Hello,My experience is that the larger the block size one uses the more prone
the drive is to errors especially when the drive is dirty. A number of years
ago I had the chance to speak to a Quantum tape expert and he recommended a max
of 500K -- at that time we were talking about an LTO-5. Since then tape
technology has improved significantly, but just the same at some point when
increasing the block size more errors will occur. I recommend testing various
block sizes to see what the performance gains really are as I suspect from my
own testing that performance increases quickly become minimal. Unless there
are some spectacular performance increases, I would not recommend block sizes
of more than 1-2 megabytes on LTO-6 and above and 1 megabyte max for LTO-5.Best
regards,KernSent from my Samsung Galaxy smartphone.
-------- Original message --------From: Steven Hammond <bcf1...@gmail.com>
Date: 3/13/20 15:55 (GMT+01:00) To: bacula-users@lists.sourceforge.net
Subject: Re: [Bacula-users] New tape drive Does anyone have recommendations for
MAXIMUM BLOCK SIZE for a LTO-7 tape drive (HP). We are currently using 2M on
the LTO-5 with success (and it seemed to improve the speed). I didn't know if
there was a better setting for the LTO-7 (e.g., 4M) that should be used. Any
suggestions?Steven HammondTechnical Chemical CompanyCleburne, TXOn 3/10/2020
12:38 PM, Gary R. Schmidt wrote:> On 11/03/2020 02:26, Steven Hammond wrote:>>
We are currently using a LTO-5 drive. We are upgrading to a LTO-7 >> drive. I
noticed the directive in our pools STORAGE=LTO-5. I'd like >> the existing
pools to use LTO-7 (since it can still read LTO-5 >> tapes). Can I just change
the directive in the pool to use our new >> LTO-7 tape drive OR will this mess
up the existing LTO-5 tapes in the >> pool. I was wanting to use the existing
pools, but I could create >> new ones if necessary. Thanks.>>> It's just a
tag, it has no meaning, you could use "Bilbo-Baggins" and > as long as you are
consistent it doesn't matter what the contents of > the "Storage" directive
is.>> Cheers,> Gary B-)>> P.S. It's considered impolite to
change the Subject of an existing > thread on a mailing list to start a new
discussion, it buggers up MUAs > that use the "Reference:" header to group
things.>>> _______________________________________________> Bacula-users
mailing list> Bacula-users@lists.sourceforge.net>
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