Il 18/11/2012 23:00, Stefan Priebe ha scritto: > Hi Paolo, > > Am 06.11.2012 23:42, schrieb Paolo Bonzini: >> >>> i wantes to use scsi unmap with rbd. rbd documention says you need to >>> set discard_granularity=512 for the device. I'm using qemu 1.2. >>> >>> If i set this and send an UNMAP command i get this kernel output: >> >> The discard request is failing. Please check why with a breakpoint on >> rbd_aio_discard_wrapper or scsi_handle_rw_error for example. >> >> Paolo > > I'm sorry the discard requests aren't failing. Qemu / Block driver > starts to cancel a bunch of requests.
That is being done in the kernel (the guest, I think) because the UNMAPs are taking too long. Paolo > [ 39.577194] sd 2:0:0:1: [sdb] > [ 39.577194] Result: hostbyte=DID_OK driverbyte=DRIVER_SENSE > [ 39.577194] sd 2:0:0:1: [sdb] > [ 39.577194] Sense Key : Aborted Command [current] > [ 39.577194] sd 2:0:0:1: [sdb] > [ 39.577194] Add. Sense: I/O process terminated > [ 39.577194] sd 2:0:0:1: [sdb] CDB: > [ 39.577194] Write same(16): 93 08 00 00 00 00 04 7f ff f7 00 62 00 09 > 00 00 > [ 39.577194] end_request: I/O error, dev sdb, sector 75497463
