From: matthew patton <pattonme@yahoo.com>
To: Mike Snitzer <snitzer@redhat.com>,
Oleg Cherkasov <o1e9@member.fsf.org>,
LVM general discussion and development <linux-lvm@redhat.com>
Cc: ejt@redhat.com
Subject: Re: [linux-lvm] cache on SSD makes system unresponsive
Date: Sat, 21 Oct 2017 16:08:42 +0000 (UTC) [thread overview]
Message-ID: <1540708205.1077645.1508602122091@mail.yahoo.com> (raw)
In-Reply-To: 1540708205.1077645.1508602122091.ref@mail.yahoo.com
> But if it's something that only exhibits in writeback mode rather than writethrough, then I'd guess it's to do with the
> list of writeback work that the policy builds. So check
OP is being coy about the DD command but I saw it mentioned off-hand earlier.
dd if=/250GB_file/on_LVM/H800_vdev of=/dev/null
It's a pure, streaming read. LVM cache should be doing absolutely nothing.
next parent reply other threads:[~2017-10-21 16:08 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1540708205.1077645.1508602122091.ref@mail.yahoo.com>
2017-10-21 16:08 ` matthew patton [this message]
[not found] <640472762.2746512.1508882485777.ref@mail.yahoo.com>
2017-10-24 22:01 ` [linux-lvm] cache on SSD makes system unresponsive 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] <1244564108.1073508.1508601932111.ref@mail.yahoo.com>
2017-10-21 16:05 ` matthew patton
2017-10-24 18:09 ` Oleg Cherkasov
[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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