Date: Mon, 7 Dec 2015 14:45:17 -0700 From: Scott Long <scott4long@yahoo.com> To: prateek sethi <prateekrootkey@gmail.com> Cc: freebsd-scsi@freebsd.org Subject: Re: bad disk discovery Message-ID: <6A7832F8-53EB-4641-8EF6-E0E6175EB52D@yahoo.com> In-Reply-To: <CABD8d0rTD2Fu9QsqLKREBcA-nndQrUH8F8DWrPh_KQB64qjy1Q@mail.gmail.com> References: <CABD8d0rTD2Fu9QsqLKREBcA-nndQrUH8F8DWrPh_KQB64qjy1Q@mail.gmail.com>
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Hi, If your situation is accurate and the disk is not responding properly to = regular commands then it=E2=80=99s unlikely that it will respond to SMART = commands either. Sometimes these situations are caused by a bad cable, bad controller, or buggy software/firmware, and only rarely will the standard statistics in = SMART pick up these kinds of errors. SMART is better at tracking wear rates = and error rates on the physical media, both HDD and SSD, but even then = it=E2=80=99s hard for it to be accurately predictive or even accurately diagnostic. For = your case, I recommend that you describe your hardware and software configuration = in more detail, and look for physical abnormalities in the cabling and = connections. Once that is ruled and and the rest of us know what kind of hardware = you=E2=80=99re dealing with, we might be able to make better commendations. Scott > On Dec 7, 2015, at 11:07 AM, prateek sethi <prateekrootkey@gmail.com> = wrote: >=20 > Hi , >=20 > Is there any way or tool to find out that a disk which is not = responding > properly is really bad or not? Sometimes I have seen that there is lot = of > CDB error for a drive and system reboot makes every thing fine. What = can be > reasons for such kind of scenarios? >=20 > I know smartctl is the one which can help. I have some couple of = question > regarding this . >=20 > 1. What if disk does not support smartctl? > 2. How I can do smartest use of smartctl command like which parameters = can > tell that the disk is actually bad? > 3. What other test I can perform to make it sure that disk has = completely > gone? >=20 >=20 > Please tell me correct place to ask this question if I am asking at = wrong > place. > _______________________________________________ > freebsd-scsi@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-scsi > To unsubscribe, send any mail to = "freebsd-scsi-unsubscribe@freebsd.org"
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