Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.debian.user > #204273
| Path | csiph.com!feeder.erje.net!2.eu.feeder.erje.net!border1.nntp.ams1.giganews.com!nntp.giganews.com!news.mixmin.net!aioe.org!bofh.it!news.nic.it!robomod |
|---|---|
| From | Pascal Hambourg <pascal@plouf.fr.eu.org> |
| Newsgroups | linux.debian.user |
| Subject | Re: SSD TRIM software raid (mdadm) |
| Date | Thu, 10 Jan 2019 01:00:01 +0100 |
| Message-ID | <xevVn-eX-11@gated-at.bofh.it> (permalink) |
| References | <xetAd-7lH-5@gated-at.bofh.it> |
| X-Original-To | debian-user@lists.debian.org |
| X-Mailbox-Line | From debian-user-request@lists.debian.org Wed Jan 9 23:52:04 2019 |
| Old-Return-Path | <pascal@plouf.fr.eu.org> |
| X-Amavis-Spam-Status | No, score=-6.9 tagged_above=-10000 required=5.3 tests=[BAYES_00=-2, FOURLA=0.1, LDO_WHITELIST=-5, RCVD_IN_DNSWL_NONE=-0.0001] autolearn=ham autolearn_force=no |
| User-Agent | Mozilla/5.0 (X11; Linux i686; rv:60.0) Gecko/20100101 Thunderbird/60.4.0 |
| MIME-Version | 1.0 |
| Content-Type | text/plain; charset=utf-8; format=flowed |
| Content-Language | en-US |
| Content-Transfer-Encoding | 8bit |
| X-Mailing-List | <debian-user@lists.debian.org> archive/latest/744245 |
| List-ID | <debian-user.lists.debian.org> |
| List-URL | <https://lists.debian.org/debian-user/> |
| List-Archive | https://lists.debian.org/msgid-search/d4f5feec-2f38-4b32-0845-99a6d1f59c03@plouf.fr.eu.org |
| Approved | robomod@news.nic.it |
| Lines | 27 |
| Organization | linux.* mail to news gateway |
| Sender | robomod@news.nic.it |
| X-Original-Date | Thu, 10 Jan 2019 00:51:50 +0100 |
| X-Original-Message-ID | <d4f5feec-2f38-4b32-0845-99a6d1f59c03@plouf.fr.eu.org> |
| X-Original-References | <ac584f57-2dec-e505-c44c-599d97a92ad8@unix-solution.de> |
| Xref | csiph.com linux.debian.user:204273 |
Show key headers only | View raw
Le 09/01/2019 à 22:22, basti a écrit : > I have create a software raid level 1 with mdadm. > > One drive is a "classic" HDD. > The 2'nd drive is a SSD with option "write-mostly". Why did you flag the SSD as write-mostly ? I would have expected the opposite. > Over the raid I have create and LVM with all the partitions (root,swap > and qemu/KVM VM's). > > When I understand mdadm the hole space is marked as used. I don't understand what you mean. > So my question is how useful is fstrim on /dev/mdx and would it relay > trim the SSD? RAID 1 supports TRIM since kernel 3.7. Since the HDD does not support TRIM, it will make discarded bloc contents inconsistent between the SSD and the HDD but it does not matter. However you wrote that the RAID device is used by LVM, so you cannot run fstrim on it directly. You must enable TRIM/discard in LVM (see lvm.conf) and run fstrim on LVs which contain mounted filesystems supporting TRIM/discard.
Back to linux.debian.user | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
SSD TRIM software raid (mdadm) basti <mailinglist@unix-solution.de> - 2019-01-09 22:30 +0100
Re: SSD TRIM software raid (mdadm) Pascal Hambourg <pascal@plouf.fr.eu.org> - 2019-01-10 01:00 +0100
Re: SSD TRIM software raid (mdadm) basti <mailinglist@unix-solution.de> - 2019-01-10 10:50 +0100
Re: SSD TRIM software raid (mdadm) David Christensen <dpchrist@holgerdanske.com> - 2019-01-10 03:50 +0100
csiph-web