When I create a file on my lustre FS, add acl and a test xattr named "attr1", with the standard tools "attr", there is 2 xattr
santos.root(55) [dev->Bin] attr -l /mnt/mycltlustre/hky/bck/file.txt Attribute "lov" has a 56 byte value for /mnt/mycltlustre/hky/bck/file.txt Attribute "attr1" has a 4 byte value for /mnt/mycltlustre/hky/bck/file.txtwith an own developped tools, there is I can see 2 lustre xattr, trusted.lov and lustre.lov
santos.root(56) [dev->Bin] tina_xattr -tst_num 1 -path_src /mnt/mycltlustre/hky/bck/file.txt
I "Vos:tst_stat"[3]Stat Posix "/mnt/mycltlustre/hky/bck/file.txt" I "Vos:tst_stat"[9] I "Vos:tst_stat"[9]xattr list size: 58 I "Vos:tst_stat"[9] I "Vos:tst_stat"[9]xattr name[0] = trusted.lov I "Vos:tst_stat"[11] size: 56 I "Vos:tst_stat"[9]xattr name[1] = system.posix_acl_access I "Vos:tst_stat"[11] size: 44 I "Vos:tst_stat"[9]xattr name[2] = user.attr1 I "Vos:tst_stat"[11] size: 4 I "Vos:tst_stat"[9]xattr name[3] = lustre.lov I "Vos:tst_stat"[11] size: 56I see some informations on backup where extended attributes are supposed to be backuped and restored
https://bugzilla.lustre.org/show_bug.cgi?id=5716 or in the lustre - operation manual (chapter 15)
But I would like to get more informations about theses two extended attributes. Which role they have (store lustre splitting information, I could imagine), do we need really to backup them ? and restore them ?
They should be recreated as restoring a file, it's recreating a file ??Or perhaps it's linked with the MDS backup, in case of full desaster / recovery.
my lustre config santos.root(57) [dev->Bin] uname -aLinux santos 2.6.18-128.7.1.el5_lustre.1.8.1.1 #1 SMP Tue Oct 6 05:48:57 MDT 2009 x86_64 x86_64 x86_64 GNU/Linux
santos root(58) [dev->Bin] rpm -qa | grep lustre lustre-modules-1.8.1.1-2.6.18_128.7.1.el5_lustre.1.8.1.1 lustre-1.8.1.1-2.6.18_128.7.1.el5_lustre.1.8.1.1 kernel-ib-1.4.2-2.6.18_128.7.1.el5_lustre.1.8.1.1 kernel-lustre-2.6.18-128.7.1.el5_lustre.1.8.1.1 lustre-ldiskfs-3.0.9-2.6.18_128.7.1.el5_lustre.1.8.1.1 Thanks Hervé
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