On 05/19/2015 11:42 AM, Bryn Hughes wrote: ... > recent LTO versions (5/6) you really need to make sure your disk setup > on your backup storage server is capable of keeping up with the tape > drive - most consumer hard drives top out at about 120MB/sec for > sequential reads and much less than that for random I/O (such as having > backup jobs writing to the disk at the same time as the tape drive is > reading from it)
Wow these seagate nas drives must be magic then: it's 120MB/s sequential read yet I get consistent 340MB/s sustained writes > 11-May 23:00 starfish-sd JobId 13: Despooling elapsed time = 00:02:24, > Transfer rate = 345.8 M Bytes/second ... > 12-May 12:30 starfish-sd JobId 13: Despooling elapsed time = 00:02:25, > Transfer rate = 343.4 M Bytes/second ... > 14-May 03:33 starfish-sd JobId 34: Despooling elapsed time = 00:02:27, > Transfer rate = 338.8 M Bytes/second ... > 18-May 19:49 starfish-sd JobId 57: Despooling elapsed time = 00:02:26, > Transfer rate = 341.1 M Bytes/second and so on. On software raid-5-ish (raidz1) with lz4 compression at filesystem level. How about you iostat that LTO 5/6 drive while a restore job is reading from it and a backup job is writing at the same time and then post speed comparisons? -- Dimitri Maziuk Programmer/sysadmin BioMagResBank, UW-Madison -- http://www.bmrb.wisc.edu
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