[DRBD-user] Odd observation when sync'ing

Lee Christie Lee at titaninternet.co.uk
Thu Jul 3 14:24:32 CEST 2008

Note: "permalinks" may not be as permanent as we would like,
direct links of old sources may well be a few messages off.


Two identical storage boxes, each with a 6 disk RAID10 carrying 8 drbd
resources

Doing a sync :

Device:            tps    kB_read/s    kB_wrtn/s    kB_read    kB_wrtn
sda              18.96         0.00         9.48          0         47
sdb            8097.60         0.00    309429.14          0    1550240
dm-0           1157.29         0.00     37033.13          0     185536
dm-1           1518.16         0.00     48581.24          0     243392
dm-2           1683.83         0.00     53882.63          0     269952
dm-3            180.04         0.00      5761.28          0      28864
dm-4           1839.32         0.00     58858.28          0     294880
dm-5           1572.46         0.00     50318.56          0     252096
dm-6           1466.87         0.00     46939.72          0     235168
dm-7            217.96         0.00      6974.85          0      34944

Odd how two of the drbd resources are simply not getting a look in when
it comes to I/O.

This is backed up by the output from drbd :

[root at mail-storage-02 network-scripts]# cat /proc/drbd
version: 8.2.6 (api:88/proto:86-88)
GIT-hash: 3e69822d3bb4920a8c1bfdf7d647169eba7d2eb4 build by
buildsvn at c5-x8664-build, 2008-06-26 19:33:19
 0: cs:SyncTarget st:Secondary/Primary ds:Inconsistent/UpToDate C r---
    ns:0 nr:27112032 dw:27111648 dr:0 al:0 bm:1655 lo:13 pe:8777 ua:12
ap:0 oos:65744672
	[====>...............] sync'ed: 29.3% (64203/90680)M
	finish: 0:19:01 speed: 57,472 (39,808) K/sec
 1: cs:SyncTarget st:Secondary/Primary ds:Inconsistent/UpToDate C r---
    ns:0 nr:32451072 dw:32450560 dr:0 al:0 bm:1982 lo:16 pe:1429 ua:16
ap:0 oos:60848128
	[=====>..............] sync'ed: 34.8% (59422/91112)M
	finish: 0:15:50 speed: 63,840 (47,648) K/sec
 2: cs:SyncTarget st:Secondary/Primary ds:Inconsistent/UpToDate C r---
    ns:0 nr:33048608 dw:33047904 dr:0 al:0 bm:2017 lo:22 pe:1363 ua:22
ap:0 oos:69241504
	[=====>..............] sync'ed: 32.4% (67618/99892)M
	finish: 0:17:16 speed: 66,752 (48,528) K/sec
 3: cs:SyncTarget st:Secondary/Primary ds:Inconsistent/UpToDate C r---
    ns:0 nr:5674112 dw:5674048 dr:0 al:0 bm:348 lo:2 pe:2323 ua:2 ap:0
oos:83712960
	[>...................] sync'ed:  6.4% (81750/87292)M
	finish: 4:09:08 speed: 5,280 (8,328) K/sec
 4: cs:SyncTarget st:Secondary/Primary ds:Inconsistent/UpToDate C r---
    ns:0 nr:36427744 dw:36425376 dr:0 al:0 bm:2228 lo:74 pe:1193 ua:74
ap:0 oos:29073760
	[==========>.........] sync'ed: 55.7% (28392/63964)M
	finish: 0:05:56 speed: 81,280 (53,488) K/sec
 5: cs:SyncTarget st:Secondary/Primary ds:Inconsistent/UpToDate C r---
    ns:0 nr:32996256 dw:32995712 dr:0 al:0 bm:2018 lo:17 pe:1381 ua:17
ap:0 oos:32958080
	[=========>..........] sync'ed: 50.1% (32185/64408)M
	finish: 0:07:27 speed: 73,248 (48,448) K/sec
 6: cs:SyncTarget st:Secondary/Primary ds:Inconsistent/UpToDate C r---
    ns:0 nr:32899328 dw:32898784 dr:0 al:0 bm:2011 lo:17 pe:1351 ua:17
ap:0 oos:42127648
	[=======>............] sync'ed: 43.9% (41140/73268)M
	finish: 0:09:48 speed: 71,520 (48,308) K/sec
 7: cs:SyncTarget st:Secondary/Primary ds:Inconsistent/UpToDate C r---
    ns:0 nr:5655712 dw:5654816 dr:0 al:0 bm:346 lo:28 pe:2398 ua:28 ap:0
oos:84911840
	[>...................] sync'ed:  6.3% (82921/88444)M
	finish: 14:44:29 speed: 1,536 (8,300) K/sec

Odd ?

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