Hi,
I saw your discussion about parsing the output of "zpool status" to find out
what devices a zpool needs.
I think parsing the output of "zpool list -PvHp" might be less error-prone.
This is a complex example:
# zpool list -PvHp
backup 1924145348608 1671564828672 252580519936 - 64 86
1.55 ONLINE -
/dev/disk/by-serial/MN1220FA057Y6D_2000TB_hdd-part5 1924145348608
1671564828672 252580519936 - 64 86
cache - - - - - -
/dev/disk/by-serial/S2R6NX0J725133M_250GB_ssd-part5 21337997312
5375048192 15962949120 - 0 25
/dev/disk/by-serial/S2R6NX0J725688Z_250GB_ssd-part5 21337997312
5703546880 15634450432 - 0 26
ssd 35701915648 19918471168 15783444480 - 81 55
1.00 ONLINE -
mirror 35701915648 19918471168 15783444480 - 81
55
/dev/disk/by-id/wwn-0x5002538d421a92fb-part7 - - -
- - -
/dev/disk/by-id/wwn-0x5002538d421a95b7-part7 - - -
- - -
spare - - - - - -
/dev/disk/by-id/wwn-0x5000cca36ac1fa2d-part4 - - -
- - -
/dev/disk/by-id/wwn-0x5000cca36ac232e8-part4 - - -
- - -
/dev/disk/by-id/wwn-0x5000cca36ac24219-part4 - - -
- - -
/dev/disk/by-id/wwn-0x5000cca36ac263ab-part4 - - -
- - -
zroot 1924145348608 1818994868224 105150480384 - 69 94
1.78 ONLINE -
mirror 1924145348608 1818994868224 105150480384 - 69
94
/dev/sdb5 - - - - - -
/dev/sdd5 - - - - - -
/dev/sde5 - - - - - -
log - - - - - -
mirror 503316480 5541888 497774592 - 10 1
/dev/sda3 - - - - - -
/dev/sdc3 - - - - - -
cache - - - - - -
/dev/sda6 42944954368 20906727936 22038226432 -
0 48
/dev/sdc6 42944954368 21442340352 21502614016 -
0 49
Lines with a non-tab at the beginning of the line are pool names or "cache"
or "log" or "spare". Lines that start with a tab introduce member devices
(vdevs), which are either a path to a device or a special string like
"mirror" or "raidz".
To find what devices are needed for the rootfs and swap, you'd read this
list until you find the name of the root pool, then grab the 2nd field of
all lines that start with '\t/' (with TAB as the field separator) until
either EOF or a new pool name is read. This includes spares, but that's as
it should be.
If you also pass in the -L option to 'zpool list', it automatically follows
symlinks in device names.
You can also pass it the name of a pool, and then it'll only list that pool;
e.g.
# zpool list -PvHp gehenna
gehenna 231928233984 169009733632 62918500352 - 59 72
1.00 ONLINE -
/dev/mapper/crypt_sda4 231928233984 169009733632 62918500352
- 59 72
That said, I'm not sure it's worth the effort to support zfs fully
automatically.
I hope this helps.
Best regards,
András
--
The 'S' in 'IoT' stands for Security.
