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cluster:151 [2016/10/31 17:04] hmeij07 [/mnt/beegfs/] |
cluster:151 [2016/11/22 18:46] hmeij07 [Resync Data #2] |
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* '' | * '' | ||
- | ==== Quota Enable | + | ==== Resync Data #2 ==== |
+ | |||
+ | If you have 2 buddymirrors | ||
+ | |||
+ | How does one add a server? | ||
+ | |||
+ | < | ||
+ | |||
+ | # define storage objects, 2 per server | ||
+ | [root@petaltail ~]# / | ||
+ | [root@petaltail ~]# / | ||
+ | [root@swallowtail data]# / | ||
+ | [root@swallowtail data]# / | ||
+ | |||
+ | |||
+ | [root@cottontail2 ~]# beegfs-df | ||
+ | METADATA SERVERS: | ||
+ | TargetID | ||
+ | ======== | ||
+ | | ||
+ | |||
+ | STORAGE TARGETS: | ||
+ | TargetID | ||
+ | ======== | ||
+ | | ||
+ | | ||
+ | | ||
+ | | ||
+ | |||
+ | # define mirrrogroups | ||
+ | [root@cottontail2 ~]# beegfs-ctl --addmirrorgroup --primary=21701 --secondary=13601 --groupid=1 | ||
+ | [root@cottontail2 ~]# beegfs-ctl --addmirrorgroup --primary=13602 --secondary=21702 --groupid=2 | ||
+ | |||
+ | [root@cottontail2 ~]# beegfs-ctl --listmirrorgroups | ||
+ | | ||
+ | | ||
+ | 1 | ||
+ | 2 | ||
+ | |||
+ | # define buddygroups, | ||
+ | [root@cottontail2 ~]# beegfs-ctl --setpattern --buddymirror / | ||
+ | New chunksize: 524288 | ||
+ | New number of storage targets: 1 | ||
+ | Path: /home1 | ||
+ | Mount: / | ||
+ | |||
+ | [root@cottontail2 ~]# beegfs-ctl --setpattern --buddymirror / | ||
+ | New chunksize: 524288 | ||
+ | New number of storage targets: 1 | ||
+ | Path: /home2 | ||
+ | Mount: / | ||
+ | |||
+ | # drop /home/hmeij in / | ||
+ | [root@petaltail mysql_bak_ptt]# | ||
+ | 3623 | ||
+ | [root@petaltail mysql_bak_ptt]# | ||
+ | 3678 | ||
+ | [root@swallowtail data]# find / | ||
+ | 3623 | ||
+ | [root@swallowtail data]# find / | ||
+ | 3678 | ||
+ | |||
+ | # redefine with numtargets=2, | ||
+ | # resync - no results | ||
+ | # dropping hmeij/ into home2/ yields same amount of files | ||
+ | |||
+ | # rebuild test servers with from scratch with numparts=2 | ||
+ | # drop hmeij/ inot home1/ and slightly more files (couple of 100s), not double the amount | ||
+ | |||
+ | Path: / | ||
+ | Mount: / | ||
+ | EntryID: 1B-5834626F-FA | ||
+ | Metadata node: cottontail2 [ID: 250] | ||
+ | Stripe pattern details: | ||
+ | + Type: Buddy Mirror | ||
+ | + Chunksize: 512K | ||
+ | + Number of storage targets: desired: 2; actual: 2 | ||
+ | + Storage mirror buddy groups: | ||
+ | + 2 | ||
+ | + 1 | ||
+ | |||
+ | |||
+ | </ | ||
+ | |||
+ | ==== Resync Data #1 ==== | ||
+ | |||
+ | [[http:// | ||
+ | |||
+ | //If the primary storage target of a buddy group is unreachable, | ||
+ | |||
+ | Testing out fail over and deletion of data on secondary then a full resync process: | ||
+ | |||
+ | |||
+ | * started a full --resyncstorage --mirrorgroupid=101 --timestamp=0 | ||
+ | * got --getentryinfo EntryID for a file in my / | ||
+ | * did a cat / | ||
+ | * brought primary storage down | ||
+ | * redid the cat above (it hangs for a couple of minutes, then displays the file content) | ||
+ | * while primary down, I ran rm -rf / | ||
+ | * a cat now generates the expected file not found error | ||
+ | * brought up primary and started a full --resyncstorage --mirrorgroupid=101 --timestamp=0 | ||
+ | * the nr of files and dirs discovered is as expected lower by the correct values | ||
+ | * when I now search for the EntryIDs obtained before they are gone from / | ||
+ | |||
+ | Nice that it works. | ||
+ | |||
+ | So you can full storage content mirror. You'll still need rsnapshots to recover lost data or point in time restores. | ||
+ | |||
+ | ==== Mirror Data ==== | ||
+ | |||
+ | When not all storage servers are up, client mounts will fail. This is just an optional " | ||
+ | |||
+ | In order to able able to take a storage server off line without any impact, all content needs to mirrored. | ||
+ | |||
+ | ** Before ** | ||
+ | |||
+ | < | ||
+ | [root@cottontail2 ~]# beegfs-df | ||
+ | METADATA SERVERS: | ||
+ | TargetID | ||
+ | ======== | ||
+ | 48 | ||
+ | 49 | ||
+ | | ||
+ | |||
+ | STORAGE TARGETS: | ||
+ | TargetID | ||
+ | ======== | ||
+ | | ||
+ | | ||
+ | </ | ||
+ | |||
+ | ** Before ** | ||
+ | |||
+ | < | ||
+ | |||
+ | # define buddygroup - these are storage target IDs | ||
+ | [root@n7 ~]# beegfs-ctl --addmirrorgroup --primary=13601 --secondary=21701 --groupid=101 | ||
+ | Mirror buddy group successfully set: groupID 101 -> target IDs 13601, 21701 | ||
+ | |||
+ | [root@n7 ~]# beegfs-ctl --listmirrorgroups | ||
+ | | ||
+ | | ||
+ | 101 | ||
+ | |||
+ | # enable mirroring for data by directory -numTargets needs to be set to max nr of storage servers? | ||
+ | # changed to 11/ | ||
+ | [root@n7 ~]# beegfs-ctl --setpattern --buddymirror / | ||
+ | [root@n7 ~]# beegfs-ctl --setpattern --buddymirror / | ||
+ | New chunksize: 524288 | ||
+ | New number of storage targets: 2 | ||
+ | Path: / | ||
+ | Mount: / | ||
+ | |||
+ | # copy some contents in (~hmeij is 10G) | ||
+ | [root@n7 ~]# rsync -vac --bwlimit /home/hmeij / | ||
+ | |||
+ | </ | ||
+ | |||
+ | ** After ** | ||
+ | |||
+ | < | ||
+ | |||
+ | [root@n7 ~]# beegfs-df | ||
+ | |||
+ | METADATA SERVERS: (almost no changes...) | ||
+ | STORAGE TARGETS: (each target less circa 10G) | ||
+ | TargetID | ||
+ | ======== | ||
+ | | ||
+ | | ||
+ | |||
+ | # lets find an object | ||
+ | [root@n7 ~]# beegfs-ctl --getentryinfo / | ||
+ | Path: / | ||
+ | Mount: / | ||
+ | EntryID: 178-581797C8-30 | ||
+ | Metadata node: n38 [ID: 48] | ||
+ | Stripe pattern details: | ||
+ | + Type: Buddy Mirror | ||
+ | + Chunksize: 512K | ||
+ | + Number of storage targets: desired: 2; actual: 1 | ||
+ | + Storage mirror buddy groups: | ||
+ | + 101 | ||
+ | |||
+ | # original | ||
+ | [root@n7 ~]# ls -lh / | ||
+ | -rwxr-xr-x 1 hmeij its 4.9G 2014-04-07 13:39 / | ||
+ | |||
+ | # copy on primary | ||
+ | [root@petaltail chroots]# ls -lh / | ||
+ | -rw-rw-rw- 1 root root 4.9G Apr 7 2014 / | ||
+ | ^^^^^^^^ | ||
+ | |||
+ | # copy on secondary | ||
+ | [root@swallowtail ~]# find / | ||
+ | / | ||
+ | [root@swallowtail ~]# ls -lh / | ||
+ | -rw-rw-rw- 1 root root 4.9G Apr 7 2014 / | ||
+ | ^^^^^^^^ | ||
+ | |||
+ | # seems to work, notice the '' | ||
+ | |||
+ | </ | ||
+ | |||
+ | Here is an important note, from community list: | ||
+ | |||
+ | * " | ||
+ | * so the important line that tells you that this file is mirrored is "Type: Buddy Mirror" | ||
+ | * " | ||
+ | |||
+ | Another note: I changed paths for mirrormd and buddymirror to ''/ | ||
+ | |||
+ | < | ||
+ | |||
+ | [root@cottontail2 ~]# beegfs-net | ||
+ | meta_nodes | ||
+ | ============= | ||
+ | cottontail2 [ID: 250] | ||
+ | | ||
+ | |||
+ | [root@cottontail2 ~]# beegfs-ctl --listnodes --nodetype=meta --details | ||
+ | cottontail2 [ID: 250] | ||
+ | | ||
+ | | ||
+ | ^^^ | ||
+ | |||
+ | </ | ||
+ | |||
+ | ==== Quota ==== | ||
* [[http:// | * [[http:// | ||
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* do BEFORE populating XFS file systems | * do BEFORE populating XFS file systems | ||
+ | ==== Meta Backup/ | ||
+ | |||
+ | [[http:// | ||
+ | |||
+ | < | ||
+ | |||
+ | # latest tar | ||
+ | rpm -Uvh / | ||
+ | |||
+ | # backup | ||
+ | cd /data; tar czvf / | ||
+ | |||
+ | # restore | ||
+ | cd / | ||
+ | |||
+ | # test | ||
+ | cd /data; diff -r beegfs_meta beegfs_meta.orig | ||
+ | # no results | ||
+ | |||
+ | </ | ||
+ | |||
+ | |||
+ | |||
+ | ==== Resync Meta ==== | ||
+ | |||
+ | [[http:// | ||
+ | |||
+ | * older versions | ||
+ | * new future version will work like storage mirror with HA and self-healing | ||
==== Mirror Meta ==== | ==== Mirror Meta ==== | ||
+ | |||
+ | //Metadata mirroring can currently not be disabled after it has been enabled for a certain directory// | ||
Definitely want Meta content mirrored, that way I can use the n38-n45 nodes with local 15K disk, plus maybe cottontail2 (raid 1 with hot and cold spare). | Definitely want Meta content mirrored, that way I can use the n38-n45 nodes with local 15K disk, plus maybe cottontail2 (raid 1 with hot and cold spare). | ||
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# enable meta mirroring, directory based | # enable meta mirroring, directory based | ||
+ | # change to 11/04/2016: used --createdir to make this home. | ||
+ | [root@n7 ~]# beegfs-ctl --mirrormd / | ||
[root@n7 ~]# beegfs-ctl --mirrormd / | [root@n7 ~]# beegfs-ctl --mirrormd / | ||
Mount: '/ | Mount: '/ | ||
Line 62: | Line 323: | ||
[root@sharptail ~]# ssh n38 find / | [root@sharptail ~]# ssh n38 find / | ||
/ | / | ||
- | ^^^^^^ | + | |
# and find | # and find | ||
[root@sharptail ~]# ssh n39 find / | [root@sharptail ~]# ssh n39 find / | ||
Line 139: | Line 400: | ||
* set in / | * set in / | ||
- | * backup | + | * backup/restore/mirror |
- | * attempt a restore | + | * see more towards top this page |
- | * or just snapshot | + | |
* storage server tuning | * storage server tuning |