Hi all,
I am testing different options for ZFS pools. I just created a few files to represent 800MB, 400MB, 300MB and 100MB drives using mkfiles. (think of 10 times each and that is my setup with 8TB, 4TB, 3TB and 1TB drives - although I know the manufacturers numbers are not in TB).
So I end up with this:
I add each pair of 800MB, 400MB and 300MB but I consistently get less reported in each mirror created:
With proper 800MB files acting as storage unit, why am I getting only 768MB reported as SIZE. It is consistent across all drives, I would like to understand the delta.
On a separate note, I could force add the raidz2 to the pool made of multiple mirror vdevs but I read the error message. Again if somebody can explain what could go wrong with a raidz2 combined with multiple mirrors, that would be great. I suspect this is generic warning for vdev type mismatch as you cannot lose a vdev otherwise you lose the pool.
Let me know if I have missed anything else on the last point.
I am testing different options for ZFS pools. I just created a few files to represent 800MB, 400MB, 300MB and 100MB drives using mkfiles. (think of 10 times each and that is my setup with 8TB, 4TB, 3TB and 1TB drives - although I know the manufacturers numbers are not in TB).
So I end up with this:
Code:
root@oz:~/zfstest # ls -lh
total 1152
-rw------- 1 root wheel 800M Nov 25 23:05 sd0
-rw------- 1 root wheel 800M Nov 25 23:05 sd1
-rw------- 1 root wheel 100M Nov 25 23:05 sd10
-rw------- 1 root wheel 100M Nov 25 23:05 sd11
-rw------- 1 root wheel 100M Nov 25 23:05 sd12
-rw------- 1 root wheel 100M Nov 25 23:05 sd13
-rw------- 1 root wheel 100M Nov 25 23:05 sd14
-rw------- 1 root wheel 100M Nov 25 23:05 sd15
-rw------- 1 root wheel 400M Nov 25 23:05 sd2
-rw------- 1 root wheel 400M Nov 25 23:05 sd3
-rw------- 1 root wheel 300M Nov 25 23:05 sd4
-rw------- 1 root wheel 300M Nov 25 23:05 sd5
-rw------- 1 root wheel 100M Nov 25 23:05 sd6
-rw------- 1 root wheel 100M Nov 25 23:05 sd7
-rw------- 1 root wheel 100M Nov 25 23:05 sd8
-rw------- 1 root wheel 100M Nov 25 23:05 sd9
root@oz:~/zfstest # ls -l
total 1152
-rw------- 1 root wheel 838860800 Nov 25 23:05 sd0
-rw------- 1 root wheel 838860800 Nov 25 23:05 sd1
-rw------- 1 root wheel 104857600 Nov 25 23:05 sd10
-rw------- 1 root wheel 104857600 Nov 25 23:05 sd11
-rw------- 1 root wheel 104857600 Nov 25 23:05 sd12
-rw------- 1 root wheel 104857600 Nov 25 23:05 sd13
-rw------- 1 root wheel 104857600 Nov 25 23:05 sd14
-rw------- 1 root wheel 104857600 Nov 25 23:05 sd15
-rw------- 1 root wheel 419430400 Nov 25 23:05 sd2
-rw------- 1 root wheel 419430400 Nov 25 23:05 sd3
-rw------- 1 root wheel 314572800 Nov 25 23:05 sd4
-rw------- 1 root wheel 314572800 Nov 25 23:05 sd5
-rw------- 1 root wheel 104857600 Nov 25 23:05 sd6
-rw------- 1 root wheel 104857600 Nov 25 23:05 sd7
-rw------- 1 root wheel 104857600 Nov 25 23:05 sd8
-rw------- 1 root wheel 104857600 Nov 25 23:05 sd9
I add each pair of 800MB, 400MB and 300MB but I consistently get less reported in each mirror created:
Code:
NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT
testzfs 2.28G 448K 2.28G - - 0% 0% 1.00x ONLINE -
mirror 768M 268K 768M - - 0% 0%
/root/zfstest/sd0 - - - - - - -
/root/zfstest/sd1 - - - - - - -
mirror 384M 92K 384M - - 0% 0%
/root/zfstest/sd2 - - - - - - -
/root/zfstest/sd3 - - - - - - -
mirror 288M 88K 288M - - 0% 0%
/root/zfstest/sd4 - - - - - - -
/root/zfstest/sd5 - - - - - - -
raidz2 896M 0 896M - - 0% 0%
/root/zfstest/sd6 - - - - - - -
/root/zfstest/sd7 - - - - - - -
/root/zfstest/sd8 - - - - - - -
/root/zfstest/sd9 - - - - - - -
/root/zfstest/sd10 - - - - - - -
/root/zfstest/sd11 - - - - - - -
/root/zfstest/sd12 - - - - - - -
/root/zfstest/sd13 - - - - - - -
/root/zfstest/sd14 - - - - - - -
/root/zfstest/sd15 - - - - - - -
With proper 800MB files acting as storage unit, why am I getting only 768MB reported as SIZE. It is consistent across all drives, I would like to understand the delta.
On a separate note, I could force add the raidz2 to the pool made of multiple mirror vdevs but I read the error message. Again if somebody can explain what could go wrong with a raidz2 combined with multiple mirrors, that would be great. I suspect this is generic warning for vdev type mismatch as you cannot lose a vdev otherwise you lose the pool.
Let me know if I have missed anything else on the last point.