Just a small update — the blocked ops did disappear after doubling the target_max_bytes. We’ll see if it sticks! I’ve thought I’ve solved this blocked ops problem about 10 times now :) Assuming this is the issue, is there any workaround for this problem (or is it working as intended)? (Should I set up a cron to run cache-try-flush-evict-all every night? :)) Another curious thing is that a rolling restart of all OSDs also seems to fix the problem — for a time. I’m not sure how that would fit in if this is the problem. —Lincoln > On Sep 17, 2015, at 12:07 PM, Lincoln Bryant <lincolnb@xxxxxxxxxxxx> wrote: > > We have CephFS utilizing a cache tier + EC backend. The cache tier and ec pool sit on the same spinners — no SSDs. Our cache tier has a target_max_bytes of 5TB and the total storage is about 1PB. > > I do have a separate test pool with 3x replication and no cache tier, and I still see significant performance drops and blocked ops with no/minimal client I/O from CephFS. Right now I have 530 blocked ops with 20MB/s of client write I/O and no active scrubs. The rados bench on my test pool looks like this: > > sec Cur ops started finished avg MB/s cur MB/s last lat avg lat > 0 0 0 0 0 0 - 0 > 1 31 94 63 251.934 252 0.31017 0.217719 > 2 31 103 72 143.969 36 0.978544 0.260631 > 3 31 103 72 95.9815 0 - 0.260631 > 4 31 111 80 79.9856 16 2.29218 0.476458 > 5 31 112 81 64.7886 4 2.5559 0.50213 > 6 31 112 81 53.9905 0 - 0.50213 > 7 31 115 84 47.9917 6 3.71826 0.615882 > 8 31 115 84 41.9928 0 - 0.615882 > 9 31 115 84 37.327 0 - 0.615882 > 10 31 117 86 34.3942 2.66667 6.73678 0.794532 > > I’m really leaning more toward it being a weird controller/disk problem. > > As a test, I suppose I could double the target_max_bytes, just so the cache tier stops evicting while client I/O is writing? > > —Lincoln > >> On Sep 17, 2015, at 11:59 AM, Nick Fisk <nick@xxxxxxxxxx> wrote: >> >> Ah right....this is where it gets interesting. >> >> You are probably hitting a cache full on a PG somewhere which is either making everything wait until it flushes or something like that. >> >> What cache settings have you got set? >> >> I assume you have SSD's for the cache tier? Can you share the size of the pool. >> >> If possible could you also create a non tiered test pool and do some benchmarks on that to rule out any issue with the hardware and OSD's. >> >>> -----Original Message----- >>> From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf Of >>> Lincoln Bryant >>> Sent: 17 September 2015 17:54 >>> To: Nick Fisk <nick@xxxxxxxxxx> >>> Cc: ceph-users@xxxxxxxxxxxxxx >>> Subject: Re: Ceph cluster NO read / write performance :: Ops >>> are blocked >>> >>> Hi Nick, >>> >>> Thanks for responding. Yes, I am. >>> >>> —Lincoln >>> >>>> On Sep 17, 2015, at 11:53 AM, Nick Fisk <nick@xxxxxxxxxx> wrote: >>>> >>>> You are getting a fair amount of reads on the disks whilst doing these >>> writes. You're not using cache tiering are you? >>>> >>>>> -----Original Message----- >>>>> From: ceph-users [mailto:ceph-users-bounces@xxxxxxxxxxxxxx] On Behalf >>>>> Of Lincoln Bryant >>>>> Sent: 17 September 2015 17:42 >>>>> To: ceph-users@xxxxxxxxxxxxxx >>>>> Subject: Re: Ceph cluster NO read / write performance :: >>>>> Ops are blocked >>>>> >>>>> Hello again, >>>>> >>>>> Well, I disabled offloads on the NIC -- didn’t work for me. I also >>>>> tried setting net.ipv4.tcp_moderate_rcvbuf = 0 as suggested elsewhere >>>>> in the thread to no avail. >>>>> >>>>> Today I was watching iostat on an OSD box ('iostat -xm 5') when the >>>>> cluster got into “slow” state: >>>>> >>>>> Device: rrqm/s wrqm/s r/s w/s rMB/s wMB/s avgrq-sz avgqu- >>> sz >>>>> await svctm %util >>>>> sdb 0.00 13.57 84.23 167.47 0.45 2.78 26.26 2.06 8.18 >>> 3.85 >>>>> 96.93 >>>>> sdc 0.00 46.71 5.59 289.22 0.03 2.54 17.85 3.18 10.77 >>> 0.97 >>>>> 28.72 >>>>> sdd 0.00 16.57 45.11 91.62 0.25 0.55 12.01 0.75 5.51 >>> 2.45 >>>>> 33.47 >>>>> sde 0.00 13.57 6.99 143.31 0.03 2.53 34.97 1.99 13.27 >>> 2.12 >>>>> 31.86 >>>>> sdf 0.00 18.76 4.99 158.48 0.10 1.09 14.88 1.26 7.69 1.24 >>>>> 20.26 >>>>> sdg 0.00 25.55 81.64 237.52 0.44 2.89 21.36 4.14 12.99 >>> 2.58 >>>>> 82.22 >>>>> sdh 0.00 89.42 16.17 492.42 0.09 3.81 15.69 17.12 33.66 >>> 0.73 >>>>> 36.95 >>>>> sdi 0.00 20.16 17.76 189.62 0.10 1.67 17.46 3.45 16.63 >>> 1.57 >>>>> 32.55 >>>>> sdj 0.00 31.54 0.00 185.23 0.00 1.91 21.15 3.33 18.00 >>> 0.03 >>>>> 0.62 >>>>> sdk 0.00 26.15 2.40 133.33 0.01 0.84 12.79 1.07 7.87 >>> 0.85 >>>>> 11.58 >>>>> sdl 0.00 25.55 9.38 123.95 0.05 1.15 18.44 0.50 3.74 1.58 >>>>> 21.10 >>>>> sdm 0.00 6.39 92.61 47.11 0.47 0.26 10.65 1.27 9.07 >>> 6.92 >>>>> 96.73 >>>>> >>>>> The %util is rather high on some disks, but I’m not an expert at >>>>> looking at iostat so I’m not sure how worrisome this is. Does >>>>> anything here stand out to anyone? >>>>> >>>>> At the time of that iostat, Ceph was reporting a lot of blocked ops >>>>> on the OSD associated with sde (as well as about 30 other OSDs), but >>>>> it doesn’t look all that busy. Some simple ‘dd’ tests seem to indicate the >>> disk is fine. >>>>> >>>>> Similarly, iotop seems OK on this host: >>>>> >>>>> TID PRIO USER DISK READ DISK WRITE SWAPIN IO> COMMAND >>>>> 472477 be/4 root 0.00 B/s 5.59 M/s 0.00 % 0.57 % ceph-osd -i 111 -- >>> pid- >>>>> file /var/run/ceph/osd.111.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 470621 be/4 root 0.00 B/s 10.09 M/s 0.00 % 0.40 % ceph-osd -i 111 -- >>> pid- >>>>> file /var/run/ceph/osd.111.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3495447 be/4 root 0.00 B/s 272.19 K/s 0.00 % 0.36 % ceph-osd -i 114 -- >>>>> pid-file /var/run/ceph/osd.114.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3488389 be/4 root 0.00 B/s 596.80 K/s 0.00 % 0.16 % ceph-osd -i 109 -- >>>>> pid-file /var/run/ceph/osd.109.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3488060 be/4 root 0.00 B/s 600.83 K/s 0.00 % 0.15 % ceph-osd -i 108 -- >>>>> pid-file /var/run/ceph/osd.108.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3505573 be/4 root 0.00 B/s 528.25 K/s 0.00 % 0.10 % ceph-osd -i 119 -- >>>>> pid-file /var/run/ceph/osd.119.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3495434 be/4 root 0.00 B/s 2.02 K/s 0.00 % 0.10 % ceph-osd -i 114 -- >>> pid- >>>>> file /var/run/ceph/osd.114.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3502327 be/4 root 0.00 B/s 506.07 K/s 0.00 % 0.09 % ceph-osd -i 118 -- >>>>> pid-file /var/run/ceph/osd.118.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3489100 be/4 root 0.00 B/s 106.86 K/s 0.00 % 0.09 % ceph-osd -i 110 -- >>>>> pid-file /var/run/ceph/osd.110.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3496631 be/4 root 0.00 B/s 229.85 K/s 0.00 % 0.05 % ceph-osd -i 115 -- >>>>> pid-file /var/run/ceph/osd.115.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3505561 be/4 root 0.00 B/s 2.02 K/s 0.00 % 0.03 % ceph-osd -i 119 -- >>>>> pid-file /var/run/ceph/osd.119.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3488059 be/4 root 0.00 B/s 2.02 K/s 0.00 % 0.03 % ceph-osd -i 108 -- >>> pid- >>>>> file /var/run/ceph/osd.108.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3488391 be/4 root 46.37 K/s 431.47 K/s 0.00 % 0.02 % ceph-osd -i 109 - >>> - >>>>> pid-file /var/run/ceph/osd.109.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3500639 be/4 root 0.00 B/s 221.78 K/s 0.00 % 0.02 % ceph-osd -i 117 -- >>>>> pid-file /var/run/ceph/osd.117.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3488392 be/4 root 34.28 K/s 185.49 K/s 0.00 % 0.02 % ceph-osd -i 109 - >>> - >>>>> pid-file /var/run/ceph/osd.109.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> 3488062 be/4 root 4.03 K/s 66.54 K/s 0.00 % 0.02 % ceph-osd -i 108 -- >>> pid- >>>>> file /var/run/ceph/osd.108.pid -c /etc/ceph/ceph.conf --cluster ceph >>>>> >>>>> These are all 6TB seagates in single-disk RAID 0 on a PERC H730 Mini >>>>> controller. >>>>> >>>>> I did try removing the disk with 20k non-medium errors, but that >>>>> didn’t seem to help. >>>>> >>>>> Thanks for any insight! >>>>> >>>>> Cheers, >>>>> Lincoln Bryant >>>>> >>>>>> On Sep 9, 2015, at 1:09 PM, Lincoln Bryant <lincolnb@xxxxxxxxxxxx> >>> wrote: >>>>>> >>>>>> Hi Jan, >>>>>> >>>>>> I’ll take a look at all of those things and report back (hopefully >>>>>> :)) >>>>>> >>>>>> I did try setting all of my OSDs to writethrough instead of >>>>>> writeback on the >>>>> controller, which was significantly more consistent in performance >>>>> (from 1100MB/s down to 300MB/s, but still occasionally dropping to >>>>> 0MB/s). Still plenty of blocked ops. >>>>>> >>>>>> I was wondering if not-so-nicely failing OSD(s) might be the cause. >>>>>> My >>>>> controller (PERC H730 Mini) seems frustratingly terse with SMART >>>>> information, but at least one disk has a “Non-medium error count” of >>>>> over 20,000.. >>>>>> >>>>>> I’ll try disabling offloads as well. >>>>>> >>>>>> Thanks much for the suggestions! >>>>>> >>>>>> Cheers, >>>>>> Lincoln >>>>>> >>>>>>> On Sep 9, 2015, at 3:59 AM, Jan Schermer <jan@xxxxxxxxxxx> wrote: >>>>>>> >>>>>>> Just to recapitulate - the nodes are doing "nothing" when it drops to >>> zero? >>>>> Not flushing something to drives (iostat)? Not cleaning pagecache >>>>> (kswapd and similiar)? Not out of any type of memory (slab, >>>>> min_free_kbytes)? Not network link errors, no bad checksums (those are >>> hard to spot, though)? >>>>>>> >>>>>>> Unless you find something I suggest you try disabling offloads on >>>>>>> the NICs >>>>> and see if the problem goes away. >>>>>>> >>>>>>> Jan >>>>>>> >>>>>>>> On 08 Sep 2015, at 18:26, Lincoln Bryant <lincolnb@xxxxxxxxxxxx> >>> wrote: >>>>>>>> >>>>>>>> For whatever it’s worth, my problem has returned and is very >>>>>>>> similar to >>>>> yours. Still trying to figure out what’s going on over here. >>>>>>>> >>>>>>>> Performance is nice for a few seconds, then goes to 0. This is a >>>>>>>> similar setup to yours (12 OSDs per box, Scientific Linux 6, Ceph >>>>>>>> 0.94.3, etc) >>>>>>>> >>>>>>>> 384 16 29520 29504 307.287 1188 0.0492006 0.208259 >>>>>>>> 385 16 29813 29797 309.532 1172 0.0469708 0.206731 >>>>>>>> 386 16 30105 30089 311.756 1168 0.0375764 0.205189 >>>>>>>> 387 16 30401 30385 314.009 1184 0.036142 0.203791 >>>>>>>> 388 16 30695 30679 316.231 1176 0.0372316 0.202355 >>>>>>>> 389 16 30987 30971 318.42 1168 0.0660476 0.200962 >>>>>>>> 390 16 31282 31266 320.628 1180 0.0358611 0.199548 >>>>>>>> 391 16 31568 31552 322.734 1144 0.0405166 0.198132 >>>>>>>> 392 16 31857 31841 324.859 1156 0.0360826 0.196679 >>>>>>>> 393 16 32090 32074 326.404 932 0.0416869 0.19549 >>>>>>>> 394 16 32205 32189 326.743 460 0.0251877 0.194896 >>>>>>>> 395 16 32302 32286 326.897 388 0.0280574 0.194395 >>>>>>>> 396 16 32348 32332 326.537 184 0.0256821 0.194157 >>>>>>>> 397 16 32385 32369 326.087 148 0.0254342 0.193965 >>>>>>>> 398 16 32424 32408 325.659 156 0.0263006 0.193763 >>>>>>>> 399 16 32445 32429 325.054 84 0.0233839 0.193655 >>>>>>>> 2015-09-08 11:22:31.940164 min lat: 0.0165045 max lat: 67.6184 avg lat: >>>>> 0.193655 >>>>>>>> sec Cur ops started finished avg MB/s cur MB/s last lat avg lat >>>>>>>> 400 16 32445 32429 324.241 0 - 0.193655 >>>>>>>> 401 16 32445 32429 323.433 0 - 0.193655 >>>>>>>> 402 16 32445 32429 322.628 0 - 0.193655 >>>>>>>> 403 16 32445 32429 321.828 0 - 0.193655 >>>>>>>> 404 16 32445 32429 321.031 0 - 0.193655 >>>>>>>> 405 16 32445 32429 320.238 0 - 0.193655 >>>>>>>> 406 16 32445 32429 319.45 0 - 0.193655 >>>>>>>> 407 16 32445 32429 318.665 0 - 0.193655 >>>>>>>> >>>>>>>> needless to say, very strange. >>>>>>>> >>>>>>>> —Lincoln >>>>>>>> >>>>>>>> >>>>>>>>> On Sep 7, 2015, at 3:35 PM, Vickey Singh >>>>> <vickey.singh22693@xxxxxxxxx> wrote: >>>>>>>>> >>>>>>>>> Adding ceph-users. >>>>>>>>> >>>>>>>>> On Mon, Sep 7, 2015 at 11:31 PM, Vickey Singh >>>>> <vickey.singh22693@xxxxxxxxx> wrote: >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, Sep 7, 2015 at 10:04 PM, Udo Lembke >>>>> <ulembke@xxxxxxxxxxxx> wrote: >>>>>>>>> Hi Vickey, >>>>>>>>> Thanks for your time in replying to my problem. >>>>>>>>> >>>>>>>>> I had the same rados bench output after changing the motherboard >>>>>>>>> of >>>>> the monitor node with the lowest IP... >>>>>>>>> Due to the new mainboard, I assume the hw-clock was wrong during >>>>> startup. Ceph health show no errors, but all VMs aren't able to do IO >>>>> (very high load on the VMs - but no traffic). >>>>>>>>> I stopped the mon, but this don't changed anything. I had to >>>>>>>>> restart all >>>>> other mons to get IO again. After that I started the first mon also >>>>> (with the right time now) and all worked fine again... >>>>>>>>> >>>>>>>>> Thanks i will try to restart all OSD / MONS and report back , if >>>>>>>>> it solves my problem >>>>>>>>> >>>>>>>>> Another posibility: >>>>>>>>> Do you use journal on SSDs? Perhaps the SSDs can't write to >>>>>>>>> garbage >>>>> collection? >>>>>>>>> >>>>>>>>> No i don't have journals on SSD , they are on the same OSD disk. >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> Udo >>>>>>>>> >>>>>>>>> >>>>>>>>> On 07.09.2015 16:36, Vickey Singh wrote: >>>>>>>>>> Dear Experts >>>>>>>>>> >>>>>>>>>> Can someone please help me , why my cluster is not able write >>> data. >>>>>>>>>> >>>>>>>>>> See the below output cur MB/S is 0 and Avg MB/s is decreasing. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Ceph Hammer 0.94.2 >>>>>>>>>> CentOS 6 (3.10.69-1) >>>>>>>>>> >>>>>>>>>> The Ceph status says OPS are blocked , i have tried checking , >>>>>>>>>> what all i know >>>>>>>>>> >>>>>>>>>> - System resources ( CPU , net, disk , memory ) -- All normal >>>>>>>>>> - 10G network for public and cluster network -- no saturation >>>>>>>>>> - Add disks are physically healthy >>>>>>>>>> - No messages in /var/log/messages OR dmesg >>>>>>>>>> - Tried restarting OSD which are blocking operation , but no >>>>>>>>>> luck >>>>>>>>>> - Tried writing through RBD and Rados bench , both are giving >>>>>>>>>> same problemm >>>>>>>>>> >>>>>>>>>> Please help me to fix this problem. >>>>>>>>>> >>>>>>>>>> # rados bench -p rbd 60 write >>>>>>>>>> Maintaining 16 concurrent writes of 4194304 bytes for up to 60 >>>>>>>>>> seconds or 0 objects Object prefix: >>> benchmark_data_stor1_1791844 >>>>>>>>>> sec Cur ops started finished avg MB/s cur MB/s last lat avg lat >>>>>>>>>> 0 0 0 0 0 0 - 0 >>>>>>>>>> 1 16 125 109 435.873 436 0.022076 0.0697864 >>>>>>>>>> 2 16 139 123 245.948 56 0.246578 0.0674407 >>>>>>>>>> 3 16 139 123 163.969 0 - 0.0674407 >>>>>>>>>> 4 16 139 123 122.978 0 - 0.0674407 >>>>>>>>>> 5 16 139 123 98.383 0 - 0.0674407 >>>>>>>>>> 6 16 139 123 81.9865 0 - 0.0674407 >>>>>>>>>> 7 16 139 123 70.2747 0 - 0.0674407 >>>>>>>>>> 8 16 139 123 61.4903 0 - 0.0674407 >>>>>>>>>> 9 16 139 123 54.6582 0 - 0.0674407 >>>>>>>>>> 10 16 139 123 49.1924 0 - 0.0674407 >>>>>>>>>> 11 16 139 123 44.7201 0 - 0.0674407 >>>>>>>>>> 12 16 139 123 40.9934 0 - 0.0674407 >>>>>>>>>> 13 16 139 123 37.8401 0 - 0.0674407 >>>>>>>>>> 14 16 139 123 35.1373 0 - 0.0674407 >>>>>>>>>> 15 16 139 123 32.7949 0 - 0.0674407 >>>>>>>>>> 16 16 139 123 30.7451 0 - 0.0674407 >>>>>>>>>> 17 16 139 123 28.9364 0 - 0.0674407 >>>>>>>>>> 18 16 139 123 27.3289 0 - 0.0674407 >>>>>>>>>> 19 16 139 123 25.8905 0 - 0.0674407 >>>>>>>>>> 2015-09-07 15:54:52.694071min lat: 0.022076 max lat: 0.46117 avg >>> lat: >>>>> 0.0674407 >>>>>>>>>> sec Cur ops started finished avg MB/s cur MB/s last lat avg lat >>>>>>>>>> 20 16 139 123 24.596 0 - 0.0674407 >>>>>>>>>> 21 16 139 123 23.4247 0 - 0.0674407 >>>>>>>>>> 22 16 139 123 22.36 0 - 0.0674407 >>>>>>>>>> 23 16 139 123 21.3878 0 - 0.0674407 >>>>>>>>>> 24 16 139 123 20.4966 0 - 0.0674407 >>>>>>>>>> 25 16 139 123 19.6768 0 - 0.0674407 >>>>>>>>>> 26 16 139 123 18.92 0 - 0.0674407 >>>>>>>>>> 27 16 139 123 18.2192 0 - 0.0674407 >>>>>>>>>> 28 16 139 123 17.5686 0 - 0.0674407 >>>>>>>>>> 29 16 139 123 16.9628 0 - 0.0674407 >>>>>>>>>> 30 16 139 123 16.3973 0 - 0.0674407 >>>>>>>>>> 31 16 139 123 15.8684 0 - 0.0674407 >>>>>>>>>> 32 16 139 123 15.3725 0 - 0.0674407 >>>>>>>>>> 33 16 139 123 14.9067 0 - 0.0674407 >>>>>>>>>> 34 16 139 123 14.4683 0 - 0.0674407 >>>>>>>>>> 35 16 139 123 14.0549 0 - 0.0674407 >>>>>>>>>> 36 16 139 123 13.6645 0 - 0.0674407 >>>>>>>>>> 37 16 139 123 13.2952 0 - 0.0674407 >>>>>>>>>> 38 16 139 123 12.9453 0 - 0.0674407 >>>>>>>>>> 39 16 139 123 12.6134 0 - 0.0674407 >>>>>>>>>> 2015-09-07 15:55:12.697124min lat: 0.022076 max lat: 0.46117 avg >>> lat: >>>>> 0.0674407 >>>>>>>>>> sec Cur ops started finished avg MB/s cur MB/s last lat avg lat >>>>>>>>>> 40 16 139 123 12.2981 0 - 0.0674407 >>>>>>>>>> 41 16 139 123 11.9981 0 - 0.0674407 >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> cluster 86edf8b8-b353-49f1-ab0a-a4827a9ea5e8 >>>>>>>>>> health HEALTH_WARN >>>>>>>>>> 1 requests are blocked > 32 sec monmap e3: 3 mons at >>>>>>>>>> {stor0111=10.100.1.111:6789/0,stor0113=10.100.1.113:6789/0,stor0 >>>>>>>>>> 11 >>>>>>>>>> 5=10.100.1.115:6789/0} >>>>>>>>>> election epoch 32, quorum 0,1,2 >>>>>>>>>> stor0111,stor0113,stor0115 osdmap e19536: 50 osds: 50 up, 50 in >>>>>>>>>> pgmap v928610: 2752 pgs, 9 pools, 30476 GB data, 4183 kobjects >>>>>>>>>> 91513 GB used, 47642 GB / 135 TB avail >>>>>>>>>> 2752 active+clean >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Tried using RBD >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> # dd if=/dev/zero of=file1 bs=4K count=10000 oflag=direct >>>>>>>>>> 10000+0 records in >>>>>>>>>> 10000+0 records out >>>>>>>>>> 40960000 bytes (41 MB) copied, 24.5529 s, 1.7 MB/s >>>>>>>>>> >>>>>>>>>> # dd if=/dev/zero of=file1 bs=1M count=100 oflag=direct >>>>>>>>>> 100+0 records in >>>>>>>>>> 100+0 records out >>>>>>>>>> 104857600 bytes (105 MB) copied, 1.05602 s, 9.3 MB/s >>>>>>>>>> >>>>>>>>>> # dd if=/dev/zero of=file1 bs=1G count=1 oflag=direct >>>>>>>>>> 1+0 records in >>>>>>>>>> 1+0 records out >>>>>>>>>> 1073741824 bytes (1.1 GB) copied, 293.551 s, 3.7 MB/s ]# >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> _______________________________________________ >>>>>>>>>> ceph-users mailing list >>>>>>>>>> >>>>>>>>>> ceph-users@xxxxxxxxxxxxxx >>>>>>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>>>>>>> >>>>>>>>> >>>>>>>>> >>>>>>>>> _______________________________________________ >>>>>>>>> ceph-users mailing list >>>>>>>>> ceph-users@xxxxxxxxxxxxxx >>>>>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> ceph-users mailing list >>>>>>>> ceph-users@xxxxxxxxxxxxxx >>>>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>>>>> >>>>>> >>>>>> _______________________________________________ >>>>>> ceph-users mailing list >>>>>> ceph-users@xxxxxxxxxxxxxx >>>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>>> >>>>> _______________________________________________ >>>>> ceph-users mailing list >>>>> ceph-users@xxxxxxxxxxxxxx >>>>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >>>> >>>> >>>> >>>> >>> >>> _______________________________________________ >>> ceph-users mailing list >>> ceph-users@xxxxxxxxxxxxxx >>> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com >> >> >> >> > > _______________________________________________ > ceph-users mailing list > ceph-users@xxxxxxxxxxxxxx > http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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