Difference between revisions of "Devices and storage"
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== block devices in Linux== | == block devices in Linux== | ||
=== I/O analisys === | === I/O analisys === | ||
* vmstat | * vmstat | ||
* iostat | * iostat | ||
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** CONFIG_TASK_DELAY_ACCT: is not set when it should be. | ** CONFIG_TASK_DELAY_ACCT: is not set when it should be. | ||
** CONFIG_TASKSTATS: is not set when it should be. | ** CONFIG_TASKSTATS: is not set when it should be. | ||
=== udev === | === udev === | ||
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/dev/sda: WDC WD3200KS-00PFB0: 42 C or F | /dev/sda: WDC WD3200KS-00PFB0: 42 C or F | ||
==== | ==== extend hddtemp database ==== | ||
* file '''/usr/share/hddtemp/hddtemp.db''' | |||
"ST3320620AS" 194 C "Seagate ST3320620AS" | "ST3320620AS" 194 C "Seagate ST3320620AS" | ||
"WDC WD3200KS-00PFB0" 194 C "Western Digital WD3200KS-00PFB0" | "WDC WD3200KS-00PFB0" 194 C "Western Digital WD3200KS-00PFB0" |
Revision as of 19:13, 14 April 2011
block devices in Linux
I/O analisys
- vmstat
- iostat
- vopstat
- sysstat (package)
- iotop
- kernel "unusual" options needed
- CONFIG_TASK_IO_ACCOUNTING: is not set when it should be.
- CONFIG_TASK_DELAY_ACCT: is not set when it should be.
- CONFIG_TASKSTATS: is not set when it should be.
udev
- udev manages the /dev filesystem interacting with the kernel and its modules
- disk conncted through udev
ls -lR /dev/disk
- udev information dump
udevinfo -a -p /sys/block/sdb/
hdparm
- sets and gets information from a block device
- hdparm -I /dev/hda
/dev/hda:
ATA device, with non-removable media Model Number: WDC WD2500JB-00FUA0 Serial Number: WD-WCAEP1091941 Firmware Revision: 15.05R15 Standards: Supported: 6 5 4 Likely used: 6 Configuration: Logical max current cylinders 16383 65535 heads 16 1 sectors/track 63 63 -- CHS current addressable sectors: 4128705 LBA user addressable sectors: 268435455 LBA48 user addressable sectors: 488397168 device size with M = 1024*1024: 238475 MBytes device size with M = 1000*1000: 250059 MBytes (250 GB) Capabilities: LBA, IORDY(can be disabled) Standby timer values: spec'd by Standard, with device specific minimum R/W multiple sector transfer: Max = 16 Current = 16 Recommended acoustic management value: 128, current value: 128 DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5 Cycle time: min=120ns recommended=120ns PIO: pio0 pio1 pio2 pio3 pio4 Cycle time: no flow control=120ns IORDY flow control=120ns Commands/features: Enabled Supported: * SMART feature set Security Mode feature set * Power Management feature set * Write cache * Look-ahead * Host Protected Area feature set * WRITE_BUFFER command * READ_BUFFER command * DOWNLOAD_MICROCODE SET_MAX security extension * Automatic Acoustic Management feature set * 48-bit Address feature set * Device Configuration Overlay feature set * Mandatory FLUSH_CACHE * FLUSH_CACHE_EXT * SMART error logging * SMART self-test Security: supported not enabled not locked not frozen not expired: security count not supported: enhanced erase HW reset results: CBLID- above Vih Device num = 0 determined by the jumper Checksum: correct
Hard disk naming
- behind the hard disks naming, as WD3200JD, there's lot of info about the device:
http://forums.storagereview.net/index.php?showtopic=22131 Sample: WD3200JD-00KLB0 Formula: AAbbbbCD-eeFGHi
AA = WesternDigital
bbbb = Capacity in 100MB units (GBx10)
C = Cache(buffer) size and drive's purpose: * Desktop drives: B=2MB, J=8MB, K=16MB * Enterprise drives 7200rpm: S=8MB, Y=16MB * Enterprise drives 10000rpm: G=8MB, A=16MB
D = Interface and some other specs: * B=ATA, D=SATA150, S=SATA300, R=SATA150(RaidEdition2), H=SATA150(Window)
ee = Vendor code (probably): * 00=general consumers, 01=general enterprise, 22=promotional(?), * 07/08/11/14/23/32/40/41/50/55/56/57/58/60/75/88/98=unknown (of them 55 is pretty much used)
F = May be related to platters (needs more research)
G = ??? (needs more research)
H = Related to interface/firmware and something more (needs more research): * A=ATA(Caviar over 100GB)/ATAandSATA(Caviar below 100GB), B=SATA(Caviar over 100GB), C=ATAandSATA(Caviar, newer updates), A/C/R=Generation(RaptorSATA), T=LaptopDrive
i = Firmware version (probably): * 0/1/2=larger is newer (if the preceeding letter is same).
Disktype
disktype /dev/sda --- /dev/hda Block device, size 372.6 GiB (400088457216 bytes) DOS/MBR partition map Partition 1: 372.6 GiB (400085812224 bytes, 781417602 sectors from 63, bootable) Type 0x83 (Linux) ReiserFS file system (new 3.6 format, standard journal, starts at 64 KiB) Volume name "scratch" UUID E217E2D5-0410-479E-B4C7-60116C56761E (DCE, v4) Volume size 372.6 GiB (400085811200 bytes, 97677200 blocks of 4 KiB) [...]
Hddtemp
# hddtemp /dev/sd[abcd] WARNING: Drive /dev/sda doesn't appear in the database of supported drives WARNING: But using a common value, it reports something. WARNING: Note that the temperature shown could be wrong. WARNING: See --help, --debug and --drivebase options. WARNING: And don't forget you can add your drive to hddtemp.db /dev/sda: WDC WD3200KS-00PFB0: 42 C or F
extend hddtemp database
* file /usr/share/hddtemp/hddtemp.db "ST3320620AS" 194 C "Seagate ST3320620AS" "WDC WD3200KS-00PFB0" 194 C "Western Digital WD3200KS-00PFB0"
- risultato
# hddtemp /dev/sd[abcd] /dev/sda: WDC WD3200KS-00PFB0: 42 C /dev/sdb: ST3750330AS: 36 C /dev/sdc: WDC WD3200KS-00PFB0: 41 C /dev/sdd: ST3750330AS: 41 C