Date: Mon, 18 May 2015 18:27:04 +0200 (CEST) From: Wojciech Puchar <wojtek@puchar.net> To: Igor Mozolevsky <igor@hybrid-lab.co.uk> Cc: Hackers freeBSD <freebsd-hackers@freebsd.org> Subject: Re: Got seagate archive Was: Help with 8TB Seagate Archive Message-ID: <alpine.BSF.2.20.1505181824320.701@laptop.wojtek.intra> In-Reply-To: <CADWvR2gtmhVCuNXsdXAWxRaDs5NhXjNCrYxOTYRPohCa__PvAg@mail.gmail.com> References: <alpine.BSF.2.20.1504120004410.1075@laptop.wojtek.intra> <alpine.BSF.2.20.1505180034330.979@laptop.wojtek.intra> <CADWvR2gtmhVCuNXsdXAWxRaDs5NhXjNCrYxOTYRPohCa__PvAg@mail.gmail.com>
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> slows down. > > > > What sort of performance do you get when you use the drive as intended (i. e. tape-on-disk), either using tar or dd to raw device, > i. e. where the writes are always linear and not scattered? not tested purely linear writes, but writing large files result in slowdowns too. maybe smaller. Ask someone to test speed with dd if=/dev/zero of=/dev/seagate-archive bs=1m and check speed AFTER 20-30GB got written. in theory it should be fast. in theory there is no difference between theory and practice. In practice it is ;) Actually it should be OK if firmware is well written. In my opinion it is usable but not really well written.
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