[pbs-devel] [PATCH proxmox-backup] tape: wait for calibration of LTO-9 tapes

From: Dominik Csapak <d.csapak@proxmox.com>
To: pbs-devel@lists.proxmox.com
Subject: [pbs-devel] [PATCH proxmox-backup] tape: wait for calibration of LTO-9 tapes
Date: Tue, 15 Apr 2025 13:40:43 +0200	[thread overview]
Message-ID: <20250415114043.2389789-1-d.csapak@proxmox.com> (raw)

Since LTO-9, initial loading of tapes into a drive can block up to 2
hours according to the spec. In case we run into a ready check timeout,
query the drive, and increase the timeout to 2 hours and 5 minutes if
it's calibrating (5 minutes headroom).

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
 pbs-tape/src/sg_tape.rs | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/pbs-tape/src/sg_tape.rs b/pbs-tape/src/sg_tape.rs
index 915dee28a..3ce144ad5 100644
--- a/pbs-tape/src/sg_tape.rs
+++ b/pbs-tape/src/sg_tape.rs
@@ -662,7 +662,8 @@ impl SgTape {
     pub fn wait_until_ready(&mut self, timeout: Option<u64>) -> Result<(), Error> {
         let start = SystemTime::now();
         let timeout = timeout.unwrap_or(Self::SCSI_TAPE_DEFAULT_TIMEOUT as u64);
-        let max_wait = std::time::Duration::new(timeout, 0);
+        let mut max_wait = std::time::Duration::new(timeout, 0);
+        let mut increased_timeout = false;
 
         loop {
             match self.test_unit_ready() {
@@ -670,6 +671,16 @@ impl SgTape {
                 _ => {
                     std::thread::sleep(std::time::Duration::new(1, 0));
                     if start.elapsed()? > max_wait {
+                        if !increased_timeout {
+                            if let Ok(DeviceActivity::Calibrating) =
+                                read_device_activity(&mut self.file)
+                            {
+                                log::info!("Detected drive calibration, increasing timeout to 2 hours 5 minutes");
+                                max_wait = std::time::Duration::new(2 * 60 * 60 + 5 * 60, 0);
+                                increased_timeout = true;
+                                continue;
+                            }
+                        }
                         bail!("wait_until_ready failed - got timeout");
                     }
                 }
-- 
2.39.5



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