[systemd-devel] Proposal: Add Drive Enclosure/Slot mapping to systemd
It would be nice if systemd could discover and display enclosure/bay slot mappings for drives in the system. The /dev/disk/by-path method doesn't quite work, for SAS drives the ID can change on hotplug. The slot mapping also doesn't handle PCIe SSD devices as they are bare block devices and don't use SCSI midlayer. Proposing to add support for something like /dev/disk/by-enclosure/encl-XXX-slot-YYY symlink for block devices. ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Proposal: Add Drive Enclosure/Slot mapping to systemd
В Mon, 2 Mar 2015 09:48:51 -0600 Jordan Hargrave jhar...@gmail.com пишет: It would be nice if systemd could discover and display enclosure/bay slot mappings for drives in the system. The /dev/disk/by-path method doesn't quite work, for SAS drives the ID can change on hotplug. The slot mapping also doesn't handle PCIe SSD devices as they are bare block devices and don't use SCSI midlayer. Proposing to add support for something like /dev/disk/by-enclosure/encl-XXX-slot-YYY symlink for block devices. How it should be discovered? Is there universal method that can be used on majority of systems? ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Proposal: Add Drive Enclosure/Slot mapping to systemd
On Mon, Mar 2, 2015 at 10:24 AM, Andrei Borzenkov arvidj...@gmail.com wrote: В Mon, 2 Mar 2015 09:48:51 -0600 Jordan Hargrave jhar...@gmail.com пишет: It would be nice if systemd could discover and display enclosure/bay slot mappings for drives in the system. The /dev/disk/by-path method doesn't quite work, for SAS drives the ID can change on hotplug. The slot mapping also doesn't handle PCIe SSD devices as they are bare block devices and don't use SCSI midlayer. Proposing to add support for something like /dev/disk/by-enclosure/encl-XXX-slot-YYY symlink for block devices. How it should be discovered? Is there universal method that can be used on majority of systems? For Dell system PCIE SSD it requires using ipmitool OEM command to get the correct Bus:Device:Function to Enclosure:Slot mapping. For devices using SAS controllers it's a bit more tricky. There is a sysfs variable for enclosure/slot in sysfs for SAS devices with 8 drives on our servers. The driver for some reason doesn't export this info for Dell systems with 8 drives. Ideally there should be an enclosure.c device defined for every device type. Currently only ses.c seems to use this, but SCSI enclosure services aren't available on SSDs. ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Proposal: Add Drive Enclosure/Slot mapping to systemd
On Mon, Mar 2, 2015 at 12:48 PM, Jordan Hargrave jhar...@gmail.com wrote: It would be nice if systemd could discover and display enclosure/bay slot mappings for drives in the system. The /dev/disk/by-path method doesn't quite work, for SAS drives the ID can change on hotplug. The slot mapping also doesn't handle PCIe SSD devices as they are bare block devices and don't use SCSI midlayer. Proposing to add support for something like /dev/disk/by-enclosure/encl-XXX-slot-YYY symlink for block devices. As far as I am aware, no new things dealing with storage naming rules will be added to udev/systemd, it has to go to whatever other project..(sg3_utils last time I checked) ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Proposal: Add Drive Enclosure/Slot mapping to systemd
On Mon, 02.03.15 15:33, Cristian Rodríguez (crrodrig...@opensuse.org) wrote: On Mon, Mar 2, 2015 at 12:48 PM, Jordan Hargrave jhar...@gmail.com wrote: It would be nice if systemd could discover and display enclosure/bay slot mappings for drives in the system. The /dev/disk/by-path method doesn't quite work, for SAS drives the ID can change on hotplug. The slot mapping also doesn't handle PCIe SSD devices as they are bare block devices and don't use SCSI midlayer. Proposing to add support for something like /dev/disk/by-enclosure/encl-XXX-slot-YYY symlink for block devices. As far as I am aware, no new things dealing with storage naming rules will be added to udev/systemd, it has to go to whatever other project..(sg3_utils last time I checked) Well, that's not precisely true. Yes, more exotic stuff like SCSI/SAS should be maintained elsewhere, like in sg3_utils, but if something is common enough, so that it used on a large percentage of systems (like SATA), then we of course will support this in systemd/udev natively. Lennart -- Lennart Poettering, Red Hat ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
Re: [systemd-devel] Proposal: Add Drive Enclosure/Slot mapping to systemd
On Mon, Mar 2, 2015 at 5:42 PM, Jordan Hargrave jhar...@gmail.com wrote: On Mon, Mar 2, 2015 at 10:24 AM, Andrei Borzenkov arvidj...@gmail.com wrote: В Mon, 2 Mar 2015 09:48:51 -0600 Jordan Hargrave jhar...@gmail.com пишет: It would be nice if systemd could discover and display enclosure/bay slot mappings for drives in the system. The /dev/disk/by-path method doesn't quite work, for SAS drives the ID can change on hotplug. The slot mapping also doesn't handle PCIe SSD devices as they are bare block devices and don't use SCSI midlayer. Proposing to add support for something like /dev/disk/by-enclosure/encl-XXX-slot-YYY symlink for block devices. How it should be discovered? Is there universal method that can be used on majority of systems? For Dell system PCIE SSD it requires using ipmitool OEM command to get the correct Bus:Device:Function to Enclosure:Slot mapping. For devices using SAS controllers it's a bit more tricky. There is a sysfs variable for enclosure/slot in sysfs for SAS devices with 8 drives on our servers. The driver for some reason doesn't export this info for Dell systems with 8 drives. Ideally there should be an enclosure.c device defined for every device type. Currently only ses.c seems to use this, but SCSI enclosure services aren't available on SSDs. Sounds like something the kernel could/should expose in some uniform way, no? ___ systemd-devel mailing list systemd-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/systemd-devel
