lsm_volum...cy_update(3)

✨ lsm_volume_write_cache_policy_update — the glow-up your volume's write cache deserves ✨

okay bestie, sit down, because we're talking about the Libstoragemgmt C API Manual and specifically that one function that changes the RAM write cache policy of the volume you picked out. yes, that one. 💅

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🌸 NAME 🌸

lsm_volume_write_cache_policy_update — change the RAM write cache policy of the specified volume, no cap 💖

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🦋 SYNOPSIS 🦋

int lsm_volume_write_cache_policy_update (lsm_connect *conn, lsm_volume
*volume, uint32_t wcp, lsm_flag flags);

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🎀 ARGUMENTS 🎀

• conn — a valid lsm_connect pointer. like, it has to actually be valid, okay? 🙈
• volume — a single lsm_volume. one. just the one. main character volume energy only 👑
• wcp — a uint32_t, aka the write cache policy. the valid values are, and I'm being so fr right now:
  • LSM_VOLUME_WRITE_CACHE_POLICY_WRITE_BACK — switch it to write back mode ✨
  • LSM_VOLUME_WRITE_CACHE_POLICY_AUTO — switch it to auto mode: it uses write back mode when the battery/capacitor is healthy, otherwise it uses write through 🔋
  • LSM_VOLUME_WRITE_CACHE_POLICY_WRITE_THROUGH — switch it to write through mode 🌈
• flags — reserved for future use, so it must be LSM_CLIENT_FLAG_RSVD. don't get creative with it, bestie 💀

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⭐ VERSION ⭐

1.3 — she's been around a minute and she still eats 💅

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💜 DESCRIPTION 💜

So what does this actually do? It changes the RAM write cache policy on the specified volume. iconic behaviour, honestly.

But here's the tea, and you need to hear it:

• If LSM_CAP_VOLUME_WRITE_CACHE_POLICY_UPDATE_IMPACT_READ is supported (for example, on HPE SmartArray), then the changes you make to the write cache policy might also impact the read cache policy. sneaky little ripple effect, iykyk 😭
• If LSM_CAP_VOLUME_WRITE_CACHE_POLICY_UPDATE_WB_IMPACT_OTHER is supported (again, for example on HPE SmartArray), then changing the write cache policy to write back mode might impact other volumes in the same system. not just yours. the whole friend group. 💀

fr fr, check your capabilities before you go changing things, because the consequences are giving "group project."

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🫶 CAPABILITY 🫶

These are the capability flags in the mix:

• LSM_CAP_VOLUME_WRITE_CACHE_POLICY_UPDATE_AUTO
• LSM_CAP_VOLUME_WRITE_CACHE_POLICY_UPDATE_WRITE_BACK
• LSM_CAP_VOLUME_WRITE_CACHE_POLICY_UPDATE_WRITE_THROUGH
• LSM_CAP_VOLUME_WRITE_CACHE_POLICY_UPDATE_WB_IMPACT_OTHER
• LSM_CAP_VOLUME_WRITE_CACHE_POLICY_UPDATE_IMPACT_READ

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💖 RETURN 💖

You get LSM_ERR_OK on success, otherwise it's an error reason. the full lineup:

• LSM_ERR_OK — on success. slay 🎉
• LSM_ERR_NOT_FOUND_VOLUME — when the volume is not found. she's not here, bestie 🫠
• LSM_ERR_INVALID_ARGUMENT — when any argument is NULL or the flags are invalid. read the instructions please 😭
• LSM_ERR_NO_SUPPORT — not supported. it's giving "we don't do that here" 🙈

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🌟 SEE ALSO 🌟

okay so there's genuinely no SEE ALSO section on this page, but the whole Libstoragemgmt C API Manual is right there waiting for you, so go be nosy 🧚

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and that's the page!! brought to you by the Libstoragemgmt C API Manual, version 1.3, dated February 2026. mwah, take care of your volumes, bestie 💖✨🎀🦋🌸💅