On further debugging, we found that if we are using a kernel version 2.6.16, the device mapper was functioning correctly as expected. The device mapper version in 2.6.16 is 4.5.0-ioctl and the device mapper version in 2.6.19.1 kernel is 4.11.0-ioctl. Is there a difference between the 4.5.0 version and 4.11.0 version that could be causing the problem that we are facing? Is there a list of changes that has gone into device-mapper between these two versions? Thanks in advance for your inputs, Srini On 2/8/07, Srini <v.vvsrini@xxxxxxxxx> wrote:
Hi all, I am currently trying to create a snapshot through EVMS (v2.5.4) and I am getting an error from the device mapper module in the kernel version 2.6.19.1 (dmesg). The following is the error message: device-mapper: table: 253:2: snapshot-origin: unknown target type device-mapper: ioctl: error adding target to table device-mapper: table: 253:7: snapshot: requires exactly 4 arguments device-mapper: ioctl: error adding target to table device-mapper: table: 253:7: snapshot: requires exactly 4 arguments device-mapper: ioctl: error adding target to table The lsmod command on the same machine shows the dm-snapshat module to have been successfully inserted: -bash-3.00# lsmod Module Size Used by Not tainted dm_snapshot 17192 1 - Live 0xf8948000 dm_mod 51736 14 dm_snapshot, Live 0xf8906000 nfsd 216944 0 - Live 0xf89c4000 exportfs 5632 1 nfsd, Live 0xf88cf000 The device mapper version itself (as printed in dmesg) is as follows: device-mapper: ioctl: 4.10.0-ioctl (2006-09-14) initialised: dm-devel@xxxxxxxxxx Since the device mapper is returning an error, the EVMS Snapshot plugin is returning an invalid argument (EINVAL) and exiting. Any help would be much highly appreciated since we have been facing this issue for a week now... Thanks in advance for all your inputs, srini
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