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Replace external tape drive.

 
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Occasional Advisor

Replace external tape drive.

Hi,

We need to Replace external tape drive HP DAT 72 on rx2600 server. it is a cluster node.Can be replace the tape drive online without shuting down the server? Is there a chance to hang the server when we replace online?
13 REPLIES 13
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Honored Contributor

Re: Replace external tape drive.

> [...] external tape drive [...]

Not a very detailed description of where it's
connected. Or what else is connected where.

What else is on the same SCSI bus?

On my rx2600, I believe that the built-in
external SCSI port shares a bus with the "2"
disk in the front. So, if that disk is busy,
then you may not want to play with that bus.

If the tape drive is connected to some add-in
PCI SCSI card, and it's the only device on
that bus, then can probably do what you want.
Highlighted
Occasional Advisor

Re: Replace external tape drive.

tape is connected on below given path

ext_bus 3 0/1/1/1 mpt CLAIMED INTERFACE SCSI Ultra320
/dev/mpt3
target 10 0/1/1/1.3 tgt CLAIMED DEVICE
tape 0 0/1/1/1.3.0 stape CLAIMED DEVICE HP C7438A
/dev/rmt/0m /dev/rmt/c3t3d0BESTb /dev/rmt/c3t3d0BESTnb /dev/rmt/c3t3d0DDSb /dev/rmt/c3t3d0DDSnb
/dev/rmt/c3t3d0BEST /dev/rmt/c3t3d0BESTn /dev/rmt/c3t3d0DDS /dev/rmt/c3t3d0DDSn
target 17 0/1/1/1.7 tgt CLAIMED DEVICE
ctl 4 0/1/1/1.7.0 sctl CLAIMED DEVICE Initiator
/dev/rscsi/c3t7d0


No other disks are connected on this path

below given is the path for other internel disks.


target 3 0/1/1/0.0 tgt CLAIMED DEVICE
disk 1 0/1/1/0.0.0 sdisk CLAIMED DEVICE HP 36.4GMAU3036NC
/dev/dsk/c2t0d0 /dev/dsk/c2t0d0s2 /dev/rdsk/c2t0d0 /dev/rdsk/c2t0d0s2
/dev/dsk/c2t0d0s1 /dev/dsk/c2t0d0s3 /dev/rdsk/c2t0d0s1 /dev/rdsk/c2t0d0s3
target 4 0/1/1/0.1 tgt CLAIMED DEVICE
disk 2 0/1/1/0.1.0 sdisk CLAIMED DEVICE HP 36.4GMAU3036NC
/dev/dsk/c2t1d0 /dev/dsk/c2t1d0s2 /dev/rdsk/c2t1d0 /dev/rdsk/c2t1d0s2
/dev/dsk/c2t1d0s1 /dev/dsk/c2t1d0s3 /dev/rdsk/c2t1d0s1 /dev/rdsk/c2t1d0s3
target 9 0/1/1/0.7 tgt CLAIMED DEVICE
ctl 2 0/1/1/0.7.0 sctl CLAIMED DEVICE Initiator


I am attaching the ioscan -fn output.
Please advise whether i can replace tape drive online.
Highlighted
Acclaimed Contributor

Re: Replace external tape drive.

The official procedure is to power off the bus (the system) before open the bus.

Everything else you do on your own risk.

Hope this helps!
Regards
Torsten.

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Honored Contributor

Re: Replace external tape drive.

Hi,

if the said server rx2600 cluster node is running on cluster pkg.

1.cmhaltpkg -v -n
2.cmhaltcl
3. shutdown -h -> shutdown server.


Than proceed with replacement of external tape drive

else if its passive & no pkg running.

1.cmhaltnode
2.shutdown -h shutdown server

Than proceed with replace of external
Problems are common to all, but attitude makes the difference
Highlighted
Regular Advisor

Re: Replace external tape drive.

Hi,
Is this tape drive installed in server or tape array?
Highlighted
Occasional Advisor

Re: Replace external tape drive.

It is a single tape drive whcih is attached externally. model C7438A DAT72
Highlighted
Regular Advisor

Re: Replace external tape drive.

If it is standalone (external) and connected to one of the node via scsi cable, then just
power off the tape, remove the power cable, remove the scsi cable and install new drive and connect scsi cable, power cable and power on the tape drive.
Do ioscan -fnC tape
Highlighted
Occasional Advisor

Re: Replace external tape drive.

Is it officially recommended? Can we try that in a production setup?
Highlighted
Regular Advisor

Re: Replace external tape drive.

Assuming that this tape drive is not mounted in server body. It is external to server.
Only link is via external scsi cable.
You can perform as described.