Is there really no comment or suggestions how to avoid server failure when changing the LUN number?
On Thu, May 9, 2019 at 11:43 PM Alibek A. <[email protected]> wrote: > > Hi! > > I want to address the following problem: > On the system with hot-attached new storage volume, such as FC-switch update > configuration for connected FC-HBA on servers, linux kernel reorder block > devices and change names of block devices. Becouse scsi-id, wwn-id and other > is a symbol links to block device names than on change block device name > change path to device. > This causes the server to stop working. > > For example, on server present ZFS pool with attached device by scsi-id > # zpool status > pool: pool > state: ONLINE > scan: scrub repaired 0 in 1h39m with 0 errors on Sun Oct 8 02:03:34 2017 > config: > > NAME STATE READ WRITE CKSUM > pool ONLINE 0 0 0 > scsi-3600144f0c7a5bc61000058d3b96d001d ONLINE 0 0 0 > > Before export new block device from storage to hba, scsi-id have next path to > device: > /dev/disk/by-id/scsi-3600144f0c7a5bc61000058d3b96d001d -> ../../sdd > > When added new block device by FC-switch, FC-HBA kernel change block device > names: > /dev/disk/by-id/scsi-3600144f0c7a5bc61000058d3b96d001d -> ../../sdf > > and ZFS can't access to device until reboot (partprobe, zpool online -e pool > scsi-3600144f0c7a5bc61000058d3b96d001d - may help or may not help) > > Is there any way to fix or change this behavior of the kernel? > > It may be more reasonable to immediately assign an unique persistent > identifier of device and linking other identifiers with it? > > > With regards, Alibek! >
