Danilo, If I have a h/w support for IDE hot swap then what do you recommand for the same as you suggested for scsi below? Thansk, Bo ----- Original Message ----- From: "Danilo Godec" <danci@agenda.si> To: "Maurice Hilarius" <maurice@harddata.com> Cc: "Linux-raid" <linux-raid@vger.kernel.org> Sent: Thursday, April 18, 2002 11:20 PM Subject: Re: couple of seemingly dumb questions > On Thu, 18 Apr 2002, Maurice Hilarius wrote: > > > On software RAID/raidtools how does one change the rebuild priority on a > > replacement disk or resync? > > I don't mind giving higher CPU priority, since in many cases the boxes I am > > using have lots more CPU than is being used most of the time. > > With 2.2 kernels, you can simply use 'cat /proc/sys/dev/md/speed-limit', > to see the *minimum* rebuild rate. You can change it using > 'echo 200000 > /proc/sys/dev/md/speed-limit'. > > With 2.4 kernels, there are two files in '/proc/sys/dev/raid/', called > 'speed_limit_max' and 'speed_limit_min'. I think the rest is pretty > obvious. > > > Secondly: > > With a software RAID5 setup, with disks in removable hot-swap trays, I want > > to be able to pull a failed disk and replace it and have it then rebuild. > > Problem is, when I pull the disk I get lots of error messages, and then > > when I replace it there is nothing happening to redetect that the disk is > > changed, and allow me to rebuild. If I reboot then the machine does resync > > with the new drive, but surely there must be a way without a reboot? > > I suppose you have SCSI disks (I think hot-swap IDE is just not that far > along). > > First you have to make sure, that the failed disk is not in use anymore. > This means using 'raidhotremove' for every partition of that disk, that > may be in use (also check for non-RAID partition, if they exist). When > you're sure the disk is not used anymore, make the kernel 'release' the > disk from SCSI bus using: > > echo "scsi remove-single-device 0 1 2 3" >/proc/scsi/scsi > > Check 'cat /proc/scsi/scsi' to check if the failed disk is still listed. > If it is, it's probably still in use and can't yet be removed. Re-check > the first step... Else, you can pull the disk out and install a new one. > > Before you can use the new disk, you have to make the kernel accept it to > SCSI. Use: > > echo "scsi add-single-device 0 1 2 3" >/proc/scsi/scsi > > Check 'cat /proc/scsi/scsi' if the new disk has appeared. If it has, > you're all set to partition the disk and use it at will. > > D. > > PS: See /usr/src/linux/drivers/scsi/scsi.c for more about this > /proc/scsi/scsi commands. > > - > To unsubscribe from this list: send the line "unsubscribe linux-raid" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html > - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
