Date: Fri, 8 Jun 2018 14:42:52 +0300 From: Christos Chatzaras <chris@cretaforce.gr> To: FreeBSD <freebsd-questions@freebsd.org> Subject: Re: Toshiba disk low performance Message-ID: <18DD35BD-0DA5-4186-9633-F9270744F9AD@cretaforce.gr> In-Reply-To: <d9a93323-cb2c-d7eb-ed5d-657d162c0614@qeng-ho.org> References: <DC4343C3-AC15-427E-9653-4C6A7F4E34C4@cretaforce.gr> <20180607171933.6b4babd094f4d056da797cf5@sohara.org> <5D96200B-649B-4851-9FC6-F56F3188326B@cretaforce.gr> <d9a93323-cb2c-d7eb-ed5d-657d162c0614@qeng-ho.org>
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I did some benchmarks and the problem exist in both Linux and FreeBSD. I benchmark a server with Toshiba disks and a server with Seagate disks. First I install debian without RAID-1. Then I install iozone. Tests done with hdparm to test disk bandwidth and iozone to test random = read/writes. Here are the results: https://hastebin.com/gayidosaju.pas As you can see the bandwidth for the Toshiba disks is slower than = Seagate but this doesn't really matter. The problem is the second test that does random read/writes which show = the Toshiba has 10 times slower random write speed than the Seagate. That's why the issue happens mostly during a "mysql import" and not = other server tasks.
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