lsm_volum...icy_update(3)

✨ lsm_volume_read_cache_policy_update ✨

okay bestie, sit down, hydrate, and let me tell you about this lil function from the Libstoragemgmt C API Manual — yes, that Libstoragemgmt, the one that talks to your storage. 🫶

🌸 NAME 🌸

lsm_volume_read_cache_policy_update — Change RAM read cache policy of the specified volume

literally what it says on the tin. we're flipping the read cache switch on one very specific volume, and only that volume. main character behavior only. 👑

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💅 SYNOPSIS 💅

int lsm_volume_read_cache_policy_update (lsm_connect *conn, lsm_volume
*volume, uint32_t rcp, lsm_flag flags);

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🎀 ARGUMENTS 🎀

• conn — a valid lsm_connect pointer. gotta be a real one, no ghost connections.
• volume — Pointer of lsm_string. yes, the volume you're about to mess with. (it's giving "be normal about it".)
• rcp — uint32_t. the read cache policy. valid values are, and I quote:
  • LSM_VOLUME_READ_CACHE_POLICY_ENABLED — Enable read cache.
  • LSM_VOLUME_READ_CACHE_POLICY_DISABLED — Disable read cache.
• flags — Reserved for future use, must be LSM_CLIENT_FLAG_RSVD. it's reserved, bestie. it's not for you. not yet. 🙈

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🦋 VERSION 🦋

1.3

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💖 DESCRIPTION 💖

Change the RAM read cache policy of the specified volume. that's the whole quest. ⭐

and here's the plot twist: if LSM_CAP_VOLUME_READ_CACHE_POLICY_UPDATE_IMPACT_WRITE is supported (like on HPE SmartArray), then the changes on write cache policy might also impact read cache policy. so like… they're intertwined. lowkey entangled. the way that one thing touches another thing 😭

heads up: that impact situation is exactly why you check your capabilities before you go clicking things. no cap.

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🌈 CAPABILITY 🌈

• LSM_CAP_VOLUME_READ_CACHE_POLICY_UPDATE
• LSM_CAP_VOLUME_READ_CACHE_POLICY_UPDATE_IMPACT_WRITE

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🔥 RETURN 🔥

LSM_ERR_OK on success else error reason. and the error reasons are:

• LSM_ERR_OK — On success. (the slay. the win. the dream.)
• LSM_ERR_NOT_FOUND_VOLUME — When volume not found. she's not here, girl 💀
• LSM_ERR_INVALID_ARGUMENT — When any argument is NULL or invalid flags.
• LSM_ERR_NO_SUPPORT — Not supported. this hardware said no. respect it. 🙈

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and that's the whole page, fr fr. this was the lsm_volum...icy_update(3) page from the Libstoragemgmt C API Manual — the February 2026 edition, no less — so if you see it truncated in a terminal somewhere, now you know exactly what it was hiding. go forth and cache responsibly, bestie 💜🌸