Date: Fri, 18 Jan 2013 19:28:48 -0800 From: Adrian Chadd <adrian@freebsd.org> To: Dieter BSD <dieterbsd@gmail.com> Cc: freebsd-hackers@freebsd.org, gibbs@freebsd.org, scottl@freebsd.org, mjacob@freebsd.org Subject: Re: IBM blade server abysmal disk write performances Message-ID: <CAJ-Vmok=dj8JYZ_1aXjGegFNj95WChn7Crrcs5JkvHrKJ6K7kA@mail.gmail.com> In-Reply-To: <CAA3ZYrB=gFjE3prhDmL-RUbpxNKtGCVMHR2j3iNKbd%2BzT4n9ZA@mail.gmail.com> References: <CAA3ZYrB=gFjE3prhDmL-RUbpxNKtGCVMHR2j3iNKbd%2BzT4n9ZA@mail.gmail.com>
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On 18 January 2013 19:11, Dieter BSD <dieterbsd@gmail.com> wrote: > Matthew writes: >> There is also no information in the original email as to which direction >> the I/O was being sent. > > In one of the followups, Karim reported: > # dd if=/dev/zero of=foo count=10 bs=1024000 > 10+0 records in > 10+0 records out > 10240000 bytes transferred in 19.615134 secs (522046 bytes/sec) > > 522 KB/s is pathetic. When this is running, use gstat and see exactly how many IOPS/sec there are and the average io size is. Yes, 522kbytes/sec is really pathetic, but there's a lot of potential reasons for that. adrian
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