为提高效率，请提供以下信息，问题描述清晰能够更快得到解决：
【 TiDB 使用环境】
【概述】 生产环境数据库备份，使用dumpling，出现/tmp空间不足
【备份和数据迁移策略逻辑】
/usr/bin/mysql -h172.29.1.64 -P4000 -uroot -p’password’ -e " update mysql.tidb set VARIABLE_VALUE = ‘720h’ where VARIABLE_NAME = ‘tikv_gc_life_time’"
dumpling -h 172.29.1.64 -P 4000 -u root -p ‘password’ --filetype sql --threads 32 -o $backup_dir/${cur_date} -F 256MiB
/usr/bin/mysql -h172.29.1.64 -P4000 -uroot -p’password’ -e “update mysql.tidb set VARIABLE_VALUE = ‘10m’ where VARIABLE_NAME = ‘tikv_gc_life_time’”
【背景】 dumpling备份
【现象】 备份失败，日志日式/tmp空间不足
[2021/09/13 01:03:37.267 +08:00] [INFO] [collector.go:188] [“backup Failed summary : total backup ranges: 1, total success: 0, total failed: 1”] [unitName=“dump table data”] [error=“Error 1105: write /tmp/1001_tidb/MC4wLjAuMDo0MDAwLzAuMC4wLjA6MTAwODA=/tmp-storage/chunk.ListInDisk-9558615065: no space left on device”] [errorVerbose=“Error 1105: write /tmp/1001_tidb/MC4wLjAuMDo0MDAwLzAuMC4wLjA6MTAwODA=/tmp-storage/chunk.ListInDisk-9558615065: no space left on device\ngithub.com/pingcap/errors.AddStack\
\tgithub.com/pingcap/errors@v0.11.5-0.20200917111840-a15ef68f753d/errors.go:174\
github.com/pingcap/errors.Trace\
\tgithub.com/pingcap/errors@v0.11.5-0.20200917111840-a15ef68f753d/juju_adaptor.go:15\
github.com/pingcap/dumpling/v4/export.(*tableData).Start\
\tgithub.com/pingcap/dumpling@/v4/export/ir_impl.go:97\
github.com/pingcap/dumpling/v4/export.(*Writer).WriteTableData.func1\
\tgithub.com/pingcap/dumpling@/v4/export/writer.go:179\
github.com/pingcap/br/pkg/utils.WithRetry\
\tgithub.com/pingcap/br@v0.0.0-20201119111016-600102357a27/pkg/utils/retry.go:34\
github.com/pingcap/dumpling/v4/export.(*Writer).WriteTableData\
\tgithub.com/pingcap/dumpling@/v4/export/writer.go:161\
github.com/pingcap/dumpling/v4/export.(*Writer).handleTask\
\tgithub.com/pingcap/dumpling@/v4/export/writer.go:104\
github.com/pingcap/dumpling/v4/export.(*Writer).run\
\tgithub.com/pingcap/dumpling@/v4/export/writer.go:86\
github.com/pingcap/dumpling/v4/export.(*Dumper).startWriters.func4\
\tgithub.com/pingcap/dumpling@/v4/export/dump.go:253\
golang.org/x/sync/errgroup.(*Group).Go.func1\
\tgolang.org/x/sync@v0.0.0-20200625203802-6e8e738ad208/errgroup/errgroup.go:57\
runtime.goexit\
\truntime/asm_amd64.s:1357”]
【问题】dumpling备份失败
【业务影响】
无法备份
【TiDB 版本】
v4.0.8
【附件】
- 相关日志、配置文件、Grafana 监控（https://metricstool.pingcap.com/)
- TiUP Cluster Display 信息
- TiUP CLuster Edit config 信息
- TiDB-Overview 监控
- 对应模块的 Grafana 监控（如有 BR、TiDB-binlog、TiCDC 等）
- 对应模块日志（包含问题前后 1 小时日志）
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