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LTO tape for 7017-S70 1
- Thread starter malki
- Start date
I have an IBM model and a Qualstar library.
Consider this. It is "4th quarter". IBM loves to make deals on purchases in the "4th quarter". IBM actually out-priced another vendor recently which is why we went with the IBM LTO drive.
Look at
Regards, Bill.
Consider this. It is "4th quarter". IBM loves to make deals on purchases in the "4th quarter". IBM actually out-priced another vendor recently which is why we went with the IBM LTO drive.
Look at
Regards, Bill.
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- #3
Hi malki. I think you asked which model to buy, not which brand. With regards to the IBM LTO models you have a few choices.
Which physical connection style to use - either HVD or LVD. I believe that HVD has a theoretical limit of 40MB/sec and LVD 80MB/sec. HVD uses a 5V signal and can accomodate up to a 25 meter cable, whereas LVD uses 3.3V and only allows about a 10 meter cable length. It's kind of a moot point if the LTO is the only device on the interface since it's native speed is about 15MB/sec (30MB with compression).
You then must decide whether you want a single drive, small autoloader, small library or -very- big library. The 3580 is a single drive/single tape unit. The 3581 is a 7 tape/single drive autoloader. The 3583 and 3584 are libraries.
I understand that the tapes might be different in the big library. In the 3580 and 3581 the 'Ultrium' tapes are 100GB native/200GB compressed.
We use 3581-H17s (HVD) on F30s and F50s (using the old FW/Diff 2409 and 6209 cards) and average about 4-5MB/second. We also use the 3581-H17s on a pair of P660/6H1s and average about 13-15MB/second on those systems. That's approaching 1GB/minute. I can live with that.
I hope this helps.
Geoff Goldman
Which physical connection style to use - either HVD or LVD. I believe that HVD has a theoretical limit of 40MB/sec and LVD 80MB/sec. HVD uses a 5V signal and can accomodate up to a 25 meter cable, whereas LVD uses 3.3V and only allows about a 10 meter cable length. It's kind of a moot point if the LTO is the only device on the interface since it's native speed is about 15MB/sec (30MB with compression).
You then must decide whether you want a single drive, small autoloader, small library or -very- big library. The 3580 is a single drive/single tape unit. The 3581 is a 7 tape/single drive autoloader. The 3583 and 3584 are libraries.
I understand that the tapes might be different in the big library. In the 3580 and 3581 the 'Ultrium' tapes are 100GB native/200GB compressed.
We use 3581-H17s (HVD) on F30s and F50s (using the old FW/Diff 2409 and 6209 cards) and average about 4-5MB/second. We also use the 3581-H17s on a pair of P660/6H1s and average about 13-15MB/second on those systems. That's approaching 1GB/minute. I can live with that.
I hope this helps.
Geoff Goldman
I have a Qualstar library (11 tapes, 1 LTO Ultrium drive) and an IBM LTO drive. The IBM drive is connected to our S80, and see's around 19MB/second on backups. The Qualstar is on an F50 and see's around 15MB/sec.
Both work well. Both are LVD/SE. The 6205 Ultra-2 2-channel adapter is what we have.
Bill.
Both work well. Both are LVD/SE. The 6205 Ultra-2 2-channel adapter is what we have.
Bill.
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