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?
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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
- --
=============================================================
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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