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Re: Hardware RAID Q



very interesting, Thanks :)
Will it work with raid ?
any one know ?

If not any other way to hot swap software raid scsi HD ?

Isaac Aaron wrote:

> If you only need hot-swapping, then you don't need a RAID card.
> I bought myself a computer that has a hot swap deck (but not with raid) the
> kernel calls it:
>
> Host: scsi1 Channel: 00 Id: 06 Lun: 00
>   Vendor: ESG-SHV  Model: SCA HSBP M7      Rev: 0.08
>   Type:   Processor                        ANSI SCSI revision: 02
>
> Anyway, check out "Scsi-Programming HOWTO - where it says:
>
>   4.3.1.  Dynamically insert and remove SCSI devices
>
>   If a newer kernel and the /proc file system is running, a non-busy
>   device can be removed and installed 'on the fly'.
>
> ---quote---
>
>   To remove a SCSI device:
>
>        echo "scsi remove-single-device a b c d" > /proc/scsi/scsi
>
>   and similar, to add a SCSI device, do
>
>        echo "scsi add-single-device a b c d" > /proc/scsi/scsi
>
>   where
>
>              a == hostadapter id (first one being 0)
>              b == SCSI channel on hostadapter (first one being 0)
>              c == ID
>              d == LUN (first one being 0)
>
> ---end quote---
>
> This means you have to umount all of the partitions first, then
> echo "scsi remove-single-device a b c d" > /proc/scsi/scsi
>
> And to return it back:
> echo "scsi remove-single-device a b c d" > /proc/scsi/scsi
> and mount the partitions back.
>
> You get b,c and d from /proc/scsi/scsi and a by matching the cards with
> /proc/scsi/<adapter module>/<CardID>
>
> Isaac Aaron
> Azorim Construction
>
>
>                     Ben-Nes
>                     Michael <miki        To:     ILUG <linux-il@linux.org.il>
>                     @                    cc:
>                     canaan.co.il>        Subject:     Hardware RAID Q
>                     Sent by:
>                     linux-il-boun
>                     ce@
>                     cs.huji.ac.il
>
>
>                     17/09/00
>                     12:50
>
>
>
> Hi All ( Again :) )
>
> Im going to use raid and I was thinking of using hardware raid.
>
> Any one can recommend me what raid card I should buy ( on linux OS
> obviously )
>
> Im interested in Hot Swapping ( if im correct this refer to remove one
> of the HD from the RAID (1,5) while power on ).
> This is important and I was wondering if software raid can handle hot
> swapping.
>
> Sorry if I said few strange thing, this area is new to me :)
>
> --
> --------------------------
> Canaan Surfing Ltd.
> Internet Service Providers
> Ben-Nes Michael - Manager
> Tel: 972-6-6925757
> Fax: 972-6-6925858
> http://www.canaan.co.il
> --------------------------
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--
--------------------------
Canaan Surfing Ltd.
Internet Service Providers
Ben-Nes Michael - Manager
Tel: 972-6-6925757
Fax: 972-6-6925858
http://www.canaan.co.il
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