Date: Mon, 5 Jul 2021 15:30:43 +0100 From: Pete French <petefrench@ingresso.co.uk> To: Stefan Esser <se@freebsd.org> Cc: FreeBSD Stable Mailing List <freebsd-stable@freebsd.org> Subject: Re: ZFS + mysql appears to be killing my SSD's Message-ID: <9c71d627-55b8-2464-6cc9-489e4ce98049@ingresso.co.uk> In-Reply-To: <2fd9b7e4-dc75-fedc-28d7-b98191167e6b@freebsd.org> References: <89c37c3e-22e8-006e-5826-33bd7db7739e@ingresso.co.uk> <2fd9b7e4-dc75-fedc-28d7-b98191167e6b@freebsd.org>
next in thread | previous in thread | raw e-mail | index | archive | help
On 05/07/2021 14:37, Stefan Esser wrote: > Hi Pete, > > have you checked the drive state and statistics with smartctl? Hi, thanks for the reply - yes, I did check the statistics, and they dont make a lot of sense. I was just looking at them again in fact. So, one of the machines that we chnaged a drive on when this first started, which was 4 weeks ago. root@telehouse04:/home/webadmin # smartctl -a /dev/ada0 | grep Perc 169 Remaining_Lifetime_Perc 0x0000 082 082 000 Old_age Offline - 82 root@telehouse04:/home/webadmin # smartctl -a /dev/ada1 | grep Perc 202 Percent_Lifetime_Remain 0x0030 100 100 001 Old_age Offline - 0 Now, from that you might think the 2nd drive was the one changes, but no. Its the first one, which is now at 82% lifetime remaining! The other druve, still at 100%, has been in there a year. The drives are different manufacturers, which makes comparing most of the numbers tricky unfortunately. Am now even more worried than when I sent the first email - if that 18% is accurate then I am going to be doing this again in another 4 months, and thats not sustainable. It also looks as if this problem has got a lot worse recently. Though I wasnt looking at the numbers before, only noticing tyhe failurses. If I look at 'Percentage Used Endurance Indicator' isntead of the 'Percent_Lifetime_Remain' value then I see some of those well over 200%. That value is, on the newer drives, 100 minus the 'Percent_Lifetime_Remain' value, so I guess they ahve the same underlying metric. I didnt mention in my original email, but I am encrypting these with geli. Does geli do any write amplification at all ? That might explain the high write volumes... -pete.
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?9c71d627-55b8-2464-6cc9-489e4ce98049>