Date: Thu, 21 Oct 2010 22:32:54 +0000 From: Paul Wootton <paul@fletchermoorland.co.uk> To: =?UTF-8?B?RGFnLUVybGluZyBTbcO4cmdyYXY=?= <des@des.no> Cc: Bruce Cran <bruce@cran.org.uk>, freebsd-hackers@freebsd.org Subject: Re: Summary: Re: Spin down HDD after disk sync or before power off Message-ID: <4CC0BF96.1050806@fletchermoorland.co.uk> In-Reply-To: <864ocf7esp.fsf@ds4.des.no> References: <201009161742.24228.tijl@coosemans.org> <201009161619.o8GGJAmv035378@lurza.secnetix.de> <20101018155944.GA12425@freebsd.org> <868w1r92rf.fsf@ds4.des.no> <20101021122110.GA65490@freebsd.org> <86zku77mj6.fsf@ds4.des.no> <20101021135442.000054c9@unknown> <86vd4v7gx1.fsf@ds4.des.no> <20101021160335.00001c0a@unknown> <864ocf7esp.fsf@ds4.des.no>
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On 10/21/10 15:20, Dag-Erling Smørgrav wrote: > Bruce Cran<bruce@cran.org.uk> writes: >> The Ubuntu issue was what I was thinking of - I got that mixed up with >> the aggressive power management of the WD EARS drives. > The entire Green series, actually, which includes models such as the > EADS, AARS etc., but there's more to them than that - the central > feature is their dynamically adjusted rotational speed, which allows > them to conserve power without spinning all the way down. > > DES Actually, the green series does spin all the way down, well at least the drive I have does. Here is the output from one of my drives, that I do not think has long left to live. === START OF INFORMATION SECTION === Model Family: Western Digital Caviar Green family Device Model: WDC WD5000AADS-00M2B0 Serial Number: WD-WMAV51882791 Firmware Version: 01.00A01 User Capacity: 500,107,862,016 bytes Device is: In smartctl database [for details use: -P show] ATA Version is: 8 ATA Standard is: Exact ATA specification draft version not indicated Local Time is: Thu Oct 21 23:31:35 2010 BST SMART support is: Available - device has SMART capability. SMART support is: Enabled .... SMART Attributes Data Structure revision number: 16 Vendor Specific SMART Attributes with Thresholds: ID# ATTRIBUTE_NAME FLAG VALUE WORST THRESH TYPE UPDATED WHEN_FAILED RAW_VALUE 1 Raw_Read_Error_Rate 0x002f 200 200 051 Pre-fail Always - 0 3 Spin_Up_Time 0x0027 111 104 021 Pre-fail Always - 7425 4 Start_Stop_Count 0x0032 100 100 000 Old_age Always - 98 5 Reallocated_Sector_Ct 0x0033 200 200 140 Pre-fail Always - 0 7 Seek_Error_Rate 0x002e 100 253 000 Old_age Always - 0 9 Power_On_Hours 0x0032 093 093 000 Old_age Always - 5295 10 Spin_Retry_Count 0x0032 100 253 000 Old_age Always - 0 11 Calibration_Retry_Count 0x0032 100 253 000 Old_age Always - 0 12 Power_Cycle_Count 0x0032 100 100 000 Old_age Always - 96 192 Power-Off_Retract_Count 0x0032 200 200 000 Old_age Always - 95 193 Load_Cycle_Count 0x0032 001 001 000 Old_age Always - 781014 194 Temperature_Celsius 0x0022 120 102 000 Old_age Always - 27 196 Reallocated_Event_Count 0x0032 200 200 000 Old_age Always - 0 197 Current_Pending_Sector 0x0032 200 200 000 Old_age Always - 0 198 Offline_Uncorrectable 0x0030 200 200 000 Old_age Offline - 0 199 UDMA_CRC_Error_Count 0x0032 200 200 000 Old_age Always - 0 200 Multi_Zone_Error_Rate 0x0008 200 200 000 Old_age Offline - 0 The datasheet for these drive <http://www.wdc.com/wdproducts/library/SpecSheet/ENG/2879-701229.pdf>http://www.wdc.com/wdproducts/library/SpecSheet/ENG/2879-701229.pdf says "Reliability/Data Integrity Load/unload cycles (3) 300,000 Limited Warranty (years) (4) (3) Controlled unload at ambient condition (4) The term of the limited warranty my vary by region" Also http://wdc.custhelp.com/cgi-bin/wdc.cfg/php/enduser/std_adp.php?p_faqid=5357 "(drive has been validated to 1 million load/unload cycles without issue)" Im already at 781014 load cycles, yet the drive is only about 7 months old. Doing the math, I am getting a load/unload cycle about every 24.5 seconds Another 2 months and I will be knocking on for 1 million load/unload cycles.... As DES has already said, for most people the extra load/unload cycles when rebooting a computer will not be an issue at all and is far more desirable than an emergency park when powering down Paul
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