From: Martin Mokrejs <mmokrejs@fold.natur.cuni.cz>
To: Daniel Pocock <daniel@pocock.com.au>
Cc: linux-ide@vger.kernel.org
Subject: Re: very slow write to AHCI device
Date: Mon, 07 May 2012 20:27:18 +0200 [thread overview]
Message-ID: <4FA81406.5010806@fold.natur.cuni.cz> (raw)
In-Reply-To: <4FA81067.80607@pocock.com.au>
Daniel Pocock wrote:
> On 07/05/12 20:10, Martin Mokrejs wrote:
>> Hi Daniel,
>>
>> Daniel Pocock wrote:
>>
>>>
>>> Hi,
>>>
>>> I'm testing a problem with the following combination:
>>> - SB700/SB800 type controller in AHCI mode (in a HP Microserver N36L)
>>> - Seagate Barracuda 1TB 7k2 drive with NCQ
>>>
>> Is that a disk with 4k hardware sectors (Advanced Format)? Where does
>> you partition start? At sector 63 or 2048? ;-)
>>
>>
> At 2048:
So you you safe if it would be 4k sector drive.
>
> Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
> 255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
> Units = sectors of 1 * 512 = 512 bytes
> Sector size (logical/physical): 512 bytes / 512 bytes
> I/O size (minimum/optimal): 512 bytes / 512 bytes
> Disk identifier: 0x484d5754
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 * 2048 499711 248832 83 Linux
> Partition 1 does not end on cylinder boundary.
> /dev/sdb2 499712 1953523711 976512000 fd Linux raid
> autodetect
I caught myself:
# lsscsi
[0:0:0:0] disk ATA ST380815AS 3.AA /dev/sda
[1:0:0:0] disk ATA WDC WD2502ABYS-0 02.0 /dev/sdb
[2:0:0:0] disk ATA WDC WD1000FYPS-0 02.0 /dev/sdc
[3:0:0:0] disk ATA WDC WD1000FYPS-0 02.0 /dev/sdd
[4:0:0:0] disk ATA WDC WD1000FYPS-0 02.0 /dev/sde
[5:0:0:0] disk ATA WDC WD1000FYPS-0 02.0 /dev/sdf
# fdisk /dev/sdc
Command (m for help): p
Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0xe997c4dd
Device Boot Start End Blocks Id System
/dev/sdc1 63 1953520064 976760001 fd Linux raid autodetect
Command (m for help): q
# smartctl -a /dev/sdc
smartctl 5.42 2011-10-20 r3458 [x86_64-linux-3.3.2-default] (local build)
Copyright (C) 2002-11 by Bruce Allen, http://smartmontools.sourceforge.net
=== START OF INFORMATION SECTION ===
Model Family: Western Digital RE2-GP
Device Model: WDC WD1000FYPS-01ZKB0
Serial Number: WD-WCASJ1253793
LU WWN Device Id: 5 0014ee 256812a2d
Firmware Version: 02.01B01
User Capacity: 1,000,204,886,016 bytes [1.00 TB]
Sector Size: 512 bytes logical/physical
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: Mon May 7 20:21:35 2012 MEST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
[cut]
Do you have same model?
My disk catch up at 3Gbps:
ata3: SATA link up 3.0 Gbps (SStatus 123 SControl 300)
ata3.00: ATA-8: WDC WD1000FYPS-01ZKB0, 02.01B01, max UDMA/133
ata3.00: 1953525168 sectors, multi 0: LBA48 NCQ (depth 31/32), AA
ata3.00: configured for UDMA/133
scsi 2:0:0:0: Direct-Access ATA WDC WD1000FYPS-0 02.0 PQ: 0 ANSI: 5
sd 2:0:0:0: [sdc] 1953525168 512-byte logical blocks: (1.00 TB/931 GiB)
sd 2:0:0:0: Attached scsi generic sg2 type 0
sd 2:0:0:0: [sdc] Write Protect is off
sd 2:0:0:0: [sdc] Mode Sense: 00 3a 00 00
sd 2:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
sdc: sdc1
sd 2:0:0:0: [sdc] Attached SCSI disk
Martin
next prev parent reply other threads:[~2012-05-07 18:24 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-05-07 16:16 very slow write to AHCI device Daniel Pocock
2012-05-07 18:10 ` Martin Mokrejs
2012-05-07 18:11 ` Daniel Pocock
2012-05-07 18:27 ` Martin Mokrejs [this message]
2012-05-07 23:30 ` Daniel Pocock
2012-05-08 8:21 ` Martin Mokrejs
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