[plamo:21851] Re: RAIDの構築に際して

[Takehiko Ogata]

尾形です。

詳細な資料どうもありがとうございました。

では。


Seitarou Sugawara wrote:

>皆さん、こんにちは。
>Software RAID1の続きです。
>
>linux/drivers/md/md.cのコメントにこんなことが書いてあります。raidの再
>構築のスピードは/proc/sys/dev/dev/raid/speed_limit_m{ax,in}で設定でき
>ると。
>
>/*
> * Current RAID-1,4,5 parallel reconstruction 'guaranteed speed limit'
> * is 100 KB/sec, so the extra system load does not show up that much.
> * Increase it if you want to have more _guaranteed_ speed. Note that
> * the RAID driver will use the maximum available bandwith if the IO
> * subsystem is idle. There is also an 'absolute maximum'
>reconstruction
> * speed limit - in case reconstruction slows down your system despite
> * idle IO detection.
> *
> * you can change it via /proc/sys/dev/raid/speed_limit_min and _max.
> */
>
>ハードスペックは次のとおりです。
>
># hdparm -Tt /dev/md1
>
>/dev/md1:
> Timing buffer-cache reads:   128 MB in  1.50 seconds = 85.33 MB/sec
> Timing buffered disk reads:  64 MB in  1.69 seconds = 37.87 MB/sec
>
># cat /proc/ide/hda/model
>ST380021A
>
># cat /proc/sys/dev/raid/speed_limit_m{ax,in}
>100000
>100
>
># lspci
>00:00.0 Host bridge: Intel Corp. 82815 815 Chipset Host Bridge and
>Memory Controller Hub (rev 04)
>00:02.0 VGA compatible controller: Intel Corp. 82815 CGC [Chipset
>Graphics Controller] (rev 04)
>00:1e.0 PCI bridge: Intel Corp. 82801BA/CA/DB/EB PCI Bridge (rev 05)
>00:1f.0 ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 05)
>00:1f.1 IDE interface: Intel Corp. 82801BA IDE U100 (rev 05)
>00:1f.2 USB Controller: Intel Corp. 82801BA/BAM USB (Hub  (rev 05)
>00:1f.3 SMBus: Intel Corp. 82801BA/BAM SMBus (rev 05)
>00:1f.4 USB Controller: Intel Corp. 82801BA/BAM USB (Hub  (rev 05)
>00:1f.5 Multimedia audio controller: Intel Corp. 82801BA/BAM AC'97
>Audio (rev 05)
>01:02.0 Ethernet controller: 3Com Corporation 3c905C-TX/TX-M [Tornado]
>(rev 78)
>
>菅原
>