They should be 100% on an empty aggregate..but still, spindles seem to handle the workload just fine.

What the history of CPU on the system..when did it work well last, what was CPU load then?
 
_________________________________
Jeff Mohler
Tech Yahoo, Storage Architect, Principal
(831)454-6712
YPAC Gold Member
Twitter: @PrincipalYahoo
CorpIM:  Hipchat & Iris



On Friday, March 25, 2016 12:28 PM, josef radinger <cheese@nosuchhost.net> wrote:


performance advisor shows the following:
read latency on a vmware-datastore at around 5-20ms.
write latency at around 10-15ms with peaks:
"other" latency at up to 500ms, i'm quite sure this other is my problem.

but what me bothers is the stripe ratio: 
   2428.65 partial stripes                  85.83 full stripes
my knowledge is that i should have a lot more full stripes than partial ones.

images are at

my colleagues had troubles while patching several windows-systems residing in that datastore, as the systems got unresponsive and access got very slow.


On Fri, 2016-03-25 at 18:42 +0000, Jeffrey Mohler wrote:
Are you write latency troubled, or read latency troubled?

I don't see free space frag as a huge issue, as lightly loaded as the spindles report to be.


 
_________________________________
Jeff Mohler
Tech Yahoo, Storage Architect, Principal
Twitter: @PrincipalYahoo
CorpIM:  Hipchat & Iris



On Friday, March 25, 2016 11:37 AM, josef radinger <cheese@nosuchhost.net> wrote:


hi

i have a metro cluster (rather old) which is currently responding very
slowly. 7-mode 8.1.4

there is only one aggregate per head, filled at around 72% one one head
and 79% on the other head. attached is a statit and sysstat -x 1 
from one head.

i see lots of partial stripes and only several full stripes. i assume
this should mean not enough free space, which should imho not be a
problem at my aggregates.

what is the correct procedure for performing a free space reallocation?
i did:
* stop all volume-reallocates
* disable read_reallocation on all volumes
* raid.lost_write.enable       off
* aggr options aggr0 resyncsnaptime 5
* reallocate start -A -o aggr0
* wait for finish of reallocate
* aggr options aggr0 resyncsnaptime 60
* enable read_reallocation on all volumes
* reenable all volume-level reallocates

my aggregates have options:

aggr options aggr0
root, diskroot, nosnap=off, raidtype=raid_dp, raidsize=20, 
ignore_inconsistent=off, snapmirrored=off, resyncsnaptime=60, 
fs_size_fixed=off, snapshot_autodelete=on, lost_write_protect=on, 
ha_policy=cfo, hybrid_enabled=off, percent_snapshot_space=5%, 
free_space_realloc=off


any advice?
josef


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