reproducible control domain hang

I configured a T2000 as described in the beginner's guide (<a href="http://www.sun.com/blueprints/0207/820-0832.pdf">http://www.sun.com/bl ueprints/0207/820-0832.pdf</a>) with the exception of the device allocated for the root disk. For that I came up with my own variant of <a href="http://unixconsole.blogspot.com/2007/04/time-to-build-guest-domain.html"& gt;http://unixconsole.blogspot.com/2007/04/time-to-build-guest-domain.html</a >.

My variant of using a file involved creating the file with mkfile on a zfs file system. That is...

<pre>

zpool create zfs mirror c1t0d0s4 c1t1d0s4

zfs create zfs/ldoms

zfs set compress=on zfs/ldoms

mkfile 32G /zfs/ldoms/root.img

</pre>

As I install Solaris in the ldom, the server (control domain) dies after extracting a few hundred megabytes of a flash archive. I have traced this down to it running out of memory.

Here's "vmstat 4" output on the control domain console:

<pre>

...

0 0 0 8636536 24776 1 70 0 0 0 0 0 0 0 0 0 1954 311 2244 0 23 76

0 0 0 8645096 22280 1 36 0 0 0 0 0 0 0 0 0 5957 370 9827 0 19 80

0 0 0 8649008 17720 1 40 0 296 313 0 44 0 0 0 0 9975 361 15877 0 24 75

0 0 0 8651104 15944 1 52 0 807 1671 0 700 0 0 0 0 10725 347 17545 0 26 74

0 0 0 8650800 18376 0 60 0 88 239 0 127 0 0 0 0 9816 391 15545 1 33 67

0 0 0 8640432 15936 0 76 0 497 3025 0 3874 0 0 0 0 11367 432 17975 0 35 65

0 0 0 8642968 17032 1 59 0 452 2028 0 842 0 0 0 0 10266 363 16127 0 27 73

kthrmemorypagedisk faultscpu

r b wswap free re mf pi po fr de sr m0 m1 m2 m1insycs us sy id

0 0 0 8644768 15744 0 56 0 387 1298 0 126 0 0 0 0 10170 330 16355 0 24 75

0 0 0 8652504 18368 1 113 0 372 2462 0 273 0 0 0 0 11171 321 18613 0 35 65

0 0 0 8652832 15720 1 134 0 411 6081 0 738 0 0 0 0 11541 332 18979 0 34 66

0 0 0 8652232 14312 1 94 0 413 1806 0 7775 0 0 0 0 10718 358 18271 0 38 62

0 0 0 8647360 12592 18 133 9 555 5176 0 17490 1 0 1 0 10394 320 16970 1 37 63

0 0 0 8645248 14408 2 73 22 486 5039 0 3111 2 1 1 0 11749 383 18336 0 40 59

2 0 43 8641800 2784 1 148 99 1070 1517 0 53982 19 9 9 5 8316 356 14226 0 43 57

0 0 116 8647032 800 1 42 127 134 312 3688 76207 14 7 7 1 2153 114 3726 0 29 71

</pre>

At this point the server froze. Note that 116 processes were swapped and the "de" column is 3688. Very bad news.

My initial thoughts were that I was running into some of the low-memory problems known to happen with the ZFS arc. This does not seem to be the case. According to mdb, the arc size is around 60 MB:

<pre>

# mdb unix.3 vmcore.3

...

> arc::print -td size

uint64_t size = 0t61455360

</pre>

The control domain is S10 11/06 + 118833-36 + those required for ldoms + many others. The ldom is in the process of being installed is booted from a S10 11/06 netinstall image (118833-33).

[3032 byte] By [mike.gerdtsa] at [2007-11-27 0:46:08]

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reproducible control domain hang

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