https://wiki.geekworm.com/index.php?action=history&feed=atom&title=CommentStreams%3AA597c7174a0b7b5c258267108701ee8dCommentStreams:A597c7174a0b7b5c258267108701ee8d - Revision history2026-07-26T03:12:07ZRevision history for this page on the wikiMediaWiki 1.43.8https://wiki.geekworm.com/index.php?title=CommentStreams:A597c7174a0b7b5c258267108701ee8d&diff=34730&oldid=prevHarry: Migrated reply #52442024-10-23T11:57:55Z<p>Migrated reply #5244</p>
<p><b>New page</b></p><div>'''Formatting of the above comments:'''<br />
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In case someone battling making NAS with large NVMEs... I'm almost 100% sure that 1A@5V(5.00W) is not enough for powering them. Example below is from 4x(Shenzhen Longsys Electronics Co., Ltd. Lexar NM790 NVME SSD (DRAM-less) (rev 01)).<br />
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<pre><br />
smartctl -c /dev/nvme0<br />
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smartctl 7.4 2023-08-01 r5530 [aarch64-linux-6.11.0-1004-raspi] (local build) Copyright (C) 2002-23, Bruce Allen, Christian Franke, www.smartmontools.org<br />
START OF INFORMATION SECTION<br />
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Firmware Updates (0x14): 2 Slots, no Reset required Optional Admin Commands (0x0017): Security Format Frmw_DL Self_Test Optional NVM Commands (0x005f): Comp Wr_Unc DS_Mngmt Wr_Zero Sav/Sel_Feat Timestmp Log Page Attributes (0x0e): Cmd_Eff_Lg Ext_Get_Lg Telmtry_Lg Maximum Data Transfer Size: 128 Pages Warning Comp. Temp. Threshold: 90 Celsius Critical Comp. Temp. Threshold: 95 Celsius<br />
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Supported Power States St Op Max Active Idle RL RT WL WT Ent_Lat Ex_Lat 0 + 6.50W - - 0 0 0 0 0 0 1 + 5.80W - - 1 1 1 1 0 0 2 + 3.60W - - 2 2 2 2 0 0 3 - 0.0500W - - 3 3 3 3 5000 10000 4 - 0.0025W - - 4 4 4 4 8000 41000<br />
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Supported LBA Sizes (NSID 0x1) Id Fmt Data Metadt Rel_Perf 0 + 512 0 0<br />
</pre><br />
After 2 days battling this is a <code>partial</code> workaroung I found working almost stable using RaidZ1(in RaidZ2 setup NAS still hangs after seconds when loaded).<br />
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With this command you are saying NVME drive to use power modes <=2.<br />
nvme set-feature /dev/nvme0 --feature-id=2 --value=2<br />
You can check current power mode starus like this.<br />
nvme get-feature /dev/nvme0 -f 2 get-feature:0x02 (Power Management), Current value:0x00000004<br />
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'''<big>More info when available.</big>'''<br />
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PSU I use is 20W that I use before so it's checked. I never saw under-voltage alarm on RPI5 itself. Same four drives connected on 4x4x4x4 bifurcatated PCIe3 slot on PC are performing like a beasts. Now I'm having stable configuration using both RaidZ1 and 2 by software limiting IO bursts to drives.</div>Harry