Ext4 and scsi commands resubmission

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Hello all,

in open-iscsi, when network connectivity is lost, scsi commands that were in-flight at the moment of disconnection are failed to the SCSI layer. These get resubmitted up to 5 times by the SCSI layer (or so is written in the open-iscsi docs) and after that they are held in the queue (device "blocked") until the network connection is restored.

Now the question is: when SCSI resubmits commands to a device, I suppose they go to the end of the queue for the device, and not at the head like they were. Am I right?
How do filesystems, and in particular ext4, react to that?
I suppose the ordering goes awry, barriers cannot succeed in this way, especially if they were submitted as real SCSI barriers (i.e. without using flush + command + flush workaround)

Thank you
--
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Index of Archives]     [SCSI Target Devel]     [Linux SCSI Target Infrastructure]     [Kernel Newbies]     [IDE]     [Security]     [Git]     [Netfilter]     [Bugtraq]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Linux ATA RAID]     [Linux IIO]     [Samba]     [Device Mapper]
  Powered by Linux