<div style="line-height:1.7;color:#000000;font-size:14px;font-family:Arial"><div>hello, everyone!</div><div> When we call "SDM.merge", we need a param "base_generation" in [1], and I know [2] will be called and "base_generation" is translated to "<span style="background-color: rgb(255, 251, 221); color: rgb(36, 41, 46); font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 12px; white-space: pre;">requested_gen</span>", that means "GEN" in disk metadata?</div><div>If so, how did this "GEN" worked and seted? I see many *.meta is "<span style="color: rgb(36, 41, 46); font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 12px; white-space: pre-wrap;">GEN=0</span>", and some is "<span style="color: rgb(36, 41, 46); font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 12px; white-space: pre-wrap;">GEN=1</span>" in [3]. </div><div><br></div><div><br></div><div><span style="color: rgb(51, 51, 51); font-family: arial; font-size: 13.91px;">Hope to get your reply, Thank you!</span></div><div><br></div><div><br></div><div>[1] {'subchain_info': {'img_id': '91837525-850d-4e74-9a7e-c89b793d0e5b', 'sd_id': '93b8a2c9-f527-4eb3-acfb-af76ab24fbbe', 'top_id': '4e51d4e5-9630-45a6-9829-012460e7d67a', 'base_id': 'fdf47584-21aa-45b2-9925-157ff54f5e7e', '<span style="color: rgb(255, 0, 0);">base_generation</span>': 0}, 'job_id': '766a3050-476c-48ae-9470-3bec7867a6cd'}</div><div><br></div><div>[2] <span style="color: rgb(36, 41, 46); font-family: SFMono-Regular, Consolas, "Liberation Mono", Menlo, Courier, monospace; font-size: 12px; white-space: pre-wrap;"><a href="https://github.com/oVirt/vdsm/blob/07d05287ac1496ad49915e026d34e29ca4da635b/lib/vdsm/storage/volume.py#L602" _src="https://github.com/oVirt/vdsm/blob/07d05287ac1496ad49915e026d34e29ca4da635b/lib/vdsm/storage/volume.py#L602">https://github.com/oVirt/vdsm/blob/07d05287ac1496ad49915e026d34e29ca4da635b/lib/vdsm/storage/volume.py#L602</a></span></div><div><font color="#24292e" face="SFMono-Regular, Consolas, Liberation Mono, Menlo, Courier, monospace"><span style="font-size: 12px; white-space: pre-wrap;"><br></span></font></div><div>[3] </div><div><font color="#24292e" face="SFMono-Regular, Consolas, Liberation Mono, Menlo, Courier, monospace"><span style="font-size: 12px; white-space: pre-wrap;">DOMAIN=93b8a2c9-f527-4eb3-acfb-af76ab24fbbe
CTIME=1516090454
FORMAT=COW
DISKTYPE=2
LEGALITY=LEGAL
SIZE=167772160
VOLTYPE=INTERNAL
DESCRIPTION=
IMAGE=f882e7cc-f57e-48ff-9b87-bba35331e983
PUUID=9050f956-6836-4fce-8d27-69df13c4f85c
MTIME=0
POOL_UUID=
TYPE=SPARSE
GEN=1
EOF</span></font></div></div><br><br><span title="neteasefooter"><p> </p></span>