libnvme(9)

💜 libnvme(9) — bestie's field guide

okay so we're deep in the API Manual for libnvme, and today's main character is a struct. yes, a struct. and honestly? she's lowkey iconic. this is struct nvme_ana_group_desc, aka the ANA Group Descriptor — the little record that tells you about one Asymmetric Namespace Access group and which namespaces are chilling in it. no cap, if you're poking at NVMe multipath stuff, you're gonna meet her. 🎀

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✨ NAME ✨

struct nvme_ana_group_desc — the ANA Group Descriptor. that's it, that's the whole vibe. 🦋

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🌸 SYNOPSIS 🌸

here's the shape of her, fr fr — every field, exactly as it lives in the header:

struct nvme_ana_group_desc {
    __le32 grpid;
    __le32 nnsids;
    __le64 chgcnt;
    __u8 state;
    __u8 rsvd17[15];
    __le32 nsids[];
 };

look at that little flexible array member at the end. she's giving ✨*dynamic*✨. 💅

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🫶 Members 🫶

• grpid — the ANA group id. this is her government name, the number that says which ANA group we're talking about. 💖
• nnsids — number of namespaces in nsids. think of it as the headcount for the guest list, bestie. 📋
• chgcnt — change counter. it goes up when stuff about this group changes, so you can tell if you're looking at stale tea. 🔥
• state — the ANA state. this is the mood ring of the group, iykyk. 🌈
• rsvd17 — reserved. hands off, bestie, that space is not yours. 🙈
• nsids — list of namespaces. the actual squad that's in this group, all lined up. 👑

ngl, rsvd17 is reserved for a reason — don't go filling it with your own lore just because it looks empty. that's not it. 💀

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and that's the whole page, bestie — no surprises, no hidden fields, just a clean little descriptor doing her thing. slay. ⭐

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sign-off szn 🎀 — this was struct nvme_ana_group_desc out of the libnvme API Manual, version libnvme(9), dated October 2026. go forth and read your ANA groups responsibly. 💜🦋