that always happen, every test have such errors. And our cluster and client that running on X86 works fine, never seen bad crc error. 2015-05-16 17:30 GMT+08:00 Haomai Wang <haomaiwang@xxxxxxxxx>: > is this always happen or occasionally? > > On Sat, May 16, 2015 at 10:10 AM, huang jun <hjwsm1989@xxxxxxxxx> wrote: >> hi,steve >> >> 2015-05-15 16:36 GMT+08:00 Steve Capper <steve.capper@xxxxxxxxxx>: >>> On 15 May 2015 at 00:51, huang jun <hjwsm1989@xxxxxxxxx> wrote: >>>> hi,all >>> >>> Hi HuangJun, >>> >>>> >>>> We run ceph cluster on ARM platform (arm64, linux kernel 3.14, OS >>>> ubuntu 14.10), and use "dd if=/dev/zero of=/mnt/test bs=4M count=125" >>>> to write data. On the osd side, we got bad data CRC error. >>>> >>>> The kclient log: (tid=6) >>>> May 14 17:21:08 node103 kernel: [ 180.194312] CPU[0] libceph: >>>> send_request ffffffc8d252f000 tid-6 to osd0 flags 36 pg 1.9aae829f req >>>> data size is 4194304 >>>> May 14 17:21:08 node103 kernel: [ 180.194316] CPU[0] libceph: tid-6 >>>> ----- ffffffc0702f66c8 to osd0 42=osd_op len 197+0+4194304 ----- >>>> libceph: tid-6 front_crc is 388648745 middle_crc is 0 data_crc is 3036014994 >>>> >>>> The OSD-0 log: >>>> 2015-05-13 08:12:50.049345 7f378d8d8700 0 seq 3 tid 6 front_len 197 >>>> mid_len 0 data_len 4194304 >>>> 2015-05-13 08:12:50.049348 7f378d8d8700 0 crc in front 388648745 exp 388648745 >>>> 2015-05-13 08:12:50.049395 7f378d8d8700 0 crc in middle 0 exp 0 >>>> 2015-05-13 08:12:50.049964 7f378d8d8700 0 crc in data 0 exp 3036014994 >>>> 2015-05-13 08:12:50.050234 7f378d8d8700 0 bad crc in data 0 != exp 3036014994 >>>> >>>> some considerations: >>>> 1) we use ceph 0.80.7 realse version and compile it on ARM, did this >>>> works? or does ceph's code has ARM branch? >>> >>> We did run a Ceph version close to that for 64-bit ARM, I'm checking >>> out 0.80.7 now to test. >>> In v9.0.0, there is some code to use the ARM optional crc32c >>> instructions, but this isn't in 0.80.7. >>> >>>> >>>> 2) as we have write 125 objects, only few of them report CRC error, >>>> and the right object's data_crc is 0 both on osd and kclient. the >>>> wrong object's data_crc is not 0 on kclient, but osd calculate result >>>> 0. the object data came from /dev/zero, i think the data_crc should be >>>> 0, am i right? >>>> >>> >>> If the initial CRC seed value is non-zero, then the CRC of a buffer >>> full of zeros won't be zero. >>> So ceph_crc32c(somethingnonzero, zerofilledbuffer, len), will be non-zero. >>> >>> I would like to reproduce this problem here. >>> What steps did you take before this error occurred? >>> Is this a cephfs filesystem or something on top of an RBD image? >>> Which kernel are you running? Is it the one that comes with Ubuntu? >>> (If so which package version is it?) >>> >> We use linux kernel version 3.14 and we just tested it on Ubuntu, and >> ceph version v0.80.7. Both cephfs and RBD image have CRC problems. >> I'm not sure whether it's related to Memory, since we tested many >> times, but just a few reported CRC error. >> As i mentioned, i doubt the memory fault changed the data, because we >> write 125 objects, and the all data_crc is 0 except the Bad CRC >> object's data_crc. Any tips are welcome. >> >>> Cheers, >>> -- >>> Steve >> >> >> >> -- >> thanks >> huangjun >> -- >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > -- > Best Regards, > > Wheat -- thanks huangjun -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
