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The native compression of AIT-4 is 200 gb, so this is really weird.
I'd be staisfied with
190 GB. We were getting that at the start.
~ mht
Werth, Dave wrote:
| Matt,
|
| We installed AIT-4 tapes about 2 months ago and in looking at the
| tapes that are full it looks like we're averaging around 190 GB per
| tape (it varies from 136 GB to 208 GB) with software compression.
| What you're seeing is about half of that so is it possible you
| don't have compression turned on? I think the native capacity of
| AIT-4 is 100 GB so that would make sense.
|
| Dave
|
| David Werth Garmin AT, Inc Salem, Oregon dave.werth AT garmin DOT com
|
| -----Original Message----- From: Matt Temple
| [mailto:mht AT RESEARCH.DFCI.HARVARD DOT EDU] Sent: Friday, November 18,
| 2005 3:44 PM To: NETWORKER AT LISTSERV.TEMPLE DOT EDU Subject: [Networker]
| 80 GB on AIT-4 tapes?
|
|
|
| ------------------------- This e-mail and any attachments may
| contain confidential material for the sole use of the intended
| recipient. If you are not the intended recipient, please be aware
| that any disclosure, copying, distribution or use of this e-mail or
| any attachment is prohibited. If you have received this e-mail in
| error, please contact the sender and delete all copies. Thank you
| for your cooperation
|
|
| All,
|
| ~ Anyone have any idea why we might be getting about 80 gb
| on our AIT-4 tapes. Consistently 80, 85, 87, etc.
|
| ~ On the thought it might be a particular scsi card and
| driver, I replaced our adaptec card with an LSI-logic one. No
| difference.
|
| ~ Does anyone have any settings for stinit.def for AIT-4,
| or do you use the same as AIT-3? Block sizes?
|
| ~ (By the way -- this is a storage node, we've run it both
| with RH9 and Fedora Core 1 with no differences in behavior.). To
| make matters stranger, we were getting higher density when we first
| got the drives this May.)
|
| ~ Kernel is 2.4.21.2199.5ntlsmp; 4 gb RAM; we're using a
| tape blocksize of 192K as we do with the AIT-3 drives.
|
| ~ By the way -- Networker 7.1.3. Our machine and drives:
|
|
| | Host: scsi2 Channel: 00 Id: 00 Lun: 00 Vendor: QUALSTAR Model: |
| TLS-46120 Rev: 224b Type: Medium Changer | ANSI SCSI
| revision: 02 Host: scsi2 Channel: 00 Id: 01 Lun: 00 | Vendor: SONY
| Model: SDX-900V Rev: 0102 Type: | Sequential-Access
| ANSI SCSI revision: 03 Host: scsi2 | Channel: 00 Id: 02 Lun: 00
| Vendor: SONY Model: SDX-900V | Rev: 0102 Type:
| Sequential-Access ANSI SCSI | revision: 03 Host:
| scsi3 Channel: 00 Id: 03 Lun: 00 Vendor: SONY | Model: SDX-900V
| Rev: 0102 Type: Sequential-Access | ANSI SCSI revision: 03
|
|
|
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- --
=============================================================
Matthew Temple Tel: 617/632-2597
Director, Research Computing Fax: 617/582-7820
Dana-Farber Cancer Institute mht AT research.dfci.harvard DOT edu
44 Binney Street, LG300/300 http://research.dfci.harvard.edu
Boston, MA 02115 Choice is the Choice!
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