbolic links).

# cd /dev/rmt
# rm *
# devfsadm -C -c tape
# ls -l *cbn
# ls -l *cbn |wc -l

[mph999]

I disagree that xx drive paths = xx drives in NBU ...

You can have 100 cbn files in /dev/rmt and one physical tape drive if you really wanted to - it would be pointless, but possile ... Certainly, when I mess around with test servers I sometimes end up with device files that have nothing on the end of them.

I'm failrly certain that NBU sends a scsi command during device wizard, if no response, it doesn't configure that path as a drive.

Please note, generally with sg these days, it should be run without the mt and ml options, as the config for the drives is via WWN, not target/ lun.  Adding the standard mt 15 ml 5 or whatever the TNs generally say is a catch all, trying to get a command that will work in most situations.  The problem with this, is that it creates 75 sg files that 'might' have no device, this drastically slows down scan / sgscan / tpautoconf and device wizard, as it scans every path.

The correct way (well I believe) , is to create device files and then delete those that are not needed.

If the drives/ library are configured via WWN, then you just need sg.build -all option.

If this doesn't get all the devices, then the 'missing WWNs need to be added into sg.conf / sg.links files manually.

When you are used to sg, it is fairly straightforward, but because there are a few things that can catch you out, it is quite difficult to explain 100% clearly.

To answer your question,  it does appear you are configure via target/ lun: eg

.../st@48,0:cbn

So this would be target 48 (but you need to convert this to decimal), lun 0.

So find the higherst target number (remember to convert), find the highest lun number and use these values. Then in the sg.links and .conf files, delete the lines that are not needed.

I will add this little note ...

The strings st@2,0 st@3,0 st@13,1 and st@20,0 at the end of the device paths.  These are the scsi target and lun values.

    Also Note:  The target and lun values for "st@?,?" are in hexadecimal format, NOT decimal.

I managed to forget that the values are hex a while back, which was slightly embarrasing as I couldn't work out why we couldn't configre the sg driver ...

M

[wannawin]

Hello Marianne. what does this command do devfsadm -C -c tape can I run this in production

[wannawin]

Hello Marianne. ls -l *cbn |wc -l 149 # ls -l *cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 0cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@41,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 100cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@46,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 101cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@47,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 102cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@48,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 103cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@49,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 104cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@4a,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 105cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@4b,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 106cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@4c,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 107cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@4d,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 108cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@4e,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 109cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@6,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 10cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@1d,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 110cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@7,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 111cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@8,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 112cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@a,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 113cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@b,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 114cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@d,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 115cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@e,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 116cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@f,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 117cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@12,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 118cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@15,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 119cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@19,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 11cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@1e,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 120cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@1b,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 121cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@1c,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 122cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@20,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 123cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@22,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 124cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@25,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 125cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@26,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 12:57 126cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@3e,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 12:57 127cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@3f,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 12:58 128cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@45,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 12:58 129cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@4f,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 12cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@1f,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 12:58 130cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@50,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 12:58 131cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@51,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 12:58 132cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@52,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 12:58 133cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@4,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 12:58 134cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@5,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 135cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@4c,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 136cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@4d,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 137cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@4e,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 138cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@4f,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 139cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@50,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 13cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@22,0:cbn lrwxrwxrwx 1 root bin 53 Sep 20 13:45 140cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@51,0:cbn lrwxrwxrwx 1 root bin 53 Sep 20 13:45 141cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@52,0:cbn lrwxrwxrwx 1 root root 53 Oct 10 12:05 142cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@53,0:cbn lrwxrwxrwx 1 root root 53 Oct 10 12:05 143cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@54,0:cbn lrwxrwxrwx 1 root root 53 Nov 24 04:23 144cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@17,0:cbn lrwxrwxrwx 1 root root 53 Nov 24 04:23 145cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@53,0:cbn lrwxrwxrwx 1 root root 53 Nov 24 04:23 146cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@54,0:cbn lrwxrwxrwx 1 root root 53 Nov 24 04:23 147cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@55,0:cbn lrwxrwxrwx 1 root root 53 Nov 24 04:23 148cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@56,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 14cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@24,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 15cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@25,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 16cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@26,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 17cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@28,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 18cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@2a,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 19cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@2b,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 1cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@42,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 20cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@2e,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 21cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@2f,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 22cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@30,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 23cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@31,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 24cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@32,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 25cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@33,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 26cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@34,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 27cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@35,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 28cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@36,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 29cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@37,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 2cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@44,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 30cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@38,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 31cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@39,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 32cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@3a,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 33cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@3b,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 34cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@3c,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 35cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@3d,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 36cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@40,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 37cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@41,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 38cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@42,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 39cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@44,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 3cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@45,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 01:47 40cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@0,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 01:47 41cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@1,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 01:47 42cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@2,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 01:47 43cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@3,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 01:47 44cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@9,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 01:47 45cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@c,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 46cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@10,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 47cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@11,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 48cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@13,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 49cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@14,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 4cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@46,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 50cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@16,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 51cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@17,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 52cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@18,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 53cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@1a,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 54cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@1d,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 55cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@1e,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 56cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@1f,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 57cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@21,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 58cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@23,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 59cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@24,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 5cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@47,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 60cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@27,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 61cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@28,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 62cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@29,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 63cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@2a,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 64cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@2b,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 65cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@2c,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 66cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@2d,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 67cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@2e,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 68cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@2f,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 69cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@33,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 6cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@48,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 70cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@38,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 71cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@39,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 72cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@3a,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 73cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@3b,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 74cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@3c,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 75cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@3d,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 76cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@3e,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 77cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@3f,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 78cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@40,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 01:47 79cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@43,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 7cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@49,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 80cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@0,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 81cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@1,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 82cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@2,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 83cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@3,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 84cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@4,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 85cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@5,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 86cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@6,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 87cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@7,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 88cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@9,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 89cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@a,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 8cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@4a,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 90cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@c,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 91cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@d,0:cbn lrwxrwxrwx 1 root root 52 Sep 20 11:14 92cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@e,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 93cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@10,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 94cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@11,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 95cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@14,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 96cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@15,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 97cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@16,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 98cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@18,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 11:14 99cbn -> ../../devices/pci@84,2000/fibre-channel@1/st@43,0:cbn lrwxrwxrwx 1 root root 53 Sep 20 13:29 9cbn -> ../../devices/pci@85,2000/fibre-channel@1/st@4b,0:cbn

[Mark_Solutions]

You really need to answer the questions asked of you... the main one being ...

how many drives do you actually have in your tape library

Then we have a starting point - next question is how they are connected - if via fibre (i believe that they are) how are they zoned and do they have multiple paths - because 10 drives with 8 paths each to the server will appear as 80 devices - but only 10 drives in NetBackup

Please read through the above posts and what you have been asked for and we may be able to assist further

[Marianne]

 ls -l *cbn |wc -l 149 

So, you exectuted the last of the commands that I have suggested.

What about these??

# cd /dev/rmt
# rm *
# devfsadm -C -c tape

Ask your Solaris sysadmin. These commands are safe.

It will delete all the symbolic links in /dev/rmt (rm) and then recreate links for only the devices that actually exist (devfsadm). We ensure that only tape devices are scanned for with -C -c tape.

How many tape drives are REALLY in this environment?
There is NO way that any server can actually manage or use 149 tape drives!

[wannawin]

Hello Marianne, Below are the tape drives details: ACSSA> q drive all 2014-01-30 14:53:54 Drive Status Identifier State Status Volume Type 0, 0, 4, 0 online in use M81900 T9940B 0, 0, 4, 1 online in use M82472 T9940B 0, 0, 4, 2 online in use M80628 T9940B 0, 0, 4, 3 online in use M82062 T9940B 0, 0, 4, 4 online in use M82403 T9940B 0, 0, 4, 5 online in use M80273 T9940B 0, 0, 4, 6 online in use M82313 T9940B 0, 0, 4, 7 online available T9940B 0, 0, 4, 8 online in use M80420 T9940B 0, 0, 4, 9 online available T9940B 0, 0, 4,10 online available T9940B 0, 0, 4,11 online available T9940B 0, 0, 4,12 online available T9940B 0, 0, 4,13 online available T9940B 0, 0, 4,14 online in use M82580 T9940B 0, 0, 4,15 online available T9940B 0, 0, 4,16 online in use M80341 T9940B 0, 0, 4,17 online in use T9940B 0, 0, 4,18 online in use M82482 T9940B 0, 0, 4,19 online in use M80291 T9940B 0, 0, 9, 0 online in use M80099 T9940B 0, 0, 9, 1 online available T9940B 0, 0, 9, 2 online available T9940B 0, 0, 9, 3 online in use M81427 T9940B 0, 0, 9, 4 online in use M80633 T9940B 0, 0, 9, 5 online available T9940B 0, 0, 9, 6 online available T9940B 0, 0, 9, 7 online in use M80328 T9940B 0, 0, 9, 8 online available T9940B 0, 0, 9, 9 online available T9940B 0, 0, 9,10 online in use M82570 T9940B 0, 0, 9,11 online available T9940B 0, 0, 9,12 online available T9940B 0, 0, 9,13 online available T9940B 0, 0, 9,14 online available T9940B 0, 0, 9,15 online in use M82544 T9940B 0, 0, 9,16 online in use M83891 T9940B 0, 0, 9,17 online in use M82337 T9940B 0, 0, 9,18 online available T9940B 0, 0, 9,19 online in use M82253 T9940B 0, 0,10, 0 offline available T9840B 0, 0,10, 1 online in use M83926 T9940B 2014-01-30 14:53:55 Drive Status Identifier State Status Volume Type 0, 0,10, 2 online in use M82247 T9940B 0, 0,10, 3 online in use M82445 T9940B 0, 0,10, 4 online in use MR0564 T1A 0, 0,10, 5 online available T1A 0, 0,10, 6 online in use MR0881 T1A 0, 0,10, 7 online in use MR0603 T1A 0, 0,10, 8 online in use MR0849 T1A 0, 0,10, 9 online in use MR0089 T1A 0, 0,10,10 online in use MR0808 T1A 0, 0,10,11 online in use MR0638 T1A 0, 0,10,12 online available T1A 0, 0,10,13 online in use MR0265 T1A 0, 0,10,14 online in use MR0446 T1A 0, 0,10,15 online in use MR0624 T1A 0, 0,10,16 online in use MR0260 T1A 0, 0,10,17 online in use MR0076 T1A 0, 0,10,18 online in use MR0536 T1A 0, 0,10,19 online in use MR0128 T1A can I run above mentioned commands to delete symbolic links and to recreate link in running environment.. means is there a need to stop /suspend backups

[wannawin]

One more question .. apart from this thread... how to find out serial no of all drive in ACSLS.. i know below one but it shows only serial no of one drive at a time.. display drive *,*,*,* -f type serial_num

[Mark_Solutions]

It hasnt formatted very well since publishing your last post - you may want to add it as a text file

A quick look reveals only 40 unique names - but some on the same location so may be less

There are 38 starting in M and 2 starting in T (maybe 38 drives and 2 robots?)

[Marianne]

Please give us properly formatted output.

As Mark said - paste everything in a text file - one drive per line.

I can see that the 'M's are the media-id's in the drives. The T's are tape drives - T9940B and T1A's.
I am not going to try and count. Will do when you give us properly formatted output.

display drive *,*,*,* -f type serial_num is the only way I know to get serial #s for tape drives in ACSLS.

[wannawin]

Hello Marianne. Please find attached output in .txt format

[Marianne]

So, by now you have probably also counted the tape drives in ACSLS?

60 tape drives, right?

Do you agree that the entries in /dev/rmt do not match up?

Do you know if there are multiple paths for each tape drive?

Have you tried to cleanup and recreate device entries as suggested previously?

Only when you know that /dev/rmt entries represent actual drives, use the steps suggested above to rebuild the sg drivers.

As a matter of interest - why are so many tape drives zoned/presented to one server?
There is no way that one server can manage or use this amount of tape drives...

[wannawin]

Hello Marianne.

Yes there are 60 tape drives in ACSLS.

Yes, i agree that entries in /dev/rmt did not match up.

Yes, there are multiple path for each tape drives because all these tape drives are shared with other media servers, please find attached txt output for the same.

All these tape drives are shared , so on master server only  i have to clean and recreate device entries or there is a need to do this on media servers as well.

And when i have to install SG drivers before clean and recreate of device entries or after this

[wannawin]

Hello Marianne.

Please find attachemnt

[Marianne]

You need to follow steps that I have posted above to delete and recreate /dev/rmt entries, then follow steps in this post: : recreate /dev/sg/* on solaris 10 without reboot to build entries for sg driver (sg.build) followed by installation of sg driver (sg.install). 

PS: sharing tape drives with other media servers is NOT multipathing. 
Multipathing is when more than one hba is zoned to the same drive.
Once you have deleted and recreated /dev/rmt entries, you will have a clear picture of how many tape drives can be seen by the OS.