> Roch - PAE wrote:
>>
>> Just posted:
>>
>> http://blogs.sun.com/roch/entry/nfs_and_zfs_a_fine
>
> Nice article. Now what about when we do this with more than one disk
> and compare UFS/SVM or VxFS/VxVM with ZFS as the back end - all with
> JBOD storage ?
>
> How then does ZFS compare as an NFS server ?
the following is just pitiful , SVM stripe and mirror thus :
# mount -v | grep d9
/dev/md/dsk/d9 on /export/nfs type ufs
read/write/setuid/devices/intr/largefiles/xattr/noatime/onerror=panic/dev=154000e
on Mon Jan 8 00:44:56 2007
# metastat d9
d9: Mirror
Submirror 0: d19
State: Okay
Submirror 1: d29
State: Okay
Pass: 1
Read option: roundrobin (default)
Write option: parallel (default)
Size: 213369984 blocks (101 GB)
d19: Submirror of d9
State: Okay
Size: 213369984 blocks (101 GB)
Stripe 0: (interlace: 256 blocks)
Device Start Block Dbase State Reloc Hot Spare
c0t9d0s0 0 No Okay Yes
c0t10d0s0 2889 No Okay Yes
c0t11d0s0 2889 No Okay Yes
d29: Submirror of d9
State: Okay
Size: 213369984 blocks (101 GB)
Stripe 0: (interlace: 256 blocks)
Device Start Block Dbase State Reloc Hot Spare
c0t12d0s0 0 No Okay Yes
c0t13d0s0 2889 No Okay Yes
c0t14d0s0 2889 No Okay Yes
TEST 1 ) file write.
Building file structure at /export/nfs/local_test/
This test will create 62^3 = 238328 files of
exactly 65536 bytes each. This amounts to
15,619,063,808 bytes = 14.55 GB of file data.
- - - WARNING TO USERS OF ZFS FILESYSTEMS - - -
- - - - - - - - - - - - - - - - - - - - - - -
If you have compression enabled on your ZFS based
filesystem then you will see very high numbers for
the final effective compression. This is due to
the fact that the ZFS compression algorithm is a
block based algorithm and the data written by this
code is largely repetitive in nature. Thus it will
compress better than any non-regular or random data.
- - - - - - - - - - - - - - - - - - - - - - -
- - - WARNING TO USERS OF ZFS FILESYSTEMS - - -
RT= 3489.821276 sec
238328 files avg=0.014639 sec total=3488.777365 sec io_avg=4.269547 MB/sec
TEST 2 ) file append 2048 bytes.
Appending to file structure at /export/nfs/local_test/
This test will append 2048 bytes to the files
that were created in TEST 1.
RT= 550.342414 sec
238328 files avg=0.002305 sec total=549.310531 sec io_avg=0.847398 MB/sec
TEST 3 ) file append 749 bytes
Appending to file structure at /export/nfs/local_test/
This test will append 749 bytes to the files
that were created in TEST 1.
RT = 859.041237 sec
238328 files avg=0.003599 sec total=857.776092 sec io_avg=0.198465 MB/sec
RT = 4899.253981 sec
real 1:21:39.309
user 12:53.959
sys 10:02.700
#
That really really is bad.
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