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October 15th, 2025 19:37
Windows 11 24H2 and 25H2 Small file copy performance issues with Isilon H400 and H500 clusters
As the title suggests, we have an issue with Windows 11 24H2 and 25H2 Small file copy performance issues with Isilon H400 and H500 clusters. Even on the LAN, we are seeing 35 files @ 20MB take 20 seconds or longer to transfer, and 5+ minutes when on the WAN in other locations, irrespective of latency or location. Has anyone else seen this? How did you resolve your issue, if so? Or, any tips to narrow down the root cause? We've spent a lot of time changing settings, checking Wireshark logs etc... and have come up empty handed thus far. Earlier versions of Windows and Server seem to work fine. Also, copies from our Win11 devices work just fine with other Windows-based machines when performing copies.
Phil.Lam
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October 15th, 2025 20:19
@JMACND ,
please create SR so Dell support can investigate.
JMACND
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October 15th, 2025 20:33
@Phil.Lam Been there, done that, and they are looking at logs, but they keep sending an article that claims SMB overhead for small files is "normal." Right, it is, but that's not the case with our performance issues. We're seeing excessively long copy and save times, and it's worse for WAN users.
Phil.Lam
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October 15th, 2025 20:45
@JMACND,
are you using L3 or metadata read / write for SSDs? I prefer metadata read/write for performance.
https://infohub.delltechnologies.com/sv-se/l/dell-powerscale-solution-design-and-considerations-for-smb-environments-2/performance-906/
Figure 6. Comparison of L3 cache and other SSD usage strategies.
You may need to select different SSD strategy based on the workload. For most of workflows with write component, it is recommended to select Metadata Read/Write SmartPools SSD option. For repeated random read workloads, the recommendation is to use L3 cache and you will observe latency reduced. Figure 7 shows the decision tree of various (non-L3 cache) SmartPools SSD options, and their requirements and dependencies.
JMACND
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October 15th, 2025 21:39
@Phil.Lam Thank you for this information. We do not have a license for Smart Pools, so we aren't leveraging that functionality...
Phil.Lam
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October 15th, 2025 23:13
@JMACND ,
Does the decision tree all end in Licensed Smartpools?
JMACND
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October 16th, 2025 12:07
@Phil.Lam Here's our current strategy, I think...
Phil.Lam
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October 16th, 2025 15:16
@JMACND,
check what the nodepools are on now, L3 ? You have to convert the cache SSD L3 -> storage first before using metadata read / write
isi storagepool nodepools list
isi storagepool nodepools view <h400.../h500...>
(edited)