Chris212 wrote:
Weird...
7000s cannot use compression and all issues with 3.3.1 are mostly related to DECO volumes.
Do not understand this choice.
All
documented issues, maybe.
We went to 3.3.1 on our 7400 at the beginning of December (we were promised 64TB virtual volumes back in 2015 when we bought the thing apparently) and even though we don't use dedupe or compression, we've still had a few instances where the Windows cluster attached to the storage just... stops. It's as if the storage disappears, but from the 3PAR console, everything looks fine.
Turns out, the node has a "credit page leak" which causes some particular area of space on the node to drop to zero and it seems to silently fail and rather than failing gracefully and handing over Master Node status to another, nothing happens. Manually rebooting the nodes clears the space for a while (and is all HP have suggested - they've put on a script that monitors the nodes, but it doesn't email when it triggers an alert, so it's not overly useful at the moment), but we're waiting for Patch 21 to actually fix this.
It looks like we have a similiar issue. The performance is dropping silently to something like that (statvlun output):
03:24:20 02/03/2018 r/w I/O per second KBytes per sec Svt ms IOSz KB
VVname Cur Avg Max Cur Avg Max Cur Avg Cur Avg Qlen
42 r 762 3054 62115 186506 1.29 1.93 81.5 61.1 -
42 w 777 1056 15165 16144 0.35 0.98 19.5 15.3 -
42 t 1540 4110 77280 202649 0.82 1.68 50.2 49.3 3834
46 r 9561 4610 488341 258678 11.44 6.64 51.1 56.1 -
46 w 8602 2861 283704 80130 935.25 672.59 33.0 28.0 -
46 t 18163 7471 772045 338808 448.94 261.65 42.5 45.3 85
43 r 3805 8600 262024 335123 1.98 1.45 68.9 39.0 -
43 w 1281 4207 66943 146168 2.28 128.84 52.3 34.7 -
43 t 5086 12807 328967 481291 2.06 43.29 64.7 37.6 2271
46 r 10163 8680 399562 346879 0.87 1.42 39.3 40.0 -
46 w 9350 4513 322705 155587 588.99 160.74 34.5 34.5 -
46 t 19514 13194 722267 502466 282.68 55.92 37.0 38.1 26
After the reboot of the master node, we were back to a normal level:
46 r 26417 26417 2027177 2027177 1.55 1.55 76.7 76.7 -
46 w 9042 9042 533615 533615 0.74 0.74 59.0 59.0 -
46 t 35460 35460 2560792 2560792 1.34 1.34 72.2 72.2 32