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тАО05-04-2007 12:33 AM
тАО05-04-2007 12:33 AM
SCSI adapters for 9000 D270/D280
Does anyone know if it's possible to find LVD scsi adapters to D270/D280 servers..?
I'm trying to connect an Ultrium-3 drive to these old machines.
If not, what would the appropriate part number be for a HVD controller for these machines?
-pelle
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тАО05-04-2007 03:20 AM
тАО05-04-2007 03:20 AM
Re: SCSI adapters for 9000 D270/D280
because the controller cards are using the GSC bus, the number of controllers are very limited.
There are only HVD and SE SCSI controllers available.
The SE SCSI is compatible, but too slow.
I guess it will not work to connect a Ultrium-3 to this old server.
This tape drives are not available for HVD AFAIK.
Hope this helps!
Regards
Torsten.
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тАО05-04-2007 08:12 AM
тАО05-04-2007 08:12 AM
Re: SCSI adapters for 9000 D270/D280
http://www.paralan.com/converters.html
http://www.blackbox.com/Catalog/Detail.aspx?cid=308,1559,1566&mid=3202
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тАО05-04-2007 08:35 AM
тАО05-04-2007 08:35 AM
Re: SCSI adapters for 9000 D270/D280
The nearest to Single ended scsi available is the Eisa interface A2679A with a 50pin ext connector.
Only any good if your running 32bit kernel though, and it would be very slow, and not really recommended
A4107A is the FWD interface.
Andy
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тАО05-08-2007 10:44 PM
тАО05-08-2007 10:44 PM
Re: SCSI adapters for 9000 D270/D280
Thanks for your help.
-pelle
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тАО05-09-2007 03:07 AM
тАО05-09-2007 03:07 AM
Re: SCSI adapters for 9000 D270/D280
On a good day, with no activity on the system, your D-class boxes can probably get data sequentially at 20 Mbytes/sec, still too slow for the Ultrium 960. Look at the Ultrium 215 or 230 which can run as slow as 6 Mbytes/sec which matches your system speed. These slower drives will run much faster (2x-4x) than the Ultrium 960 because they won't have to stop and restart all the time.
Bill Hassell, sysadmin
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тАО05-17-2007 09:04 PM
тАО05-17-2007 09:04 PM
Re: SCSI adapters for 9000 D270/D280
Thanks again for the answers. I bought a hvd scsi card for a small amount of money, used a lvd/hvs scsi converter and the drives I tested, LTO-3 and LTO-1 seemed to work fine.
I'm trying to find a good way of testing the speed to see which one is the fastest of the 2 drives on this machine.
Regards
pelle
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тАО05-18-2007 12:46 AM
тАО05-18-2007 12:46 AM
Re: SCSI adapters for 9000 D270/D280
du -kxs /var
Then using the number of Kbytes returned from du, divide that by the number of seconds for a bytes/sec speed rating. Note that test #1 will be skewed because of buffer cache effects. Run it again for a more useful time. Then do the same for another drive.
To maximize performance, use fbackup for the tests along with the requisite config file:
blocksperrecord 4096
records 64
checkpointfreq 4096
readerprocesses 6
maxretries 5
retrylimit 5000000
maxvoluses 200
filesperfsm 2000
The fbackup command line would be something like:
fbackup -i /var -v -c config-file -f /dev/rmt/0m
Unlike tar (cpio, pax, ftio, dump, vxdump, etc), fbackup is a high performance program designed to keep high speed tape drives running at full speed.
For /var with 500 megs of occupied data, you can expect the LTO1 drive to run at 7.5 min to 30 Mbytes/second (HP Ultrium 230 is the fastest LTO1) and 60 to 120 Mbytes/sec for LTO3. If you are measuring siginificantly lower speeds, the computer + disk is too slow to support the LTO drives.
Bill Hassell, sysadmin
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тАО05-18-2007 02:29 AM
тАО05-18-2007 02:29 AM
Re: SCSI adapters for 9000 D270/D280
Thanks a lot.
-pelle
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тАО05-18-2007 11:51 AM
тАО05-18-2007 11:51 AM
Re: SCSI adapters for 9000 D270/D280
This will be very helpful:
du -kx /var | sort -rn | head
This shows the largest directories. Inside a directory, use:
ll | sort -rnk5 | head
If /var is OK and / is full (and it happened after you ran tar), you very likely misspelled the the device file name. /dev/rmt/om creates a very large file while /dev/rmt/0m will write to the tape -- assuming 0m is the tape drive.
Bill Hassell, sysadmin