From: matthew patton <pattonme@yahoo.com>
To: LVM general discussion and development <linux-lvm@redhat.com>
Subject: Re: [linux-lvm] cache on SSD makes system unresponsive
Date: Sat, 21 Oct 2017 16:05:32 +0000 (UTC) [thread overview]
Message-ID: <1244564108.1073508.1508601932111@mail.yahoo.com> (raw)
In-Reply-To: 1244564108.1073508.1508601932111.ref@mail.yahoo.com
0) what is the full DD command you are issuing? (I think we have this)
1) does your DD command work when LVM is not using caching of any kind.
2) does your DD command work if using 'direct' mode
3) are you able to write smaller chunks from NON-cached LVM volume to SSD vdev? Is there an inflection point in size where it goes haywire?
4) what is your IO elevator/scheduler set to?
5) what is value of
vm.dirty_background_ratio
vm.dirty_ratio
vm.dirty_background_bytes
vm.dirty_bytes
What do you observe in /proc/vmstat during DD?
6) run DD via strace
next parent reply other threads:[~2017-10-21 16:05 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1244564108.1073508.1508601932111.ref@mail.yahoo.com>
2017-10-21 16:05 ` matthew patton [this message]
2017-10-24 18:09 ` [linux-lvm] cache on SSD makes system unresponsive Oleg Cherkasov
[not found] <640472762.2746512.1508882485777.ref@mail.yahoo.com>
2017-10-24 22:01 ` matthew patton
2017-10-24 23:10 ` Chris Friesen
[not found] <1928541660.2031191.1508802005006.ref@mail.yahoo.com>
2017-10-23 23:40 ` matthew patton
2017-10-24 15:36 ` Xen
[not found] <1714773615.1945146.1508792555922.ref@mail.yahoo.com>
2017-10-23 21:02 ` matthew patton
2017-10-23 21:54 ` Xen
2017-10-24 2:51 ` John Stoffel
[not found] <1540708205.1077645.1508602122091.ref@mail.yahoo.com>
2017-10-21 16:08 ` matthew patton
[not found] <541215543.377417.1508458336923.ref@mail.yahoo.com>
2017-10-20 0:12 ` matthew patton
2017-10-20 6:46 ` Xen
2017-10-20 9:59 ` Oleg Cherkasov
2017-10-19 17:54 Oleg Cherkasov
2017-10-19 18:13 ` Xen
2017-10-20 10:21 ` Oleg Cherkasov
2017-10-20 10:38 ` Xen
2017-10-20 11:41 ` Oleg Cherkasov
2017-10-19 18:49 ` Mike Snitzer
2017-10-20 11:07 ` Joe Thornber
2017-10-19 19:09 ` John Stoffel
2017-10-19 19:46 ` Xen
2017-10-19 21:14 ` John Stoffel
2017-10-20 6:42 ` Xen
2017-10-19 21:59 ` Oleg Cherkasov
2017-10-20 19:35 ` John Stoffel
2017-10-21 3:05 ` Mike Snitzer
2017-10-21 14:33 ` Oleg Cherkasov
2017-10-23 10:58 ` Zdenek Kabelac
2017-10-21 2:55 ` Mike Snitzer
2017-10-21 14:10 ` Oleg Cherkasov
2017-10-23 20:45 ` John Stoffel
2017-10-20 16:20 ` lejeczek
2017-10-20 16:48 ` Xen
2017-10-20 17:02 ` Bernd Eckenfels
2017-10-24 14:51 ` lejeczek
-- strict thread matches above, loose matches on Subject: below --
2017-10-19 10:05 Oleg Cherkasov
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