are
the 2 mount points on two different LUNs or just two points on the sme
LUN?
if
different LUNs are they the same RAID group?
same
type of disk for both? (SATA vs FC?)
how
are you connected to disk? dual port HBA one 2gb port per
disk mount?
or are
you using something like EMC Powerpath or HDS HDLM and only using one port, with
the other as failover, or both load balanced, or one port per
LUN?
Do you
have any other LUNs mounted via on of the ports?
You
say the tape drives are connected to a single card, but are they daisy
chained to one port on the card or is it a dual port/controller
SCSI card?
In
other words, more infor please
--
-----Original Message-----
From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED]
Sent: May 4, 2006 5:07 PM
To: veritas-bu@mailman.eng.auburn.edu
Subject: [Veritas-bu] 2Gb/s FC read speed
Hi,
I'm getting slow DSSU -> LTO2 tape drive performance. I think the problem is related to the SAN since the DSSU uses two mount points(/dssu1 and /dssu2).
I'm seeing 16MB/s on one LTO2 drive and 27MB/s on the other LTO2 tape drive using iostat. Both drives are LVD connected to the same card but using a different port.
Under ideal circumstances, how fast should i be able to read data off a dual port 2Gb/s hba assuming it's directly connected to the storage?
Karl-Frédéric Rossing, Technical Services phone: 204-786-6431 fax: 204-784-6755 toll free: 1-800-665-1934 www.federated.ca
CONFIDENTIALITY NOTICE
The information in this email may be confidential and/or legally privileged. This email is intended to be reviewed by only the individual(s) or organization(s) named above. If you are not the intended recipient or an authorized representative of the intended recipient, you are hereby notified that any review, dissemination or copying of this email and its attachments, if any, or the information contained herein is prohibited. If you have received this email in error, please immediately notify the sender by return email and delete this email and its attachments from your system. Thank you.
====================================================================================
La version française suit le texte anglais. ------------------------------------------------------------------------------------ This email may contain privileged and/or confidential information, and the Bank of Canada does not waive any related rights. Any distribution, use, or copying of this email or the information it contains by other than the intended recipient is unauthorized. If you received this email in error please delete it immediately from your system and notify the sender promptly by email that you have done so. ------------------------------------------------------------------------------------ Le présent courriel peut contenir de l'information privilégiée ou confidentielle. La Banque du Canada ne renonce pas aux droits qui s'y rapportent. Toute diffusion, utilisation ou copie de ce courriel ou des renseignements qu'il contient par une personne autre que le ou les destinataires désignés est interdite. Si vous recevez ce courriel par erreur, veuillez le supprimer immédiatement et envoyer sans délai à l'expéditeur un message électronique pour l'aviser que vous avez éliminé de votre ordinateur toute copie du courriel reçu.
