From owner-freebsd-questions@freebsd.org Wed Dec 20 02:53:59 2017 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id EF1D5E8D6BC for ; Wed, 20 Dec 2017 02:53:59 +0000 (UTC) (envelope-from freebsd.ed.lists@sumeritec.com) Received: from mx6-out9.antispamcloud.com (mx6-out9.antispamcloud.com [95.211.2.200]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 962A57840A for ; Wed, 20 Dec 2017 02:53:59 +0000 (UTC) (envelope-from freebsd.ed.lists@sumeritec.com) Received: from [153.92.8.106] (helo=srv31.niagahoster.com) by mx12.antispamcloud.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eRUVw-0006VD-FY; Wed, 20 Dec 2017 03:53:50 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=sumeritec.com; s=default; h=Content-Transfer-Encoding:Content-Type: MIME-Version:References:In-Reply-To:Message-ID:Subject:Cc:To:From:Date:Sender :Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id:List-Help: List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=/DCzP+4vBE2O8/PoF4MVjFj8yIbSbY/8P+hA7AHK7XE=; b=dwzvtX2xirOUzsHcrayRGcC6GX sWCkGVVjODYfGEasuS8e0K0+kNOJTPfQwDQyqSdAbcgkXw2zq8GcfRwr1UXpbLspkiCQbvd2APnXy MLCDboDFN+aPxhFTDvcU4dHQmw1IQ3cWxfs7M0GjOIWs5MvD/edxoGPqCadRukySigNjq5T6mWf8G SoVmr1eQu4FcgD2dHhOwaUcgkDu7UFV48yqTsiPvp/oqrTqu463OtIVg4DXGPqHJqfOGu+XgW4yIc WjLRHDR3p4qeGQmzy+lspO6WJC7dyHWENe3LvbJLQ2vFRf/W6oogJQWUnGU+OYErsWDWazhnIUgzQ tZpj7Ucw==; Received: from [114.125.121.92] (port=52846 helo=X220.sumeritec.com) by srv31.niagahoster.com with esmtpsa (TLSv1.2:ECDHE-RSA-AES256-GCM-SHA384:256) (Exim 4.89) (envelope-from ) id 1eRUVD-0007Ki-51; Wed, 20 Dec 2017 09:53:03 +0700 Date: Wed, 20 Dec 2017 10:53:00 +0800 From: Erich Dollansky To: RW via freebsd-questions Cc: RW Subject: Re: hd firecuda Message-ID: <20171220105300.1497c3a9.freebsd.ed.lists@sumeritec.com> In-Reply-To: <20171219144606.0217ee55@gumby.homeunix.com> References: <1513447749.62024.1.camel@yandex.com> <20171217112428.150d8041.freebsd.ed.lists@sumeritec.com> <20171217111319.6a1af590@gumby.homeunix.com> <20171217194753.3ab59e6d.freebsd.ed.lists@sumeritec.com> <20171217150007.642efc20@gumby.homeunix.com> <20171218085219.2fec7c3b.freebsd.ed.lists@sumeritec.com> <20171218162625.5bcc543e@gumby.homeunix.com> <20171219081418.5672730b.freebsd.ed.lists@sumeritec.com> <20171219144606.0217ee55@gumby.homeunix.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-AuthUser: freebsd.ed.lists@sumeritec.com X-Originating-IP: 153.92.8.106 X-AntiSpamCloud-Domain: out.niagahoster.com X-AntiSpamCloud-Username: niaga Authentication-Results: antispamcloud.com; auth=pass (login) smtp.auth=niaga@out.niagahoster.com X-AntiSpamCloud-Outgoing-Class: unsure X-AntiSpamCloud-Outgoing-Evidence: Combined (0.11) X-Recommended-Action: accept X-Filter-ID: EX5BVjFpneJeBchSMxfU5hyKAmpOAywWnKgmsgsjY6Dj1g3/PwYZaTCzSym8uE9HvyegFAN3MVG+ 8Mu8M+ESLE+fzSH/OCabdgYrKxSFlmz0WCHdVL2O4JcuP9paLbvfuso5dtSdoXAUjjzTYPx/gefH zJ6mVE7ewsipSVIfs4Yp4ZO7cHKiK1QEoxZ1HWjp4JjiDSrbcmJ1QXhuh4fWds4AClmYiZ6wOVNy ZYWty2yZ3JKVmi72ocgY5kMQSjs7AS5g9nL+yeFiOR30+l159RWKPIghLmwGUyVWaXZBoLH7aulE 4UMGJwqy5VjVdI9fqrf2ZP1+Zwwo3b6lnMYL2gfMpdRpEyrH+JXw/8Q1obKu6Q7pqsrs1eY87KDr aNch07I5nQsJbJEtNb6LE8ahAUzYcflYKmOcgQfNhixzYT0//FPIxlmUiKdzJHAnWMbZkPduQ+ct q1dOZdSs1GX18F0pFDfWDhVSmolDSVBTw/xjDdT7p8MmjCBE2sIWqW1EV1Ni4VTTxl80eMD4aQuL GLV5sAoXPcEmVTxBegVjPD+tI4g+l6rCWbY0MZcgnbHsDPVWtcFrNvokDo6JQ0681tSXzqC/7IVp Tfw2ZOvaQhcvaqySszGEw+/0KcZ21l3rAH8WgFEDFV0anqG3QLhcBU4ypizDIoSI9NimOXTdLw7T PpuFqUUQz+mM8JAD4ECWfSiw4hQSSuVtgqBJ7QGUR/8gtlH3SZZE7bUqu+fwfPGfS6VMos18TJnB YzoMz7N0XovHDHmYbuSUgTtSXjeZ1NBj9qFTqW29+hVgN//VZRvJS7aysAufYrbzjGyYaYbJpRwN epoydEtjer9eettxrv1TduFgZxSMBhgPu8KHqEXRf2BFJSOt9mPgLKpjcST0ZJ0Q4x+0GOxZvoEN DONKwcABRoKlYnOoj/Sdd/c8yLR5T2Cy09huISk1GIHBjqQv7pMUGEd7KUcuVEcOwnlEQQ== X-Report-Abuse-To: spam@quarantine1.antispamcloud.com X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.25 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Dec 2017 02:54:00 -0000 Hi, On Tue, 19 Dec 2017 14:46:06 +0000 RW via freebsd-questions wrote: > On Tue, 19 Dec 2017 08:14:18 +0800 > Erich Dollansky wrote: > > > The drives can now use a reserved space of the disk to store the > > data. On long writes, this space will also be filled. > > It's unlikely that it would fall back to discarding useful cache in > the SSD *after* filling the larger non-shingled area of the drive. If > that bit of extra buffering made a useful difference they'd just > increase the size of the non-shingled area. how to increase the non-shingled area without shrinking the drive's available size? > > > It could be also that > > the disk fills first SSD and then the reserved space. > > If that happened I'd expect the speed to first drop to an intermediate > speed of 50-100 MB/s, where the the non-shingled area is being written > to, and then drop again when the non-shingled area fills. > > IMO what you are seeing is consistent with selective read caching plus > write caching into the non-shingled area. How do you explain then the deep breath? What do I call a deep breath? An access which takes more than a minute. It only happens when huge amounts of data is written to the drive like updating sources and ports tree and then starting to compile them. I first thought that the first drive is faulty. But the second shows the same behaviour. Since these things are finished, the drive behaves basically like an SSD. Erich > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org"