On Aug 30, 2012, at 11:49 AM, Michael Christie <micha...@cs.wisc.edu> wrote:

> On Aug 30, 2012, at 11:18 AM, Spelic <spe...@shiftmail.org> wrote:
>> Hello all
>> I am trying to fstrim a filesystem on an iSCSI disk through open-iscsi. The 
>> target is on LIO .
>> I am receiving:
>> fstrim: /: FITRIM ioctl failed: Operation not supported
>> At LIO side there is nothing in dmesg, so I am supposing it's a open-iscsi 
>> problem (lack of feature?)
> The iscsi layer does not do anything special to support trim/discard. We just 
> pass whatever info we have to upper layers and passes commands down to the 
> target/disks.
> Does your disk support trim/discard? Are you doing passthrough to a disk that 
> support trim/discard or is lio emulating it?

When you run fstrim what errors do you see in /var/log/messages? Do you see 
something about a ILLEGAL_REQUEST maybe?

You received this message because you are subscribed to the Google Groups 
"open-iscsi" group.
To post to this group, send email to open-iscsi@googlegroups.com.
To unsubscribe from this group, send email to 
For more options, visit this group at 

Reply via email to