Veritas-bu

Re: [Veritas-bu] STK T10000 tape drive

2007-09-13 10:39:15
Subject: Re: [Veritas-bu] STK T10000 tape drive
From: Justin Piszcz <jpiszcz AT lucidpixels DOT com>
To: "Schaefer, Harry" <Harry.Schaefer AT turner DOT com>
Date: Thu, 13 Sep 2007 10:20:31 -0400 (EDT)

On Thu, 13 Sep 2007, Schaefer, Harry wrote:

> FWIW, I have done write tests with ours and based on output from iostat
> -xtc, the write speeds were between 100-105 mb/sec...
>
> Harry

But that is just the read speed of the hard drives yeah?  If the data
stream is compressed 2:1 the tape only writes then at 50-52.5 MiB/s.

I recall watching catalog backups write to tape and I would see the disk
reading at 100-120 MiB/s, was the LTO-2 tape that is was backing the
catalog up to writing that fast?  No, compression was being used.

Justin.

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