81 lines
3.1 KiB
Plaintext
81 lines
3.1 KiB
Plaintext
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# LTO Backup Scripts
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Scripts to help me perform my backups to Ultrium LTO tapes.
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## Movies Library
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* `mkbak_media.sh`: Incremental subdirectory backup. Take each directory in my cwd, tar it, and append it to tape, one tape entry per directory. Create / extend a CSV index denoting when and to what tape ID the backup was made. Do not backup directories that were already backed up to other media (using the index). Note: Changes in directories will not be detected. The directory name is the only clue.
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# LTO Notes
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## General stuff
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* dev/nst does not auto-rewind, dev/st does
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* use mt-st seek / tell to position the tape at block indexes
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* Remaining capacity: https://serverfault.com/questions/853302/determine-remaining-capacity-of-lto-tape
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* `sg_logs -a $DEV | sed -n 's/\s*Main partition remaining capacity (in MiB):\s*\(.*\)/\1/p'`
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* Disable compression: `mt-st -f /dev/nst0 compression 0`
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* Make seek/tell work: `mt-st -f /dev/nst0 stsetoptions scsi2logical`
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## Improve start/stop
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If you have a slow source / destination, consider using mbuffer with a size of a couple of Gigs. But that might also break speed matching, causing start / stop rather than going slower... idk.
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## Backups
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### Encrypted tar using GPG
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`tar cvO --exclude dir/excludeme dir/ | gpg --encrypt --sign --default-key KEY-ID -r KEY-ID -z 0 dd of=/dev/nst0 bs=512k`
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To decrypt, simply use `gpg --decrypt /dev/nst0`
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# LTFS on LTO-6
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My drives are a little weird, to get it to work I need to edit LTFS sources.
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`ltfs-2.4.3.1-10461/src/tape_drivers/linux/sg/sg_tape.c`: Type is incorrectly auto detected, we need to always `/* Use LogPage 0x31 */`
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See this patch for inspiration
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```
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diff --git a/src/tape_drivers/linux/sg/sg_tape.c b/src/tape_drivers/linux/sg/sg_tape.c
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index f583079..1169e44 100644
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--- a/src/tape_drivers/linux/sg/sg_tape.c
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+++ b/src/tape_drivers/linux/sg/sg_tape.c
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@@ -513,6 +513,12 @@ static int _raw_open(struct sg_data *priv)
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return -EDEV_DEVICE_UNSUPPORTABLE; /* Unsupported device */
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}
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+ /* Special care about Quantum model B */
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+ if (priv->vendor == VENDOR_QUANTUM) {
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+ if (id_data.product_id[7] == ' ')
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+ priv->vendor = VENDOR_QUANTUM_B;
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+ }
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+
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if (priv->drive_serial[0]) {
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/* if serial number is already set, compare it */
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if (strcmp(priv->drive_serial, id_data.unit_serial)) {
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@@ -2969,7 +2975,8 @@ int sg_remaining_capacity(void *device, struct tc_remaining_cap *cap)
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memset(buffer, 0, LOGSENSEPAGE);
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if ((IS_LTO(priv->drive_type) && (DRIVE_GEN(priv->drive_type) == 0x05)) ||
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- (priv->vendor == VENDOR_HP && IS_LTO(priv->drive_type) && (DRIVE_GEN(priv->drive_type) == 0x06))) {
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+ (priv->vendor == VENDOR_HP && IS_LTO(priv->drive_type) && (DRIVE_GEN(priv->drive_type) == 0x06)) ||
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+ (priv->vendor == VENDOR_QUANTUM_B && IS_LTO(priv->drive_type))) {
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/* Use LogPage 0x31 */
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ret = sg_logsense(device, (uint8_t)LOG_TAPECAPACITY, (uint8_t)0, (void *)buffer, LOGSENSEPAGE);
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diff --git a/src/tape_drivers/tape_drivers.h b/src/tape_drivers/tape_drivers.h
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index a9d7bf5..6e11771 100644
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--- a/src/tape_drivers/tape_drivers.h
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+++ b/src/tape_drivers/tape_drivers.h
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@@ -178,6 +178,7 @@ enum {
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VENDOR_IBM,
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VENDOR_HP,
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VENDOR_QUANTUM,
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+ VENDOR_QUANTUM_B,
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};
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enum {
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```
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