Veritas-bu

[Veritas-bu] Sizing of media by number of tape drives

2005-01-04 18:37:56
Subject: [Veritas-bu] Sizing of media by number of tape drives
From: jimh AT federaledge DOT com (Jim Horalek)
Date: Tue, 4 Jan 2005 15:37:56 -0800
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I was just look at some numbers from emulex compared to qlogic One hba =
can
write about 2880 write iops if doing tape and disk off the same hba. =
This
works out to about 47MB/s for each of 4 tape drives.(64k blocks)=20
Reads from  disk were substanially slower for the qlogic. Overall xfer =
was
350MB/s emulex vs 233MB/s for the qlogic. 2gb hba's

You can check me here to see if my math is wrong.
http://www.emulex.com/pdfs/compare_qlogic.pdf

Jim



-----Original Message-----
From: veritas-bu-admin AT mailman.eng.auburn DOT edu
[mailto:veritas-bu-admin AT mailman.eng.auburn DOT edu] On Behalf Of Alex Fong
Sent: Tuesday, January 04, 2005 9:35 AM
To: ida3248b AT post.cybercity DOT dk
Cc: veritas-bu AT mailman.eng.auburn DOT edu
Subject: Re: [Veritas-bu] Sizing of media by number of tape drives


The last time I had a Veritas Consultant came out to help upgrade =
NetBackup,
she recommend to put no more than 4 drives per HBA in our environment. =
If
you only have 1 HBA, you can still drive 8 drives but it might take a
performance hit (but it might still be an acceptable speed depends on =
your
environment and backup window).

Alex

On Tue, 4 Jan 2005 18:00:12 +0100, ida3248b AT post.cybercity DOT dk
<ida3248b AT post.cybercity DOT dk> wrote:
> Hello All
>=20
> I have tried to find a guide lines for sizing Solaris and AIX media
> servers by the number of attached tape drives.
>=20
> I have gotten a internal work document from Veritas but it dosn't
> contain the enterprise tape drives we are using (STK9840 and=20
> STK99940).
>=20
> We have 8 STK9940B drives that I want to get streaming.
>=20
> We have 2 AIX 5.2 Media servers and 1 Solaris Master/media server that
> shares these 8 tapes drives, but I would each media server to be able=20
> to stream all 8 drives.
>=20
> Does somebody on list have a set of guide lines ?
>=20
> or suggestions/ideas ?
>=20
> Regards
> Michael
>=20
> --
> Cybercity Webhosting (http://www.cybercity.dk)
>=20
> _______________________________________________
> Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
> http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
>
_______________________________________________
Veritas-bu maillist  -  Veritas-bu AT mailman.eng.auburn DOT edu
http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu

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