Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.
Hi Meji In three weeks i will have two Intel NIC X520-QDA1 of 40 Gb/s, according to these link: http://ark.intel.com/products/68672/Intel-Ethernet-Converged-Network-Adapter-X520-QDA1 http://www.intel.com/content/www/us/en/network-adapters/converged-network-adapters/ethernet-x520-qda1-brief.html In my Hardware setup also i have a RAID controller H710p of Dell (LSI chipset with 1 MB of cache) and with two groups of 4 HDDs SAS 15K RPM, each group is configured in RAID 10, this setup is applied for each Server (the HDDs for the OS are in other RAID), obviously i don't have much storage compared to yours. In these Servers i will have running DRBD 8.4.5 version If you want to know the result of my tests, only let me know. Best regards Cesar ----- Original Message ----- From: "Meij, Henk" <hmeij at wesleyan.edu> To: <drbd-user at lists.linbit.com> Sent: Thursday, October 23, 2014 5:10 PM Subject: Re: [DRBD-user] drbd storage size > a) it turns out the counter (8847740/11287100)M goes down, not up, deh, > never noticed > > b) ran plain rsync across eth0 (public, with switches/routers) and eth1 > (nic to nic) > eth0 sent 585260755954 bytes received 10367 bytes 116690412.98 bytes/sec > eth1 sent 585260755954 bytes received 10367 bytes 122580535.41 bytes/sec > so my LSI raid card is behaving and DRBD is slowing the initialization > down somehow. > Found chapter 15 and will try some suggestions but ideas welcome. > > c) for grins > version: 8.4.5 (api:1/proto:86-101) > GIT-hash: 1d360bde0e095d495786eaeb2a1ac76888e4db96 build by > mockbuild at Build64R6, 2014-08-17 19:26:04 > 0: cs:SyncTarget ro:Secondary/Secondary ds:Inconsistent/UpToDate C r----- > ns:0 nr:3601728 dw:3601408 dr:0 al:0 bm:0 lo:4 pe:11 ua:3 ap:0 ep:1 > wo:f oos:109374215324 > [>....................] sync'ed: 0.1% (106810756/106814272)M > finish: 731:23:05 speed: 41,532 (31,868) want: 41,000 K/sec > > 100TB in 731 hours would be 30 days. Can I expect large delta data > replication to go equally slow using DRDB? > > -Henk > > > > ________________________________________ > From: drbd-user-bounces at lists.linbit.com > [drbd-user-bounces at lists.linbit.com] on behalf of Meij, Henk > [hmeij at wesleyan.edu] > Sent: Thursday, October 23, 2014 9:57 AM > To: Philipp Reisner; drbd-user at lists.linbit.com > Subject: Re: [DRBD-user] drbd storage size > > Thanks for the write up y'll. I'll have to think about #3 not sure I > grasp it fully. > > Last night I started a 12 TB test and started first initialization for > observation (0 is primary). > I have node0:eth1 wired directly into node1:eth1 with 10 foot CAT 6 cable > (MTU=9000) > Data from node1 to node0 > PING 10.10.52.232 (10.10.52.232) 8970(8998) bytes of data. > 8978 bytes from 10.10.52.232: icmp_seq=1 ttl=64 time=0.316 ms > > This morning's progress report from node1:(drbd v8.4.5) > > [===>................] sync'ed: 21.7% (8847740/11287100)M > finish: 62:50:50 speed: 40,032 (39,008) want: 68,840 K/sec > > which confuses me: 8.8M out of 11.3M is 77.8% synced, not? I will let this > test finish before I do a dd attempt. > > iostat reveals %idle cpu 99%+ and little to no %iowait (near 0%), iotop > confirms very little IO (<5 K/s), typical data > Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz > avgqu-sz await svctm %util > sdb1 0.00 231.00 0.00 156.33 0.00 79194.67 506.58 > 0.46 2.94 1.49 23.37 > > Something is throttling this IO as 40M/s is about half of what I was > hoping for. Will dig some more. > > -Henk > > ________________________________________ > From: drbd-user-bounces at lists.linbit.com > [drbd-user-bounces at lists.linbit.com] on behalf of Philipp Reisner > [philipp.reisner at linbit.com] > Sent: Thursday, October 23, 2014 9:17 AM > To: drbd-user at lists.linbit.com > Subject: Re: [DRBD-user] drbd storage size > > Am Donnerstag, 23. Oktober 2014, 08:55:03 schrieb Digimer: >> On 23/10/14 04:00 AM, Philipp Reisner wrote: >> > 2a) Initialize both backend devices to a known state. >> > >> > I.e. dd if=/dev/zero of=/dev/sdb1 bs=$((1024*1024)) oflag=direct >> >> Question; >> >> What I've done in the past to speed up initial sync is to create the >> DRBD device, pause-sync, then do your 'dd if=/dev/zero ...' trick to >> /dev/drbd0. This effectively drives the resync speed to the max possible >> and ensures full sync across both nodes. Is this a sane approach? >> > > Yes, sure that is a way to do it. (I have the impression that is something > form the drbd-8.3 world.) > > I do not know from the top of the head if that will be faster than the > built-in background resync in drbd-8.4. > > Best, > Phil > > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user > _______________________________________________ > drbd-user mailing list > drbd-user at lists.linbit.com > http://lists.linbit.com/mailman/listinfo/drbd-user >