From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Thomas C. Bishop" Subject: Re: raid5 messed up Date: Thu, 7 Sep 2017 10:40:07 -0500 Message-ID: <7f4bfb83-cb9c-aa50-5cb7-23cfd7da3e45@email.latech.edu> References: <42b3f75a-d93d-f20d-579b-901a305fb508@email.latech.edu> <59B09036.1040600@youngman.org.uk> <6e5083a4-609b-daba-3326-0dbd9dda6c34@email.latech.edu> <59B165ED.406@youngman.org.uk> Reply-To: bishop@latech.edu Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <59B165ED.406@youngman.org.uk> Content-Language: en-US Sender: linux-raid-owner@vger.kernel.org To: Wols Lists , bishop@latech.edu, linux-raid@vger.kernel.org List-Id: linux-raid.ids I have servers configured w/ HW controlled raid and have had virtually NO problems w/ those. Both my backup machines are SW raid... I've had to replace multiple drives on the SW configured raid. The drives are either SAME MODEL or same Seagate drive family in all cases and one server is actually the same SuperMicro model as one of the desktops. I had attributed this to just a hotter running environment.. the backup machines are desktop workstations w/ NVIDIA graphics cards that run pretty hot, but I'm rethinking this now. Any chance SW raid is running the HDs harder/hotter than the HW raid? All machines run 24-7-365 so power cycling is not the issue and the server room is not necessarily cooler than the office/desktop environment. Tom On 09/07/2017 10:29 AM, Wols Lists wrote: > On 07/09/17 14:33, Thomas C. Bishop wrote: >> I see what you mean... seems it would be simple enough to find this >> spec. but not clear if supported or not. >> Seagate claims this is a "best fit applications" drive for High-Capacity >> RAID storage but never lists ERC as feature. >> http://www.seagate.com/files/www-content/partners/my%20spp%20dashboard/learn/en-us/docs/storage-solutions-guide-jul-2013-ssg1351-13-1307us.pdf >> >> pg 30 of the brochure. >> >> elsewhere@seagate I read ERC is a subset of the smart control commands >> which are supported on this drive so one _might_ think it's supported. >> >> FYI: smartctl --xall doesn't provide an answer either. >> closest it comes is >> SMART support is: Available - device has SMART capability. > My Barracudas explicitly say SMART is available (disabled by default on > power-up :-(, and ERC is not available. Yours mentions neither ERC, nor > the error timeout, so something's weird somewhere ... quite possibly the > drive can do it, but it's badly documented and the smartctl authors > don't know the magic incantation ... :-) > > Or, like the Barracudas have a long timeout hard encoded, possibly the > Constellations have a short timeout hard encoded. > > Cheers, > Wol > -- *********************************** Thomas C. Bishop Hazel Stewart Garner Associate Professor Chemistry & Physics Tel: 318-257-5209 Fax: 318-257-3823 www.latech.edu/~bishop ***********************************