Okay, checking the datasheet of the HDD, the max. cont. data rate is 180 MB/s, that's the bottle neck. I will replace it with a SAS HDD, plugged directly to the HBA.
Wolfgang, can you explain please the context between start-stop mode and the serious degradation of capacity? Thanks, Frank Frank Cherry schrieb am Dienstag, 6. April 2021 um 11:30:35 UTC+2: > My storage daemon hardware: > > Microsemi Adaptec HBA 1100 4i - Speicher-Controller - 4 Sender/Kanal - > SATA 6Gb/s / SAS 12Gb/s Low Profile - 1.2 GBps > Quantum LTO-7 HH - Bandlaufwerk - LTO Ultrium (6 TB / 15 TB) - Ultrium 7 - > SAS-2 - intern > A separate Seagate IronWolf NAS HDD 4TB, SATA 6Gb/s (ST4000VN008) is used > for spooling partition only. > > The SATA HDD is plugged on the main board's SATA Port. 300 MB/s = 2,4 > Gb/s, so the 6 Gb/s should be OK. > Taking a look to the last job: Despooling elapsed time = 03:13:27, > Transfer rate = 99.29 M Bytes/second > > Maybe a solution to plug the HDD directly to the SAS controller? > > Thanks for help Wolfgang, > Frank > wd schrieb am Dienstag, 6. April 2021 um 11:06:09 UTC+2: > >> Dear Frank, >> >> In message <[email protected]> you wrote: >> > >> > I use Ultrium 7 tapes with 6 / 15 TB storage capacity. So I do expect a >> > minimum of 6 TB in worst case (without compression). >> ... >> > When I now calclulate the present 2.55 TB + 1,2 TB in queue = 3,75 TB, >> less >> > than 6 TB for LTO-7 >> >> The spec for LTO 7 gives a sustained data rate of 300 MB/s. Check >> if your storage daemon can feed the drive with such a rate; >> otherwise the drive will run in start-stop mode which is slow, causes >> increased wear on the drive and the tapes, and results in a serious >> degradation of capacity - as you are seeing here. >> >> >> Best regards, >> >> Wolfgang Denk >> >> -- >> DENX Software Engineering GmbH, Managing Director: Wolfgang Denk >> HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany >> Phone: (+49)-8142-66989-10 <+49%208142%206698910> Fax: >> (+49)-8142-66989-80 <+49%208142%206698980> Email: [email protected] >> Living on Earth may be expensive, but it includes an annual free trip >> around the Sun. >> > -- You received this message because you are subscribed to the Google Groups "bareos-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/bareos-users/8a1afda1-c38f-4411-afb3-e642f41e9932n%40googlegroups.com.
