DS2405 JBOD disk size

[Gerald Taylor]

Hello guru's

We recently installed two DS2405 direct connected to a server running HPUX 11.11 it contains twenty 73GB (A6795A) disk drives. We tried to mirror the drives to each other and we found that the extents did not properly match up. For example if I do a diskinfo on the drives I get three different results:
# diskinfo /dev/rdsk/c19t1d0
SCSI describe of /dev/rdsk/c19t1d0:
vendor: HP 73.4G
product id: ST373405FC
type: direct access
size: 140000000 Kbytes
bytes per sector: 520
- in10nfs0 - root - /home/ggtaylor
# diskinfo /dev/rdsk/c19t2d0
SCSI describe of /dev/rdsk/c19t2d0:
vendor: HP 73.4G
product id: ST373405FC
type: direct access
size: 71687369 Kbytes
bytes per sector: 512
- in10nfs0 - root - /home/ggtaylor
# diskinfo /dev/rdsk/c19t5d0
SCSI describe of /dev/rdsk/c19t5d0:
vendor: HP 73.4G
product id: ST373405FC
type: direct access
size: 70000000 Kbytes
bytes per sector: 512

Is there anyway to format these drives to make them look like:
vendor: HP 73.4G
product id: ST373405FC
type: direct access
size: 71687369 Kbytes
bytes per sector: 512

This gives us the most space out of the three. So far I tried a JBODfmt and it doesn't change anything. Any suggestions? Thanks in advance.

Gerald

[Pete Randall]

Gerald,

I think the question here is "why is diskinfo returning different sizes for 3 supposedly identical ST373405FC disks?" and I think you're going to have to ask HP. The only thing I can think of is some sort of firmware issue.


Pete

[Gerald Taylor]

That is a good question it is the first time I have ever run into this problem. We have eight of these systems. However I am still open to suggestions on getting them to work.

Gerald

[Sudeesh]

Gerald,

Looks like a Firmware issue,
Still you can give a try using mediainit.



Sudeesh

[Mohanasundaram_1]

Hi Gerald,

The disk /dev/rdsk/c19t1d0 was probably used in a Virtual Array (VA7xxx)
This is evident from the line

bytes per sector: 520

So mediainit may help on this disk.

Diskinfo -v for all 3 disks will indicate to you the firmware version.

The LCC firmware should also be checked.

Please revert back as we too are keen to know why this problem is appearing.

With regards,
Mohan.

[Gerhard Roets]

Hi Gerald

IO can not remember the exact command right now but ... you have to use command view sdm(you should have gotten a copy with the ds2405) to format those disks. You can format them all at once and the blocksize must go to 512.

(I think the command might have been arrayfmt not to sure did this a while ago)

Some of thoose disks came fro a VA thats why you are struggling.

HTH
Gerhard

[Ravi_8]

Hi

Going mediainit on all the disk would help you.

To Mohanasundaram: How r u? I am Ravi from IBM,Bangalore

[Gerhard Roets · Accepted solution]

Hi Ravi

Mediainit does not change the block size. I do remember that isthe first of the things i tried, when I had that issue. Mediainit just inits it to 520 bytes per sector.

That is why CMDVSDM is required to change the sector size.

Regards
Gerhard

[Gerhard Roets]

Hi gerald did some research

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=759164

Look at the question.

JBODfmt is the one you want. Be warned though that all the disks might get wacked.

Hence look at the help and man pages.

Regards
Gerhard

[Gerhard Roets]

Hi Gerald

Look at this one in specific. I do apologise for the multiple replies since I found one and then a better one etc etc ad naseum.

http://forums1.itrc.hp.com/service/forums/questionanswer.do?threadId=181588

Look at the second last reply it was made by Steve Longenecker that is exactly what you want to do.

Regards
Gerhard

[Gerald Taylor]

Thanks for all the responses. I think I figured out what the problem was. The correct way to get disk formatted is to use the "JBODfmt" command. Originally I used this command and would then do diskinfo and see the same results. I am not sure why this happened but after running pvcreate again (may have omitted on the first run) the disk show up properly for a JBOD connection, which is to say a diskinfo returns:
# diskinfo /dev/rdsk/c19t2d0
SCSI describe of /dev/rdsk/c19t2d0:
vendor: HP 73.4G
product id: ST373405FC
type: direct access
size: 71687369 Kbytes
bytes per sector: 512

All the disk now have the same number of extents and have been mirrored utilizing all the space available. Thanks for everyones help.

Gerald

[Gerald Taylor]

Install Command View
JBODfmt /dev/dsk/cXtXdX
pvcreate -f /dev/rdsk/cXtXdX