[ale] Disk performance

[Calvin Harrigan]

Try hdparm -Tt /dev/sda and see what you get . It does a read transfer test.
On Aug 24, 2013 5:39 PM, "Alex Carver" <agcarver+ale at acarver.net> wrote:

> I started revisiting some of the performance issues with one of my systems
> (slow startup of any program) and removing anything that may have
> interfered (HAL, fuse, etc., removing atime) so now I'm down to basic disk
> access.  Using iotop, it seems the disk is running slower than I recall
> (transfer rates of about 200 K/s).
>
> I'd appreciate any suggestions on areas to look short of a wipe and reload
> (I don't currently have spare drives) but any other performance checks and
> tweaks would be good.  It had been working fine for a long time and only
> recently has had any issues.
>
> I do have hdparm installed and there are two disks in the system both on
> the primary IDE channel.
>
> The report from hdparm:
>
> /dev/sda:
>
>  Model=Maxtor 90840D6, FwRev=WAS8283C, SerialNo=K60A721A
>  Config={ Fixed }
>  RawCHS=16276/16/63, TrkSize=0, SectSize=0, ECCbytes=29
>  BuffType=DualPortCache, BuffSize=256kB, MaxMultSect=16, MultSect=16
>  CurCHS=16276/16/63, CurSects=16406208, LBA=yes, LBAsects=16406208
>  IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
>  PIO modes:  pio0 pio1 pio2 pio3 pio4
>  DMA modes:  mdma0 mdma1 mdma2
>  UDMA modes: udma0 udma1 *udma2
>  AdvancedPM=no WriteCache=enabled
>  Drive conforms to: ATA/ATAPI-4 T13 1153D revision 17:  ATA/ATAPI-1,2,3,4
>
> ATA device, with non-removable media
>         Model Number:       Maxtor 90840D6
>         Serial Number:      K60A721A
>         Firmware Revision:  WAS8283C
> Standards:
>         Used: ATA/ATAPI-4 T13 1153D revision 17
>         Supported: 4 3 2
> Configuration:
>         Logical         max     current
>         cylinders       16276   16276
>         heads           16      16
>         sectors/track   63      63
>         --
>         CHS current addressable sectors:   16406208
>         LBA    user addressable sectors:   16406208
>         Logical/Physical Sector size:           512 bytes
>         device size with M = 1024*1024:        8010 MBytes
>         device size with M = 1000*1000:        8399 MBytes (8 GB)
>         cache/buffer size  = 256 KBytes (type=DualPortCache)
> Capabilities:
>         LBA, IORDY(can be disabled)
>         bytes avail on r/w long: 29
>         Standby timer values: spec'd by Standard
>         R/W multiple sector transfer: Max = 16  Current = 16
>         DMA: mdma0 mdma1 mdma2 udma0 udma1 *udma2
>              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
>            *    Power Management feature set
>            *    Write cache
>            *    Look-ahead
>            *    Host Protected Area feature set
>            *    WRITE_VERIFY command
>            *    WRITE_BUFFER command
>            *    READ_BUFFER command
>            *    NOP cmd
>            *    DOWNLOAD_MICROCODE
>
>
>  * signifies the current active mode
>
>  multcount     = 16 (on)
>  IO_support    =  0 (default)
>  readonly      =  0 (off)
>  readahead     = 256 (on)
>  geometry      = 1021/255/63, sectors = 16406208, start = 0
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