[vdr] Re: Buffer overflows

[Jan Ekholm <chakie@infa.abo.fi>]

On Fri, 26 Sep 2003, Emil Naepflein wrote:

>On Fri, 26 Sep 2003 10:44:23 +0300 (EEST), Jan Ekholm
><chakie@infa.abo.fi> wrote:
>
>> Weird. It did happen about a minute after a recording started, but we've
>> had no problems with disk performance so far. We've successfully recorded
>> three shows at the same time while watching one of the shows. The disk is
>> a pretty new disk with DMA and decent performance, so I don't know what
>> could cause it to get too busy. The logs show no other activity and cron
>> doesn't run at the same time either. If the disk is temporarily busy one
>> would think that it would catch up after a few seconds, especially as the
>> data is stored in a ring buffer with a max size.
>
>Have you removed some recordings before and what filesystem are you
>using?

Something got removed a few hours back, I think, but the actual removing
of the files took place long before the overflows. The filesystem is a
local ext3, ie not over NFS.

>Deletion of large files is slow on some filesystems.
>Have you disabled the power management of the disk?

I haven't enabled it at least... Below is what hdparm tells me, I can't
seem to find anything related to APM or power management. But one would
think that power management would cause problems more often than, say,
every three days.

/dev/hda:
 multcount    = 16 (on)
 IO_support   =  1 (32-bit)
 unmaskirq    =  1 (on)
 using_dma    =  1 (on)
 keepsettings =  0 (off)
 readonly     =  0 (off)
 readahead    =  8 (on)
 geometry     = 7301/255/63, sectors = 117304992, start = 0

 Model=SAMSUNG SP6003H, FwRev=QV100-60, SerialNo=0463J1FT601104
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=34902, SectSize=554, ECCbytes=4
 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=117304992
 IORDY=yes, 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 udma3 udma4 *udma5
 AdvancedPM=no WriteCache=enabled
 Drive conforms to: ATA/ATAPI-6 T13 1410D revision 1:

ATA device, with non-removable media
        Model Number:       SAMSUNG SP6003H
        Serial Number:      0463J1FT601104
        Firmware Revision:  QV100-60
Standards:
        Used: ATA/ATAPI-6 T13 1410D revision 1
        Supported: 6 5 4 3
Configuration:
        Logical         max     current
        cylinders       16383   16383
        heads           16      16
        sectors/track   63      63
        --
        CHS current addressable sectors:   16514064
        LBA    user addressable sectors:  117304992
        device size with M = 1024*1024:       57277 MBytes
        device size with M = 1000*1000:       60060 MBytes (60 GB)
Capabilities:
        LBA, IORDY(cannot be disabled)
        bytes avail on r/w long: 4      Queue depth: 1
        Standby timer values: spec'd by Standard, no device specific
minimum
        R/W multiple sector transfer: Max = 16  Current = 16
        Recommended acoustic management value: 128, current value: 0
        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:
           *    READ BUFFER cmd
           *    WRITE BUFFER cmd
           *    Host Protected Area feature set
           *    Look-ahead
           *    Write cache
           *    Power Management feature set
                Security Mode feature set
                SMART feature set
           *    Mandatory FLUSH CACHE command
                Automatic Acoustic Management feature set
                SET MAX security extension
           *    DOWNLOAD MICROCODE cmd
           *    SMART self-test
           *    SMART error logging
Security:
        Master password revision code = 65534
                supported
        not     enabled
        not     locked
        not     frozen
        not     expired: security count
                supported: enhanced erase
        72min for SECURITY ERASE UNIT. 72min for ENHANCED SECURITY ERASE UNIT.
HW reset results:
        CBLID- above Vih
        Device num = 0 determined by the jumper

-- 

             Gravity is a habit that is hard to shake off.
                                              -- Terry Pratchett, Small Gods


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