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3397
July 22nd, 2019 06:00
Poor performance for sequential write - ME4024 hybrid config
Hi,
I just configured a new ME4024 with a hybrid flash configuration (12 SSD + 24 SAS 10k) with RAID ADAPT, two tier configuration (Performance + standard tier)
Running random writes is giving a good/expected performance (+/- 600MB/s), but for sequential writes the performance is not quite good (+/- 150MB/s maximum).
For example, using storage migration inside vmware for a datastore residing on this ME4024 is not exceding 80/90 mb/s for data transfering (vmdk's), making tests with "dd" inside a VM linux residing inside a Datastore of this enclosure, no giving more than 150MB's of throughput.
Any clue how can I improve the sequential write performance? I already tried to reformat the storage using RAID5 or RAID6, and the results are quite similar..
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DMONTAGNA
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July 22nd, 2019 07:00
Just to clarify it better!! If a write a small file (like 100Mb or less) the throughput performance is around 600/700Mb/s, if I write larger files (500Mb /1G or above it) the performance drops to no more than 100/150Mb/s. I think if could be a cache issue with ME4024? may I should change the write cache method (write-through/back) to improve this performance or it's by design on a ME4 series ?
I was really expecting a better write performance for this configuration, using 12 SSD should give a better write performance!!!
Virtual G
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August 19th, 2020 17:00
Hello,
We are experiencing something very similar. Speeds start at 6-800MB/s and then after a short period of time they drop down very low, stay there for a while (5-15 seconds) but then climb back up again.
It feels like some sort of caching issue.
Did you find any solution?.
petrf
26 Posts
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July 2nd, 2021 04:00
Hello,
Did you solve the problem with poor performance, please? We have very similar behavior on ME4012.
Thank you very much
Petr Faltyn
jaccog
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November 26th, 2021 05:00
Same problem here.
Did anyone find a solution for this?
Thanks!
maa1
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January 26th, 2022 02:00
Maybe you are using slow SSD with small SLC cache? like this https://www.techpowerup.com/review/crucial-bx500-480-gb/8.html
Try remove all SSD, or replace SSD to fast write-intensive SSD.