My hp LTO5 tape is going at 8mb/s. HELPP PLEASE?

gotspice
gotspice used Ask the Experts™
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It suppose to go at like 300mb or 1gb or more? when i test i get drive is experincing pooling rate (1.0/sec ) on initiator ID 000000 any help?
Also i bought 2 different SAS cards Adaptec 1045 & HP212zm
It doesn't work properly on any of them.

I am not sure if it the tape drives fault or something wrong i am doing?
any help?
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An LTO-5 drive is capable of writing at up to 120MB/sec (that's MegaBytes per second). The trick to making backup devices go fast is getting data to them at a fast enough rate. It sounds like you have the right connectivity with the Adaptec SAS controller, although it's SAS 1 so limited to 3Gb/sec or about 300MB/sec - although remember that that is the interface speed, not the speed which the tape drive writes at.

Check that you have the Adaptec card in a 4-lane PCI-e slot. Copy a large file (like a DVD ISO image) to local disk then see how fast the  backup of that file goes at.

What backup software are you using and what is the backup server hardware configuration?

Author

Commented:
I have a dell power edge 2950 with 4gb and dual core xeon. I am running a 2003 server. I placed the adaptac sas controller on the first Pci-e slot in the sever. I am currently used nova backup Bussiness 12.0 . I also tried with backup utility that was built into the windows server but still no luck going very slow. It is take me almost 10 days to backup 3terabytes of data. If you want any other configuration i can provide you.
Thank you for your help.

President
Top Expert 2010
Commented:
To eliminate the hardware, Boot a LINUX LiveCD (don't install the O/S, just boot the CD / ramdisk image).   Then simply do something like time tar cvf /dev/rmt/0mn /usr/*
This will copy everything in /usr directory to tape, and then you can get an idea how fast you can copy files.

Then also time dd if=/dev/zero of=/dev/rmt/0m bs=10k count=10000
Above will copy 10,000 x 10KB chunks worth of zeros to the tape.

Do all of the above and you will know what the tape is capable of. If performance is awful, look at the hardware.
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DavidPresident
Top Expert 2010

Commented:
(Sorry, if performance is awful, then look at the software)

Author

Commented:
But its not the software. I also tried the 30 day trial for the Backup exec and  that didn't even see my tape drive at all with all the drivers installed. So far i tried on 3 different software
1. novabackup
2. backup exec
3. backup utility built into windows
 
and in none of the drive didn't work as its suppose to.
Do you think it might be the hard ware issue?
I did ran hp storage work tools and it gave the status of the tape drive being good.
But when i ran to interal error i get one error says  "experincing pooling rate (1.0/sec ) on initiator ID 000000" -- (what does this error mean? what does pooling rate in tape drive? any idea?)
thank you
Check that you have the Adaptec card in a 4-lane PCI-e slot.

Copy a large file (like a DVD ISO image) to local disk then see how fast the  backup of that file goes at.
Top Expert 2014
Commented:
Test it with HP Library and Tape Tools - just go to www.hp.com/go/support - download drivers and software and type library and tape tools in the search box.
@gotspice - it could still be a 'software' issue, because all the software you're using is working via Windows. If you get the same results when running tests from a Linux boot CD, you will have eliminated one possibility - that it's a Windows driver problem.

Can we rewind slightly? I know it's an LTO5 so it can't be that old, but how old is the drive? It might be a tape issue - are you using LTO5 media? How many tapes have you tried? And have you run a cleaning tape?

Are you backing up 'local' data (ie, data on the tape host machine's own hard discs) or across a network? If the latter, the network might be the bottleneck.
@gotspice Because LTO-5 is a streaming tape drive it has a minimum write speed, which from memory is up in the 30MBytes/sec, below that it goes into what is know as shoe-shining mode (As your server writes into the drive cache, the tape sets off gets up to speed and starts writing to the tape, when the data in the cache runs out, the tape has to slow down to a stop, reverse back past the point it stopped writing (far enough to get back up to speed) gets back up to speed and starts writing at the point it left off and carries on until it runs out of data again.)

This normally occurs if your server cannot get the data off disk quick enough to write to the tape. What is the source that you are reading from? Is it RAID?

Author

Commented:
meyersd: I don't see a 4lane pci-e slot for my server to place my adaptec card in

andyalder: I am using the HP library tape tools and that is where i got the error "pooling 1.0/s"
It does say my drive is in good condition in the normal test.

Tape dude: I don't see why it is the software issue because i use 3 different software to try out the LTo5 tape drive in all of them the software either says cannot find or going very slow.
Also this tape drive was purchased about a month ago brand new, i bought 2 brand new cards to see if the tape can work on any of them. I cannot return the item until i get a bad drive on the ho library tape tools. I am first trying to backup local data of 2 tera bytes and it says wait time 10+ days.

connollyg: I am using a adaptec SAS 1045 interface card currently to do my backups. I am just tryign to backup data on the local c and d and f drive which has about 2 terabytes overall.

The SAS card you have the tape connected too is a consideration but if it is working OK then the speed you can read data off of disk is the real reason for shoe-shining.

In the Compaq days the Tape people in Houston came up with a rule of thumb that said you need to write to the drive (ie read off disk) at 3x the speed you expect the drive to write to the tape.

So what constitutes your c:, d: & f: drives? are they single disks, partitions on the same single disk, on RAID or what? The details are important.
DavidPresident
Top Expert 2010

Commented:
You are in a windows environment, you need to use a different O/S that uses different drivers .   Tape I/O is pretty simple.   An app reads from disk, writes to tape.  By going to LINUS, you can read from the bit bucket & stream to tape. If you get the slow speed, it confirms it is hardware.

DavidPresident
Top Expert 2010
Commented:
But with that RAID config of yours, likely problem is that the bottleneck is the RAID5.  You have rather low-end hardware, and your NTFS & RAID5 block sizes are not optimized for tape throughput.   Take my advice and the advice of tape dude. boot the system to LINUX and eliminate something.   Yes, it is a pain, but if you are not going to take advice of experts, then why bother asking the question in the first place?

Author

Commented:
Thank You for your advise.
Unforturnately I cannot boot the system into Linux.
I thought it would be easy to do a backup to a tape drive.

Author

Commented:
need to resolve the problem in windows only.
Doing a backup to a tape drive should be easy. but we can't help if you do not give us the information to help us diagnose your problem.

WE have already suggested reasons why your backup might be slow but without some detail from you its hard to take it further. Tell us more about your config?

Author

Commented:
connollyg: The c, d, and f, drives are all seperate scsi drives.
Top Expert 2014

Commented:
L&TT isn't just for testing the tape drive, you can test the read and write speed of your disk subsystem with it too.
DavidPresident
Top Expert 2010

Commented:
But you can not do a good test of tape drive if the data is coming from  a RAID.  AGain, boot the LIVECD (which i do not understand why you can't do this, it boots a ramdisk, not installs the os)

But use it to generate "files" from ram, so there will be no delays reading from disk,  the data that gets copied will be from /dev/zero, i.e, generated from the CPU, so you will have no read delays.  

Author

Commented:
the server is coorporate server. It takes at least 30 min to boot down and 30min to boot it back up.
200 employees from my company use this server.
All my companys data as well as roaming profiles are stored on this server.
I think you understand why i can't let the system be down for more then 1 hour.

I did do the read and write test
it transfered 4gb data in about 2min.

here is more info from the H&TT
Firmware Revision Z3ED
SCSI port #: 3/0

Also the RAID option on the interface card is turned off.
DavidPresident
Top Expert 2010

Commented:
200 employees on this server?  The problem isn't the tape drive. Your problem is disk I/O.  You may be able to throw some more RAM at it, or get some SSDs as a storage pool, but that still won't improve the time it takes data to get on/off your mechanical drives with 200 people using the box.

@gotspice You closed this question too early, but your problem really looks like it is shoe-shining of the tape because your server cannot get the data off disk quick enough.

Individual SCSI drives will not give you enough i/o performance to keep the tape-drive cache full.
Top Expert 2014

Commented:
I hate roaming profiles, takes me half an hour to login again if my work PC crashes.

How about uploading the L&TT report as an attachment? We often see problems even if the general consensus in the summary is a good drive.

Author

Commented:
I did upload the report.


SKMBT-363-I11081013200.tif

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