Date: Tue, 03 Feb 2004 05:08:15 -0800 From: Cy Schubert <Cy.Schubert@komquats.com> To: Putinas Piliponis <putinas.piliponis@icnspot.net> Cc: freebsd-current@freebsd.org Subject: Re: atacontrol rebuild and iostat Message-ID: <200402031308.i13D8F8F022178@cwsys.cwsent.com> In-Reply-To: Your message of "Tue, 03 Feb 2004 03:23:12 %2B0200." <04cf01c3ea3f$56394960$0464a8c0@spotripoli.local>
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(Silly me, my first attempt didn't cc the list, sorry.) In message <04cf01c3ea3f$56394960$0464a8c0@spotripoli.local>, "Putinas Piliponis" writes: > Hmm, another notice... > I created array, right now it's rebuilding > > atacontrol status ar0 > ar0: ATA RAID1 subdisks: ad4 ad6 status: REBUILDING 3% completed > > to check is it really doing what I expect I run > iostat ad4 ad6 1 > and I see 0 transfer to devices: > pilkis@freebsd:/usr/src# iostat ad4 ad6 1 > tty ad4 ad6 cpu > tin tout KB/t tps MB/s KB/t tps MB/s us ni sy in id > 1 1219 0.50 0 0.00 0.50 0 0.00 17 0 6 1 76 > 0 180 0.00 0 0.00 0.00 0 0.00 0 0 2 3 96 > 0 60 0.00 0 0.00 0.00 0 0.00 0 0 2 2 97 > 0 60 0.00 0 0.00 0.00 0 0.00 0 0 2 2 95 > 0 60 0.00 0 0.00 0.00 0 0.00 0 0 0 0 99 > 0 60 0.00 0 0.00 0.00 0 0.00 1 0 1 2 96 > > to be sure what I didn't miss something I also run > iostat ar0 > also no transfers 0.00MB/s > > Why nothing ? Iostat doesn't see the I/Os because RAID rebuilds occur within the controller, the I/Os are not initiated in the O/S nor any of its utilities, therefore the FreeBSDS kernel doesn't see them. The O/S doesn't see the I/Os. Atacontrol see 3% because it specifically queries the controller for that information. This is true of all hardware RAID controllers and true of all operating systems. Cheers, -- Cy Schubert <Cy.Schubert@komquats.com> http://www.komquats.com/ BC Government . FreeBSD UNIX Cy.Schubert@osg.gov.bc.ca . cy@FreeBSD.org http://www.gov.bc.ca/ . http://www.FreeBSD.org/
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