From: Lukas Kolbe <lkolbe@techfak.uni-bielefeld.de>
To: Kai Makisara <Kai.Makisara@kolumbus.fi>
Cc: "Desai, Kashyap" <Kashyap.Desai@lsi.com>,
Boaz Harrosh <bharrosh@panasas.com>,
"linux-scsi@vger.kernel.org" <linux-scsi@vger.kernel.org>
Subject: RE: After memory pressure: can't read from tape anymore
Date: Sun, 05 Dec 2010 11:44:49 +0100 [thread overview]
Message-ID: <1291545889.2814.2882.camel@larosa> (raw)
In-Reply-To: <alpine.LNX.2.00.1012022215060.9213@kai.makisara.local>
Am Donnerstag, den 02.12.2010, 22:25 +0200 schrieb Kai Makisara:
> P.S. Why is it necessary to use 2 MB blocks? Some people say that it is
> the optimal block size for some current tape drives.
I really couldn't care less about blocksizes, but it seems to be that
it's impossible to reach high LTO4 write-speeds with lower blocksizes;
tests show that >100MiB/s are not possible with blocksizes around 64KB
to 512KB (from memory), so: the bigger the blocksize, the higher the
writing speed.
I suppose this gets even more critical with LTO5 drives.
--
Lukas
next prev parent reply other threads:[~2010-12-05 10:44 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-28 19:15 After memory pressure: can't read from tape anymore Lukas Kolbe
2010-11-29 17:09 ` Kai Makisara
2010-11-30 13:31 ` Lukas Kolbe
2010-11-30 16:10 ` Boaz Harrosh
2010-11-30 16:23 ` Kai Makisara
2010-11-30 16:44 ` Boaz Harrosh
2010-11-30 17:04 ` Kai Makisara
2010-11-30 17:24 ` Boaz Harrosh
2010-11-30 19:53 ` Kai Makisara
2010-12-01 9:40 ` Lukas Kolbe
2010-12-02 11:17 ` Desai, Kashyap
2010-12-02 16:22 ` Kai Makisara
2010-12-02 18:14 ` Desai, Kashyap
2010-12-02 20:25 ` Kai Makisara
2010-12-05 10:44 ` Lukas Kolbe [this message]
2010-12-03 10:13 ` FUJITA Tomonori
2010-12-03 10:45 ` Desai, Kashyap
2010-12-03 11:11 ` FUJITA Tomonori
2010-12-02 10:01 ` Lukas Kolbe
2010-12-03 9:44 ` FUJITA Tomonori
2010-11-30 16:20 ` Kai Makisara
2010-12-01 17:06 ` Lukas Kolbe
2010-12-02 16:41 ` Kai Makisara
2010-12-06 7:59 ` Kai Makisara
2010-12-06 8:50 ` FUJITA Tomonori
2010-12-06 9:36 ` Lukas Kolbe
2010-12-06 11:34 ` Bjørn Mork
2010-12-08 14:19 ` Lukas Kolbe
2010-12-03 12:27 ` FUJITA Tomonori
2010-12-03 14:59 ` Kai Mäkisara
2010-12-03 15:06 ` James Bottomley
2010-12-03 17:03 ` Lukas Kolbe
2010-12-03 18:10 ` James Bottomley
2010-12-05 10:53 ` Lukas Kolbe
2010-12-05 12:16 ` FUJITA Tomonori
2010-12-14 20:35 ` Vladislav Bolkhovitin
2010-12-14 22:23 ` Stephen Hemminger
2010-12-15 16:27 ` Vladislav Bolkhovitin
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