Hello,
We've set up a local replication between two zsan storages over direct 1 Gb
connection
/dev/rdsk/c3t0d0s0 -> zsanback.local:/dev/rdsk/c3t0d0s0
{6 more}
/dev/rdsk/c3t7d0s0 -> zsanback.local:/dev/rdsk/c3t7d0s0
There is a zfs filesystem being accessed with iscsi. Recently users started to
complain about delays in accessing files.
Can somebody look into this magic number and explain why async_throttle_delay
slowly grows over the time
and if might be related to the delays?
#kstat sndr:1:setinfo 15 | grep async_throttle_delay
async_throttle_delay 17232313
async_throttle_delay 17235445
async_throttle_delay 17235445
async_throttle_delay 17240204
async_throttle_delay 17240204
async_throttle_delay 17245600
async_throttle_delay 17245600
async_throttle_delay 17251474
async_throttle_delay 17251474
async_throttle_delay 17257441
# kstat sndr:1:setinfo
module: sndr instance: 1
name: setinfo class: storedge
async_block_hwm 21069
async_item_hwm 2439
async_queue_blocks 17982
async_queue_items 215
async_queue_type memory
async_throttle_delay 17271404
autosync 0
bitmap /dev/md/rdsk/bmp1
bitsset 332
bmpflags 0
bmp_size 5713920
crtime 1301557.77839719
disk_status 0
flags 6150
if_down 0
if_rpc_version 7
maxqfbas 16384
maxqitems 4096
primary_host mainzsan.local
primary_vol /dev/rdsk/c3t1d0s0
secondary_host zsanback.local
secondary_vol /dev/rdsk/c3t1d0s0
snaptime 2247328.51220685
syncflags 0
syncpos 2925489887
type_flag 5
volsize 2925489887
About this values:
maxqfbas 16384
maxqitems 4096
If I setup them with higher values then I will see increase in async_block_hwm
and async_item_hwm respectively.
Does it make sense to change them with 1G local connection?
Typical load is about 5Mb/s reading/writing and sometimes it goes up to 40Mb/s
Right now I can't see relationship between zpool I/O load spikes and access
delays.
--
Best regards,
Roman Naumenko
Network Administrator
[email protected]
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