I haven't used the striper, but it appears to make you specify sizes, stripe units, and stripe counts. I would expect you need to make sure that the size is an integer multiple of the stripe unit. And it probably defaults to a 4MB object if you don't specify one?
On Fri, Sep 29, 2017 at 2:09 AM Alexander Kushnirenko <kushnirenko@xxxxxxxxx> wrote:
Hi,_______________________________________________I'm trying to use CEPH-12.2.0 as storage for with Bareos-16.2.4 backup with libradosstriper1 support.Libradosstriber was suggested on this list to solve the problem, that current CEPH-12 discourages users from using object with very big size (>128MB). Bareos treat Rados Object as Volume and in CEPH-10 it created objects with very big size (10G and more). CEPH-10 allowed such behaviour, put recovery indeed take very long time. So stripping objects seems to be the right thing to do.Bareos supports libradosstriper and the code seems to work. But for some reason it run only with stripe_unit=4194304, which seems to be typical value for RadosGW for example. I tried several other values for stripe_unit, but the code exit with error.Is there a particular reason why only 4M size works? Can one use some CLI to test different stripe sizes?Basic flow of creating object in Bareos is the following:rados_ioctx_create(m_cluster, m_rados_poolname, &m_ctx);rados_striper_create(m_ctx, &m_striper);rados_striper_set_object_layout_stripe_unit(m_striper, m_stripe_unit);rados_striper_set_object_layout_stripe_count(m_striper, m_stripe_count);.....status = rados_striper_write(m_striper, m_virtual_filename, buffer, count, offset);Alexander
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