-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 1/20/2014 7:38 AM, CrashPlan Pro wrote: > Dan Williams wrote at 18-01-14 05:09: >> Larger systems are less likely to ever sleep. > > I have to agree with this. There is almost no storage server that > will be suspended to sleep. > > Users of storage servers rather see an improvement at reboot time. > > For example by not re-enumerating all 40 / 80 / 100 attached PuiS > ATA drives or not spinning the drive while enumerating. Only the > boot drive needs to be spin up. Currently the reboot proces does > wake each drive that was previously spun down. At a rate of 1 > concurrent drive that takes approximately 6 seconds to spin up, the > re-enumeration part takes around 8 minutes during reboot.
I wasn't thinking quite that big. I'm thinking 3 or 4 drive home NAS type systems, which people do like to make use of suspend on to save power. As for not spinning up drives during boot, the problem with that seems to be that some drives ( possibly most? ) won't return correct IDENTIFY information until they have been spun up. For systems *that* large, I'd say what they could use is for the enumeration to be somewhere in between one at a time, and all at once. The power supply on such a beast should be able to handle starting up say, 4-8 drives at once, so that would cut down on the startup time considerably. On the other hand, as long as the drives holding the root filesystem are the first to spin up, the system should boot up quickly while the other drives come up in the background. -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.17 (MingW32) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQEcBAEBAgAGBQJS3TMIAAoJEI5FoCIzSKrw5ScH/0nDSPvqrxK8r3mHwqRkLANn 5390lj8OTS7JKuR4GThOvggdBftJ+6KaPqOhZ4dw0fJSmuiB2QumO3fVGFvEpJY1 J5ZCpKhmpdxQbGQHDktjY0ImQ52elsjjGMIIj7elXhjP4UWTqcLLyozIvGVbfEUa NT3ggKHZQ5ORl25IyiL/yObgezKK1fXcltvQZd2jp47OGQgByxjsH9NrQQiNlU2o MMG8yDJA7lExuqMPm9z2OJJZuEgukPY6Y6Eg5u9rHriskvEIo/LOy+EGyAzq11tV o9LyBShnAljhCzQ+dASsdKJYqQSY7Jy5kGAsOEvifS3MRtukddmzMkf6plzwe7M= =4ab9 -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
