All right! The implementation is complete for this and the driver has thoroughly gone through testing. Everything looks good except for a minor glitch.
After the new logical drives are created with "- - -" written to the scsi_host scan attribute, there is a highly noticeable delay before device names (e.g., sda) appears in the /dev directory. If the management application tried to access the device immediately after creating new, the access fails. Putting a 1 second delay helped, but of course this is not a deterministic solution. What are the other possibilities? Thanks -Atul Mukker LSI Logic > -----Original Message----- > From: James Bottomley [mailto:[EMAIL PROTECTED] > Sent: Wednesday, December 15, 2004 1:49 PM > To: Matt Domsch > Cc: Salyzyn, Mark; Bagalkote, Sreenivas; [EMAIL PROTECTED]; > Linux Kernel; SCSI Mailing List; [EMAIL PROTECTED]; Andrew > Morton; Ju, Seokmann; Doelfel, Hardy; Mukker, Atul > Subject: Re: How to add/drop SCSI drives from within the driver? > > On Wed, 2004-12-15 at 01:24 -0600, Matt Domsch wrote: > > James, I've been thinking about this a little more, and you > may be on > > to something here. Let each driver add files as such: > > > > /sys/class/scsi_host > > |-- host0 > > | |-- add_logical_drive > > | |-- remove_logical_drive > > | `-- rescan_logical_drive > > > > Then we can go 2 ways with this. > > 1) driver functions directly call scsi_add_device(), > > scsi_remove_device(), and something for rescan (option 2 > handles this > > one cleanly for us). ATM, megaraid_mbox doesn't implement a rescan > > function, so this point may be moot. > > > > 2) driver functions call a midlayer library function, which invokes > > /sbin/hotplug with appropriate data, and add a new /etc/hotplug.d > > helper app which would then write to these files: > > > > /sys/class/scsi_host > > |-- host0 > > | |-- scan > > /sys/devices/pci0000:0x/0000:0x:0x.0/host0 > > |-- 0:0:0:0 > > | |-- delete > > | |-- rescan > > > > to do likewise. > > I'll buy this (option 2).. it seems like a good way to export > the megaraid specific information and at the same time > integrate it more fully into the evolving hotplug infrastructure. > > James > > > - > To unsubscribe from this list: send the line "unsubscribe > linux-kernel" in the body of a message to > [EMAIL PROTECTED] More majordomo info at > http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
